EM2420-RTB Ember, EM2420-RTB Datasheet

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EM2420-RTB

Manufacturer Part Number
EM2420-RTB
Description
IC RF TXRX ZIGBEE 2.4GHZ 48-QLP
Manufacturer
Ember
Datasheet

Specifications of EM2420-RTB

Mfg Application Notes
EM2420
Frequency
2.4GHz
Data Rate - Maximum
250kbps
Modulation Or Protocol
802.15.4
Applications
Home/Building Automation, ZigBee™
Power - Output
-3dBm
Sensitivity
-94dBm
Voltage - Supply
2.1 V ~ 3.6 V
Current - Receiving
19.7mA
Current - Transmitting
17.4mA
Data Interface
PCB, Surface Mount
Antenna Connector
PCB, Surface Mount
Operating Temperature
-40°C ~ 85°C
Package / Case
48-QLP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Memory Size
-
EM2420
2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver
Applications
Product Description
The
IEEE 802.15.4 compliant RF transceiver
designed for low-power and low-voltage
wireless applications. The
a digital direct sequence spread spectrum
baseband
spreading gain of 9 dB and an effective
data rate of 250 kbps. The EM2420 chip is
only available from Ember with a licensed
Ember networking stack and is targeted to
approved 8-bit processors.
The
solution for robust wireless communication
in the 2.4 GHz unlicensed ISM band. It
complies
covered by ETSI EN 300 328 and EN 300
440 class 2 (Europe), FCC CFR47 Part 15
(US) and ARIB STD-T66 (Japan).
The
support
buffering,
encryption,
channel assessment, link quality indication
Key Features
Ember Part Number: 120-0049-000D
2.4 GHz IEEE 802.15.4 systems
ZigBee systems
Home/building automation
Industrial control
True
802.15.4 compliant RF transceiver
with baseband modem, MAC support,
and networking stack.
DSSS
MChips/s and 250 kbps effective data
rate.
Suitable for both RFD and FFD
operation
Low current consumption (RX: 19.7
mA, TX: 17.4 mA)
Low supply voltage (2.1 – 3.6 V) with
integrated voltage regulator
Low supply voltage (1.6 – 2.0 V) with
external voltage regulator
EM2420
EM2420
EM2420
for
single-chip
with
is a low-cost, highly integrated
burst
baseband
is a true single-chip 2.4 GHz
modem
provides extensive hardware
data
packet
worldwide
authentication,
transmissions,
that
2.4
modem
handling,
EM2420
provides
GHz
regulations
includes
with
IEEE
clear
data
data
EM2420 Datasheet
a
2
and packet timing information. These
features reduce the load on the host
controller
interface low-cost microcontrollers.
The configuration interface and transmit /
receive FIFOs of the
via
application the
together with a microcontroller and a few
external passive components.
The
CMOS process.
Wireless sensor networks
PC peripherals
Consumer electronics
Programmable output power
No external RF switch / filter needed
I/Q low-IF receiver
I/Q direct upconversion transmitter
Very few external components
128(RX) + 128(TX) byte data buffering
Digital RSSI / LQI support
Hardware MAC encryption (AES-128)
Battery monitor
QLP-48 package, 7x7 mm
Complies with ETSI EN 300 328, EN
300 440 class 2, FCC CFR-47 part 15
and ARIB STD-T66
Powerful and flexible development
tools available
EM2420
an
SPI
and
is manufactured to a 0.18 µm
interface.
allow
EM2420
EM2420
EM2420
the
will be used
In
are accessed
EM2420
Page 1 of 84
a
typical
to

Related parts for EM2420-RTB

EM2420-RTB Summary of contents

Page 1

... The EM2420 chip is only available from Ember with a licensed Ember networking stack and is targeted to approved 8-bit processors. EM2420 The is a low-cost, highly integrated solution for robust wireless communication in the 2 ...

Page 2

... Buffered transmit mode___________________________________________________________35 Buffered receive mode ___________________________________________________________36 Un-buffered, serial mode__________________________________________________________36 Address Recognition ______________________________________________________________37 Acknowledge Frames _____________________________________________________________38 Radio control state machine ________________________________________________________40 MAC Security Operations (Encryption and Authentication) _____________________________42 Keys__________________________________________________________________________42 Nonce / counter _________________________________________________________________42 Stand-alone encryption ___________________________________________________________43 Ember Part Number: 120-0049-000D EM2420 Datasheet EM2420 Page ...

Page 3

... Package thermal properties ________________________________________________________81 Soldering information ____________________________________________________________81 Plastic tube specification __________________________________________________________81 Carrier tape and reel specification ___________________________________________________82 Ordering Information _____________________________________________________________82 General Information ______________________________________________________________83 Product Status Definitions_________________________________________________________83 Life Support Policy ______________________________________________________________83 Address Information ______________________________________________________________84 Ember Part Number: 120-0049-000D EM2420 Datasheet EM2420 Page ...

Page 4

... PHY Header PLL - Phase Locked Loop PSDU - PHY Service Data Unit QLP - Quad Leadless Package RAM - Random Access Memory RBW - Resolution Bandwidth RF - Radio Frequency RSSI - Receive Signal Strength Indicator RX - Receive SHR - Synchronization Header Ember Part Number: 120-0049-000D EM2420 Datasheet EM2420 Page ...

Page 5

... Information Processing Standards Publication 197, US Department of Commerce/N.I.S.T., November 26, 2001. Available from the NIST website. http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf [3] R. Housley, D. Whiting, N. Ferguson, Counter with CBC-MAC (CCM), submitted to NIST, June 3, 2002. Available from the NIST website. http://csrc.nist.gov/CryptoToolkit/modes/proposedmodes/ProposedModesPa ge.html Ember Part Number: 120-0049-000D EM2420 Datasheet EM2420 Page ...

Page 6

... EmberNet Stack is accessible though a powerful API. • Small size QLP-48 package word • Complies with EN 300 328, EN 300 440 class 2, FCC CFR47 part 15 and and ARIB STD-T66 EM2420 Datasheet EM2420 MAC security security operations environment and themselves with Management Stack, a self- ...

Page 7

... Condition 2.1 3.6 V 1.6 3.6 V The digital I/O voltage (DVDD3.3 pin) must match the external interfacing circuit (e.g., microcontroller). 1.6 1.8 2.0 V The typical application uses regulated 1.8 V supply generated by the on-chip voltage regulator. −40 85 °C EM2420 Datasheet EM2420 Condition Page ...

Page 8

... Electrical Specifications Measured on EM2420 Evaluation Module °C, regulator used if nothing else stated. Parameter Min. Overall RF Frequency Range 2400 Transmit Section Transmit bit rate 250 Transmit chip rate 2000 Nominal output power -3 Programmable output power range Harmonics nd 2 harmonic rd 3 harmonic Spurious emission 30 - 1000 MHz 1– ...

Page 9

... ARIB STD-T-66 300 kHz Difference between center frequency of the received RF signal and local oscillator frequency [1] requires 200 kHz 120 ppm Difference between incoming symbol rate and the internally generated symbol rate [1] requires 80 ppm − 77 dBm Programmable in RSSI.CCA_THR EM2420 Datasheet EM2420 Page ...

Page 10

... At ±3 MHz offset from carrier −117 dBc/Hz At ±5 MHz offset from carrier 50 kHz 192 µs The startup time from the crystal oscillator is running and turnaround time Signal levels are referred to the voltage level at pin DVDD3.3 0.3* V DVDD EM2420 Datasheet EM2420 Page ...

Page 11

... FIFO must be ready before the positive edge of FIFOP ns TX un-buffered mode, minimum time FIFO must be held after the positive edge of FIFOP See Table 4 on page 24. Note that the internal voltage regulator EM2420 and no external circuitry. 3.0 3 the VREG_IN pin 1.8 1 the VREG_OUT pin µ ...

Page 12

... Voltage regulator off 20 µA Voltage regulator on 426 Including crystal oscillator and µA voltage regulator 19.7 mA 8.5 mA The output power is delivered 9.9 mA differentially Ω single ended load through a balun, see 14 mA also page 51. 17.4 mA EM2420 Datasheet EM2420 Page ...

Page 13

... Negative RF input/output signal to LNA/from PA in receive/transmit mode Grounded pin for RF shielding 1.8 V Power supply for LNA / PA switch Not Connect Not Connect Not Connect 1.8 V Power supply for receive and transmit mixers EM2420 Datasheet EM2420 NC DVDD_RAM SO SI SCLK CSn FIFO FIFOP ...

Page 14

... V Power supply for transmit / receive IF chain External precision resistor, 43 kΩ, ± Analog test I/O for prototype and production testing Analog test I/O for prototype and production testing 1.8 V Power supply for phase detector and charge pump EM2420 Datasheet EM2420 Page ...

Page 15

... The biasing of the PA and LNA is done by connecting TXRX_SWITCH to RF_P and RF_N through an external DC path. test The frequency synthesizer includes a completely on-chip LC VCO and a 90 degrees phase splitter for generating the I EM2420 Datasheet EM2420 Serial voltage regulator Digital and Analog test interface ...

Page 16

... An on-chip voltage regulator delivers the regulated 1.8 V supply voltage. The voltage regulator may be enabled / disabled through a separate pin. to and A battery monitor may optionally be used to monitor the unregulated power supply voltage. The battery configurable through the SPI interface. EM2420 Datasheet EM2420 monitor is Page ...

Page 17

... The placement and size of the decoupling capacitors and the power supply filtering are very important to achieve the best pins, performance in an application. Ember provides a compact reference design that should be followed very closely. EM2420 Datasheet EM2420 provided without Page ...

Page 18

... Figure 3. Typical application circuit with discrete balun for single-ended operation Ember Part Number: 120-0049-000D 3.3 V Power supply C391 C381 R451 C42 XTAL VCO_GUARD AVDD_VCO AVDD_PRE AVDD_RF1 GND QLP48 RF_P 7x7 TXRX_SWITCH RF_N GND AVDD_SW NC NC EM2420 Datasheet EM2420 36 NC DVDD_RAM SCLK 31 CSn FIFO 30 29 FIFOP 28 CCA 27 SFD 26 DVDD1.8 25 DVDD3 ...

Page 19

... TXRX_SWITCH antenna 8 RF_N 9 GND 10 AVDD_SW Figure 4. Typical application circuit with differential antenna (folded dipole) Ember Part Number: 120-0049-000D 3.3 V Power supply C391 C381 R451 C42 XTAL DVDD_RAM SCLK QLP48 CSn 7x7 FIFO FIFOP CCA SFD DVDD1.8 DVDD3.3 EM2420 Datasheet EM2420 Page ...

Page 20

... ESR < 5Ω Not used Not used 5.6 pF, 10%, X5R, 0402 Not used 27 pF, 5%, NP0, 0402 27 pF, 5%, NP0, 0402 27 nH, 5%, Monolithic/multilayer, 0402 Not used Not used 43 kΩ, 1%, 0402 ), 16 MHz crystal load (C L ESR < 60 Ω EM2420 Datasheet EM2420 ), L Page ...

Page 21

... Symbol- O-QPSK Modulated to-Chip Modulator , … – is shaped as a half-sine, transmitted alternately in the I and Q channels with one half chip period offset. This is illustrated for the zero-symbol in Figure 6. EM2420 Datasheet EM2420 32 chips ) transmitted first 0 Signal Page ...

Page 22

... Receive / transmit mode • RF channel selection • RF output power Ember Part Number: 120-0049-000D • Power-down / power-up mode • Crystal oscillator power-up / power- down • Clear Channel Assessment mode • Packet handling hardware support • Encryption / Authentication modes EM2420 Datasheet EM2420 0.5 µs C Page ...

Page 23

... SPI access section on page 27. The register data will be retained during power down mode, but not when the power-supply is turned off (e.g., by disabling the voltage regulator using the VREG_EN pin). The registers can be programmed in any order. EM2420 Datasheet EM2420 input by the Page ...

Page 24

... The maximum rise time for SCLK and CSn ns The maximum fall time for SCLK and CSn pin. The status byte contains 6 status bits which are described in Table 5. Issuing a SNOP (no operation) command strobe may be used to read the status byte. It may also be read during access to EM2420 Datasheet EM2420 ...

Page 25

... The crystal oscillator must be running when accessing the RAM. The RAM/Register bit must be set high to enable RAM access. The 9 bit RAM EM2420 Datasheet EM2420 hardware for Page ...

Page 26

... DATA DATA DATA DATA ... FIFO byte0 byte1 byte2 byte3 ADDRH DATA DATA DATA ... RAM RAM ADDR ADDR+1 ADDR+2 EM2420 Datasheet EM2420 ... ADDR ADDR ADDR DATA DATA 8MSB 8LSB DATA DATA DATA byte n-3 byte n-2 byte n-1 DATA ADDR+n Page ...

Page 27

... CSn high. For example, the user may issue a command strobe, a register write and writing 3 bytes to the TXFIFO in one operation, as illustrated in Figure 9. The only exception is that FIFO and RAM access must be terminated by setting CSn high. EM2420 Datasheet EM2420 and Pin TXFIFO has its ...

Page 28

... SI and SCLK should be set to a defined level to prevent the inputs from floating. For a more complete example, please refer to Ember’s EM2420 Reference Design on the (www.ember.com). EM2420 Datasheet ...

Page 29

... RXFIFO before the address is completely received, since the frame may be automatically flushed by the EM2420 if it fails address recognition. This may be handled by using the FIFOP pin, since this pin does not go high until the frame passes address recognition ...

Page 30

... RXFIFO. SFD Length MAC Protocol Data Unit (MPDU) with correct address SFD Length MAC Protocol Data Unit (MPDU) with wrong address - - - - PSDU1 PSDU2 PSDU3 PSDU5 PSDU4 EM2420 Datasheet EM2420 If the also protects the used EM2420 , this bit - - - ...

Page 31

... Soft decision is used at the chip level, i.e., the demodulator does not make a decision for each chip, only for each received symbol. De-spreading is performed using over sampled symbol correlators. Symbol synchronization is continuous start of frame delimiter (SFD) search. EM2420 Datasheet EM2420 CRC generated CC2420 by preferably be EM2420 demodulator ...

Page 32

... PHY Protocol Data Unit (PPDU) defined bytes of 0x00. The SFD is one byte, set to 0xA7. (SHR) EM2420 In the , the preamble length and SFD is configurable. The default values are compliant with [1]. Changing these EM2420 Datasheet EM2420 is performed Symbol Data Correlators and Symbol Synchronisation Output ...

Page 33

... Check transmission and reception, so this field inserted must always be implementing a proprietary (non 802.15-4) system. In transmit mode, the length field is used for underflow detection, as described in the FIFO access section on page 27. EM2420 Datasheet EM2420 synchronizes to defined by the zero-symbol for EM2420 uses the for ...

Page 34

... LQI. See the Link Quality Indication section on page 46 for details. The most significant bit in the last byte of each frame is set high if the CRC of the received frame is otherwise. EM2420 Datasheet EM2420 12-13 14-15 Reserved Source addressing mode by the ...

Page 35

... See the Radio control state machine section on page 40 for an illustration of how the transmit command strobes affect and EM2420 the state of the bits. strobe is ignored if the channel is busy. See , while test EM2420 Datasheet EM2420 r12 r13 r14 r15 RSSI CRC / Corr n-2 (signed) 5 ...

Page 36

... In serial receive (MDMCTRL1.RX_MODE=1) synchronization is still performed by the EM2420 . This means that the FIFOP clock pin will remain idle low until a start of frame delimiter has been detected. EM2420 Datasheet EM2420 mode a will remain in mode byte Page ...

Page 37

... RESERVED_FRAME_MODE control bit in MDMCTRL0 is set. In this case, no further address recognition is performed on these frames. This option is included for future expansions of the standard. match If a frame is rejected, the start searching for a new frame after the EM2420 Datasheet EM2420 s2 b10 b11 b8 b9 b10 b11 ...

Page 38

... AUTOACK. The pending flag will then be set for future acknowledge frames, command strobe is issued. Acknowledge frames may be manually transmitted using transmission if desired. EM2420 Datasheet EM2420 are also 1 2 Data Frame Check Sequence Number (FCS) MAC Footer ...

Page 39

... Beacon network 12 symbol periods <= Non-beacon network Figure 22. Acknowledge frame timing Ember Part Number: 120-0049-000D PPDU Acknowledge 12 symbol periods t < 32 symbol periods ack PPDU Acknowledge symbol periods ack EM2420 Datasheet EM2420 Page ...

Page 40

... Down until a transmission session is requested. As also described in the 4-wire Serial Configuration and Data Interface section on page 23, the crystal oscillator must be running (IDLE mode) in order to have access to the RAM and FIFOs. EM2420 Datasheet EM2420 the frequency is in Power Down can remain in Power Page ...

Page 41

... Wait for the specified crystal oscillator start-up time, or poll the XOSC16M_STABLE status bit IDLE [1] TX_CALIBRATE [32] TX_PREAMBLE [34, 35 and 36] TX_FRAME [37, 38 and 39] [48] Acknowledge completed EM2420 Datasheet EM2420 VREG_EN set low All RX states symbol periods later Preamble and SFD is transmitted TXFIFO Data is transmitted Page ...

Page 42

... I.e., the block counter part of the nonce does not need to be rewritten. in the EM2420 The block counter should be set to and 0x0001 for compliance with [1]. EM2420 Datasheet EM2420 an Elliptic Curve also use pre- e.g., for ...

Page 43

... EM2420 The gives the user full flexibility in selecting the flags for both nonces. The flag setting is stored in the most significant byte of the nonce. The flag byte used for encryption and authentication is then generated as shown in Figure 24. MSB in EM2420 nonce RAM CTR Flag ...

Page 44

... CCM combines CTR mode encryption and CBC-MAC authentication in one operation. CCM is described in [3]. SECCTRL1.SEC_TXL / SEC_RXL sets the number of bytes after the length field to be authenticated but not encrypted. The MIC is generated and verified very much like CBC-MAC, described above. EM2420 Datasheet EM2420 authentication is hardware. Page ...

Page 45

... A typical plot of the RSSI_VAL reading as function of input power is shown in Figure 25. It can be seen from the figure that the RSSI reading from the linear and has a dynamic range of about 100 dB. EM2420 Datasheet EM2420 is found EM2420 is very Page ...

Page 46

... LQI = (CORR – a) · b limited to the range 0-255, where a and b are found empirically, based on PER measurements as a function of the correlation value. A combination of RSSI and correlation values may also be used to generate the LQI value. EM2420 Datasheet EM2420 the Frame check ...

Page 47

... CCA. set by IEEE 802.15.4 specifies 16 channels within the 2.4 GHz band, numbered 11 The through 26. The RF frequency of channel k is given by [ 2405 + 5 (k-11) MHz, k=11, 12, ..., 26 C For operation FSCTRL.FREQ register should therefore be set to: . The C FSCTRL.FREQ = 357 + 5 (k-11) EM2420 Datasheet EM2420 in channel k, the Page ...

Page 48

... The regulated 1.8 V voltage output is available on the power simplified schematic regulator is shown in Figure 26. The voltage regulator requires external components as Application Circuit section on page 17. When disabling the voltage regulator, note that register and RAM programming will EM2420 Datasheet EM2420 pin. A VREG_OUT of the voltage described in the Page ...

Page 49

... VREG_IN to ground. VREG_OUT shall be left open. Note that the battery monitor will not work when the voltage regulator is not used. VREG_EN VREG_IN Regulator Enable / disable 1.25 V VREG_OUT programmable threshold. schematic of the battery monitor is shown in Figure 27. EM2420 Datasheet EM2420 A simplified Page ...

Page 50

... XOSC16_Q2 should be left open. The MAIN.XOSC16M_BYPASS bit must be set when an external clock signal is used. other Using the internal crystal oscillator, the crystal must be connected between the XOSC16_Q1 and XOSC16_Q2 pins. The oscillator is designed for parallel mode EM2420 Datasheet EM2420 should be set V toggle ⋅ ...

Page 51

... Using a differential antenna, no balun is required single-ended output is required (for a single-ended connector or a single ended antenna), a balun should be used for optimum performance. The balun can be realized using discrete inductors and capacitors LTCC balun can be used. EM2420 Datasheet EM2420 are given in Table is amplitude Page ...

Page 52

... Ember Part Number: 120-0049-000D unmodulated carrier will then be available on the RF output pins. A plot of the single carrier output spectrum EM2420 from the is shown in Figure 29 below. be setting RBW 10 kHz RF Att VBW 10 kHz SWT 50 ms Unit 200 kHz/ EM2420 Datasheet EM2420 30 dB dBm A 1SA Span 2 MHz Page ...

Page 53

... Figure 30. Note that to find the output power from the modulated spectrum, the RBW must be set to 3 MHz or higher. RBW 100 kHz RF Att VBW 100 kHz SWT 5 ms Unit 1 MHz/ EM2420 Datasheet EM2420 requires symbol not only bit the true RF and set EM2420 ...

Page 54

... Security operations require processing, which is costly in a 8-bit microcontroller system. The hardware may be support within the level of security, even with a low-cost 8 bit controller. EM2420 Datasheet EM2420 EM2420 allows and blocking performance is encryption and EM2420 a ...

Page 55

... The used to buffer data received during PER measurements, since it is able to buffer up to 128 bytes. • The control register should be set to 20, as Demodulator, may Synchronizer and Data Decision section. EM2420 Datasheet EM2420 to re-gain system, all performing PER instead of BER to evaluate the ...

Page 56

... Layer 2 has not been used in our EM2420 reference designs. Layer 3 is used for power routing and the bottom layer serve as ground plane with a little routing. The area under the chip is used for grounding and must be well connected to the ground plane with several vias ...

Page 57

... The differential antenna is recommended for low-power applications. It has the best range and is simple. The antenna should be connected as close as possible to the IC. If the antenna is located away from the RF pins, the antenna should be matched to the feeding transmission line (50 Ω). EM2420 Datasheet EM2420 Page ...

Page 58

... SFLUSHRX command strobe Flush the TX FIFO buffer Send acknowledge frame, with pending field cleared. Send acknowledge frame, with pending field set. Start RXFIFO in-line decryption / authentication (as set by SPI_SEC_MODE) Start TXFIFO in-line encryption / authentication (as set by SPI_SEC_MODE), without starting TX. EM2420 Datasheet EM2420 the Page ...

Page 59

... Receiver Bandpass Filter Test Register Finite State Machine State Status Register ADC Test Register DAC Test Register Top Level Test Register Reserved for future use control / status register Not used Transmit FIFO Byte Register Receiver FIFO Byte Register EM2420 Datasheet EM2420 Page ...

Page 60

... R/W Active low reset of the frequency synthesizer module. (Test purposes only Reserved, write R/W Bypasses the crystal oscillator and uses a buffered version of the signal on Q1 directly. This can be used to apply an external rail- rail clock signal to the Q1 pin. EM2420 Datasheet EM2420 Page ...

Page 61

... IEEE 802.15.4, since the 4 byte is included in the SYNCWORD leading zero bytes (not recommended leading zero bytes (not recommended leading zero bytes (IEEE 802.15.4 compliant leading zero bytes … leading zero bytes EM2420 Datasheet EM2420 MDMCTRL0.ADR_DECODE = 1 ). MDMCTRL0.ADR_DECODE = RESERVED_FRAME_MODE is don’t th ...

Page 62

... The RSSI_VAL value is averaged over 8 symbol periods. The RSSI_VALID status bit may be checked to verify that the receiver has been enabled for at least 8 symbol periods. The reset value of –128 also indicates that the RSSI_VAL value is invalid. EM2420 Datasheet EM2420 Page ...

Page 63

... Transmit mixers current R/W Current programming of the current adjustment 1: -2 current adjustment 2: -1 current adjustment 3: Nominal setting 4: +1 current adjustment 5: +2 current adjustment 6: +3 current adjustment 7: +4 current adjustment 1 W1 Reserved, write R/W Output PA level. (~0 dBm) EM2420 Datasheet EM2420 Page ...

Page 64

... LNA current (x2) 1: 480 µA LNA current (x2) 2: 640 µA LNA current (x2) 3: 1280 µA LNA current (x2) 1 R/W Controls main current in the LNA in AGC Med gain mode 1 R/W Controls main current in the LNA in AGC Low gain mode EM2420 Datasheet EM2420 Page ...

Page 65

... R/W Controls current in the mixer 0: 360 µA mixer current (x2) 1: 720 µA mixer current (x2) 2: 900 µA mixer current (x2) (Nominal) 3: 1260 µA mixer current (x2) EM2420 Datasheet EM2420 Page ...

Page 66

... Frequency control word, controlling the RF operating frequency transmit mode, the local oscillator (LO) frequency equals receive mode, the LO frequency is 2 MHz below F C (2405 F = 2048 + FREQ[9:0] MHz MHz) C See the Frequency and Channel Programming section on page 47 for further information. EM2420 Datasheet EM2420 . C Page ...

Page 67

... Reserved, write R/W Protection enable of the RXFIFO, see description in the RXFIFO overflow section on page 29. Should be cleared if MAC level security is not used or is implemented outside the EM2420. 1 R/W Defines what to use for the first byte in CBC-MAC (does not apply to CBC-MAC part of CCM): ...

Page 68

... BATTMON_EN has been asserted and BATTMON_VOLTAGE has been programmed Power supply < Toggle Voltage 1 : Power supply > Toggle Voltage 0 R/W Battery monitor enable 0 : Battery monitor is disabled 1 : Battery monitor is enabled 0 R/W Battery monitor toggle voltage. The toggle voltage is given by: − 72 BATTMON_VO V = ⋅ toggle EM2420 Datasheet EM2420 LTAGE 27 Page ...

Page 69

... R/W Accept all beacon frames when address recognition is enabled. This bit should be set when the PAN identifier programmed into the EM2420 RAM is equal to 0xFFFF and cleared otherwise. This bit is don't care when MDMCTRL0.ADR_DECODE = Only accept beacons with a source PAN identifier which ...

Page 70

... Reset R/W Description 2 R Version number. Current version The device part number. The EM2420 has part number 0x002. Reset R/W Description 3 R/W The time steps between the time the RX chain is enabled and the demodulator and AGC is enabled. The RX chain is started when the bandpass filter has been calibrated (after 6.5 symbol periods) ...

Page 71

... Powerdown control of charge pump. 1 R/W Powerdown control of VCO, I/Q generator, LO buffers. 1 R/W Powerdown control of the ADCs. 1 R/W Powerdown control of the VGA. 1 R/W Powerdown control of complex bandpass receive filter. 1 R/W Powerdown control of LNA, down-conversion mixers and frontend bias. EM2420 Datasheet EM2420 Page ...

Page 72

... AGC or overridden by the LNAMIX_GAINMODE_O setting. Reset R/W Description 3 R/W Hysteresis on the switching between different RF frontend gain modes, defined steps 25 R/W Threshold for switching between medium and high RF frontend gain mode, defined steps 9 R/W Threshold for switching between low and medium RF frontend EM2420 Datasheet EM2420 Page ...

Page 73

... LNA/MIXER gain from medium gain mode to high gain mode, used by the AGC for setting the correct frontend gain mode. 10 R/W LOW2MEDGAIN sets the difference in the receiver LNA/MIXER gain from low gain mode to medium gain mode, used by the AGC for setting the correct frontend gain mode. EM2420 Datasheet EM2420 Page ...

Page 74

... Reset R/W Description 0 W0 Reserved, write R/W VCO current calibration speed: 0: Normal 1: Double speed 2: Half speed 3: Undefined. 0 R/W VCO current manual override enable. 24 R/W VCO current override value (current A The resulting VCO current setting from last calibration. EM2420 Datasheet EM2420 Page ...

Page 75

... Second smallest capacitance setting. … 127: Maximum capacitance in the feedback. Reset R/W Description 0 W0 Reserved, write Gives the current state of the FIFO and Frame Control (FFCTRL) finite state machine. See the Radio control state machine section on page 40 for details. EM2420 Datasheet EM2420 Page ...

Page 76

... Full-spectrum White Noise (from CRC) 5: From ADC, least significant bits 6: RSSI / Cordic Magnitude Output 7: HSSD module. This feature will often require the DACs to be manually turned on in MANOR and TOPTST.ATESTMOD_MODE=4. 0 R/W I-branch DAC override value. 0 R/W Q-branch DAC override value. EM2420 Datasheet EM2420 Page ...

Page 77

... RAM read. Note that the crystal oscillator must be running for writing to the TXFIFO. Reset R/W Description - R/W Receive FIFO byte register, read / write. Note that the crystal oscillator must be running for accessing the RXFIFO. EM2420 Datasheet EM2420 Page ...

Page 78

... MHz clock signal output 16 MHz crystal oscillator stabilized, same as the status bit in Table 5 Frequency synthesizer, 4 MHz reference signal Frequency synthesizer, 4 MHz divided signal Frequency synthesizer, lock window Frequency synthesizer, synchronized lock window ADC clock signal 1 Low High EM2420 Datasheet EM2420 Page ...

Page 79

... Receiver bandpass filter calibration clock Reserved Reserved Reserved Reserved Reserved Reserved Frequency synthesizer frequency comparator value Frequency synthesizer, 4 MHz reference signal Frequency synthesizer, 4 MHz divided signal Frequency synthesizer, lock window Frequency synthesizer, synchronized lock window ADC clock signal 2 Low High EM2420 Datasheet EM2420 Page ...

Page 80

... The overall packet height is 0.85 +/- 0.05 All dimensions in mm The package is compliant to JEDEC standard MO-220. Ember Part Number: 120-0049-000D 6.9 6.65 0.18 0.3 5.05 7.0 6.75 0.5 0.4 5.10 7.1 6.85 0.30 0.5 5.15 EM2420 Datasheet EM2420 E2 5.05 5.10 5.15 Page ...

Page 81

... Recommended layout for package (QLP 48) Note: The figure is an illustration only and not to scale. There are nine 14 mil diameter via holes distributed symmetrically in the ground pad under the package. See also the EM2420 EM reference design. Package thermal properties Thermal resistance Air velocity [m/s] ...

Page 82

... Ordering part number Description EM2420 Single Chip RF Transceiver and EmberNet Networking Stack EM2420TR Single Chip RF Transceiver and EmberNet Networking Stack EM2420 Ember Evaluation Kit EM2420EK EM2420 Ember Developer Kit EM2420DK Ember Part Number: 120-0049-000D Component Hole Reel Pitch Pitch Diameter 12 mm ...

Page 83

... Ember Corporation reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. This data sheet contains specifications on a product that has been discontinued by Ember Corporation. The data sheet is printed for reference information only. EM2420 Datasheet EM2420 Page ...

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... Congress St., 4 Floor Boston, MA 02210 USA Tel: (617) 951-0200 Fax: (617) 951-0999 E-mail: info@ember.com Europe: Unit 29 Science Park, Milton Rd Cambridge CB4 0DW, UK Tel: +44 (0) 1223 423322 Fax: +44 (0) 1223 423390 Email: info@ember.com Ember Part Number: 120-0049-000D EM2420 Datasheet EM2420 Page ...

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