EM2420-STR Ember, EM2420-STR Datasheet - Page 35

• Manufacturer Part Number: EM2420-STR
• Description: IC RF TXRX ZIGBEE 2.4GHZ 48-QLP
• Manufacturer: Ember

Specifications of EM2420-STR

• Mfg Application Notes: EM2420
• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4
• Applications: 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: Contains lead / RoHS non-compliant
• Memory Size: -

RF Data Buffering
The
transmit and receive modes, as set in the
MDMCTRL1.TX_MODE
MDMCTRL1.RX_MODE
Buffered mode (mode 0) will be used for
normal operation of the
other
purposes.
Buffered transmit mode
In buffered transmit mode (TX_MODE 0),
the 128 byte TXFIFO, located in the
EM2420
transmission.
(defined in the Frame Format section
below) is automatically inserted before the
length field during transmission. The
length field must always be the first byte
written to the transmit buffer for all frames.
Writing one or multiple bytes to the
TXFIFO is described in the FIFO access
section on page 27. Reading data from the
TXFIFO is possible with RAM access, but
this does not remove the byte from the
FIFO.
Transmission is enabled by issuing a
STXON or STXONCCA command strobe.
Ember Part Number: 120-0049-000D
(LSB
Data
input
first)
Data in RXFIFO
Figure 18. The
EM2420
modes
RAM, is used to buffer data before
r0
can be configured for different
r1
A
Length byte
Figure 19. Data in RXFIFO when MDMCTRL0.AUTOCRC is set
are
EM2420
r2
preamble
n
available
r3
control
Frame Check Sequence (FCS) hardware implementation [1]
EM2420
MPDU
r4
sequence
for
1
, while
r5
bits.
and
test
EM2420 Datasheet
MPDU
r6
2
r7
Bit number
See the Radio control state machine
section on page 40 for an illustration of
how the transmit command strobes affect
the state of the
strobe is ignored if the channel is busy.
See
r8
r9
MPDU
r10
CRC
OK
7
MPDU
6
r11
EM2420
Correlation value (unsigned)
n-2
5
r12
EM2420
. The STXONCCA
4
(signed)
r13
RSSI
3
r14
Page 35 of 84
2
CRC / Corr
r15
1
the
0