EM2420-STR Ember, EM2420-STR Datasheet - Page 32

• 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: -

When an SFD is detected, data is written
to the RXFIFO and may be read out by the
microcontroller at a lower bit rate than the
250 kbps generated by the receiver.
The
symbol rate errors in excess of 120 ppm
without
Frame Format
The
parts of the IEEE 802.15.4 frame format.
This section gives a brief summary of the
IEEE
describes how the
comply with this.
Synchronization header
The
consists
followed by the start of frame delimiter
(SFD). In [1], the preamble sequence is
Ember Part Number: 120-0049-000D
I / Q Analog
Layer
Layer
MAC
PHY
IF signal
EM2420
Bytes:
EM2420
synchronization
802.15.4
Sequence
Preamble
Synchronisation Header
of
performance
4
Figure 15. Schematic view of the IEEE 802.15.4 Frame Format [1]
has hardware support for
demodulator also handles
the
(SHR)
ADC
frame
Start of frame
preamble
Figure 14. Demodulator Simplified Block Diagram
EM2420
Delimiter
(SFD)
1
header
format,
PHY Header
degradation.
IF Channel
is set up to
Filtering
Length
Digital
Frame
(PHR)
sequence
1
(SHR)
Bytes:
and
EM2420 Datasheet
Control Field
Frame
(FCF)
2
PHY Protocol Data Unit
Compensation
Generator
Frequency
11 + (0 to 20) + n
RSSI
MAC Header (MHR)
Offset
(PPDU)
Sequence
Number
Resynchronization
continuously to adjust for error in the
incoming symbol rate.
The MDMCTRL1.CORR_THR control bits
should be written to 20 to set the threshold
for detecting IEEE 802.15.4 start of frame
delimiters.
Figure 15 [1] shows a schematic view of
the IEEE 802.15.4 frame format. Similar
figures describing specific frame formats
(data
acknowledgment
command frames) are included in [1].
defined to be 4 bytes of 0x00. The SFD is
one byte, set to 0xA7.
In the
SFD is configurable. The default values
are compliant with [1]. Changing these
Data
1
EM2420
Information
RSSI
Address
0 to 20
PHY Service Data Unit
frames,
Filtering
Digital
5 + (0 to 20) + n
Data
MAC Protocol
Data Unit
(MPDU)
(PSDU)
, the preamble length and
frames
Frame payload
MAC Payload
beacon
EM2420
Synchronisation
Correlators and
is
n
Symbol
and
Value (may be
Page 32 of 84
used for LQI)
performed
Correlation
Average
frames,
Frame Check
MAC Footer
MAC
Sequence
(MFR)
(FCS)
2
Symbol
Output
Data