EM2420-STR Ember, EM2420-STR Datasheet - Page 61

• 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: -

MDMCTRL0 (0x11) - Modem Control Register 0
15:14
13
12
11
10:8
7:6
5
4
3:0
Ember Part Number: 120-0049-000D
Bit
Field Name
-
RESERVED_FRAME_MODE
PAN_COORDINATOR
ADR_DECODE
CCA_HYST[2:0]
CCA_MODE[1:0]
AUTOCRC
AUTOACK
PREAMBLE_LENGTH
[3:0]
Reset
0
0
0
1
2
3
1
0
2
EM2420 Datasheet
R/W
W0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Description
Reserved, write as 0
Mode for accepting reserved IEE 802.15.4 frame types when
address recognition is enabled (
0 : Reserved frame types (100, 101, 110, 111) are rejected by
address recognition.
1 : Reserved frame types (100, 101, 110, 111) are always
accepted by address recognition. No further address decoding is
done.
When address recognition is disabled (
0
care.
Should be set high when the device is a PAN Coordinator. Used
for filtering packets with no destination address, as specified in
section 7.5.6.2 in 802.15.4, D18
Hardware Address decode enable.
0 : Address decoding is disabled
1 : Address decoding is enabled
CCA Hysteresis in dB, values 0 through 7 dB
0 : Reserved
1 : CCA=1 when RSSI_VAL < CCA_THR - CCA_HYST
2 : CCA=1 when not receiving valid IEEE 802.15.4 data,
3 : CCA=1 when RSSI_VAL < CCA_THR - CCA_HYST and not
In packet mode a CRC-16 (ITU-T) is calculated and is
transmitted after the last data byte in TX. In RX CRC is
calculated and checked for validity.
If AUTOACK is set, all packets accepted by address recognition
with the acknowledge request flag set and a valid CRC are
ack’ed 12 symbol periods after being received.
The number of preamble bytes (2 zero-symbols) to be sent in TX
mode prior to the SYNCWORD, encoded in steps of 2. The reset
value of 2 is compliant with IEEE 802.15.4, since the 4
byte is included in the SYNCWORD.
0 : 1 leading zero bytes (not recommended)
1 : 2 leading zero bytes (not recommended)
2 : 3 leading zero bytes (IEEE 802.15.4 compliant)
3 : 4 leading zero bytes
…
15 : 16 leading zero bytes
), all frames are received and
CCA=0 when RSSI_VAL ≥ CCA_THR
CCA=0 otherwise
CCA=0 when RSSI_VAL ≥ CCA_THR or receiving a packet
receiving valid IEEE 802.15.4 data.
EM2420
RESERVED_FRAME_MODE
MDMCTRL0.ADR_DECODE = 1
MDMCTRL0.ADR_DECODE =
Page 61 of 84
th
is don’t
zero
).