EM2420-STR Ember, EM2420-STR Datasheet - Page 72

• 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: -

MANOR (0x22) - Manual signal OR override register
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
AGCCTRL (0x23) - AGC Control
15:12
11
10:4
3:2
1:0
AGCTST0 (0x24) - AGC Test Register 0
Bit
15:12
11:6
5:0
Ember Part Number: 120-0049-000D
Bit
Bit
Field Name
VGA_RESET_N
BIAS_PD
BALUN_CTRL
RXTX
PRE_PD
PA_N_PD
PA_P_PD
DAC_LPF_PD
XOSC16M_PD
RXBPF_CAL_PD
CHP_PD
FS_PD
ADC_PD
VGA_PD
RXBPF_PD
LNAMIX_PD
Field Name
-
VGA_GAIN_OE
VGA_GAIN [6:0]
LNAMIX_GAINMODE_O
[1:0]
LNAMIX_GAINMODE
[1:0]
Field Name
LNAMIX_HYST[3:0]
LNAMIX_THR_H[5:0]
LNAMIX_THR_L[5:0]
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reset
0
0
0x7F
0
0
Reset
3
25
9
EM2420 Datasheet
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
W0
R/W
R/W
R/W
R
R/W
R/W
R/W
R/W
Description
The VGA_RESET_N signal is used to reset the peak detectors in
the VGA in the RX chain.
Global Bias power down (1)
The BALUN_CTRL signal controls whether the PA should receive
its required external biasing (1) or not (0) by controlling the
RX/TX output switch.
RXTX signal: controls whether the LO buffers (0) or PA buffers
(1) should be used.
Powerdown of prescaler.
Powerdown of PA (negative path).
Powerdown of PA (positive path). When PA_N_PD=1 and
PA_P_PD=1 the up-conversion mixers are in powerdown.
Powerdown of TX DACs.
Powerdown control of complex bandpass receive filter calibration
oscillator.
Powerdown control of charge pump.
Powerdown control of VCO, I/Q generator, LO buffers.
Powerdown control of the ADCs.
Powerdown control of the VGA.
Powerdown control of complex bandpass receive filter.
Powerdown control of LNA, down-conversion mixers and
frontend bias.
Description
Reserved, write as 0
Use the VGA_GAIN value during RX instead of the AGC value.
When written, VGA manual gain override value; when read, the
currently used VGA gain setting.
LNA / Mixer Gain mode override setting
0 : Gain mode is set by AGC algorithm
1 : Gain mode is always low-gain
2 : Gain mode is always med-gain
3 : Gain mode is always high-gain
Status bit, defining the currently selected gainmode selected by
the AGC or overridden by the LNAMIX_GAINMODE_O setting.
Description
Hysteresis on the switching between different RF frontend gain
modes, defined in 2 dB steps
Threshold for switching between medium and high RF frontend
gain mode, defined in 2 dB steps
Threshold for switching between low and medium RF frontend
EM2420
Page 72 of 84