EM2420 ETC [List of Unclassifed Manufacturers], EM2420 Datasheet - Page 80

• Manufacturer Part Number: EM2420
• Description: 2.4 GHz IEEE 802.15.4 / ZigBee RF Transceiver
• Manufacturer: ETC [List of Unclassifed Manufacturers]

FSTST3 (0x2A) - Frequency Synthesizer Test Register 3
15
14
13
12
11
10
9:8
7:4
3:0
RXBPFTST (0x2B) - Receiver Bandpass Filters Test Register
15
14
13:7
6:0
FSMSTATE (0x2C) - Finite state machine information
15:6
5:0
Ember Part Number: 120-0049-000C
Bit
Bit
Bit
Field Name
CHP_CAL_DISABLE
CHP_CURRENT_OE
CHP_TEST_UP
CHP_TEST_DN
CHP_DISABLE
PD_DELAY
CHP_STEP_PERIOD[1:0]
STOP_CHP_CURRENT[3:0]
START_CHP_CURRENT[3:0]
Field Name
-
RXBPF_CAP_OE
RXBPF_CAP_O[6:0]
RXBPF_CAP_RES[6:0]
Field Name
-
FSM_CUR_STATE[5:0]
Reset
1
0
0
0
0
0
2
13
13
Reset
0
0
0
-
Reset
0
-
EM2420 Datasheet
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
R/W
W0
R
Description
Disable charge pump during VCO calibration when set.
Charge pump current override enable
0 : Charge pump current set by calibration
1 : Charge pump current set by START_CHP_CURRENT
Forces the CHP to output "up" current when set
Forces the CHP to output "down" current when set
Set to manually disable charge pump by masking the up and
down pulses from the phase-detector.
Selects short or long reset delay in phase detector:
0: Short reset delay
1: Long reset delay
The charge pump current value step period:
0: 0.25 us
1: 0.5 us
2: 1 us
3: 4 us
The charge pump current to stop at after the current is stepped
down from START_CHP_CURRENT after VCO calibration is
complete. The current is stepped down periodically with intervals
as defined in CHP_STEP_PERIOD.
The charge pump current to start with after VCO calibration is
complete. The current is then stepped down periodically to the
value STOP_CHP_CURRENT with intervals as defined in
CHP_STEP_PERIOD.
Also used for overriding the charge pump current when
CHP_CURRENT_OE=’1’
Description
Reserved, write as 0.
RX bandpass filter capacitance calibration override enable.
RX bandpass filter capacitance calibration override value.
RX bandpass filter capacitance calibration result.
0 Minimum capacitance in the feedback.
1: Second smallest capacitance setting.
…
127: Maximum capacitance in the feedback.
Description
Reserved, write as 0.
Gives the current state of the FIFO and Frame Control (FFCTRL)
finite state machine. See the Radio control state machine section
on page 42 for details.
EM2420
Page 80 of 89