RFM12B_15 Datasheet, PDF (18/41 Pages) List of Unclassifed Manufacturers – Universal ISM Band FSK Transceiver

Bits 9-8 (d1 to d0): VDI (valid data indicator) signal response time setting:
VDI Logic Diagram:
d1 d0
00
01
10
11
Response
Fast
Medium
Slow
Always on
RFM12B
CR_LOCK
DRSSI
DQD
DRSSI
DQD
CR_LOCK
DQD
d0
d1
FAST
MUX
SEL0
SEL1
IN0
MEDIUM
IN1
SLOW
Y
IN2
VDI
LOGIC HIGH _IN3
CLR
SET Q
er *
R/S FF
CLR
Note:
* For details see the Power Management Command
Slow mode: The VDI signal will go high only if the DRSSI, DQD and the CR_LOCK (Clock Recovery Locked) signals present at the same
time. It stays high until any of the abovementioned signals present; it will go low when all the three input signals are low.
Medium mode: The VDI signal will be active when the CR_LOCK signal and either the DRSSI or the DQD signal is high. The valid data
indicator will go low when either the CR_LOCK gets inactive or both of the DRSSI or DQD signals go low.
Fast mode: The VDI signal follows the level of the DQD signal.
Always mode: VDI is connected to logic high permanently. It stays always high independently of the receiving parameters.
Bits 7-5 (i2 to i0):
Receiver baseband bandwidth (BW) select:
i2 i1 i0
00 0
00 1
01 0
01 1
10 0
10 1
11 0
11 1
BW [kHz]
Reserved
400
340
270
200
134
67
Reserved
18
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