IA4420 Datasheet, PDF (13/29 Pages) List of Unclassifed Manufacturers – Universal ISM Band FSK Transceiver

IA4420
2. Power Management Command
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
1 0 0 0 0 0 1 0 er ebb et es ex eb ew dc
POR
8208h
Bit
Function of the control bit
er
Enables the whole receiver chain
The receiver baseband circuit can be separately
ebb
switched on
Switches on the PLL, the power amplifier, and starts
et
the transmission (If TX register is enabled)
es
Turns on the synthesizer
ex
Turns on the crystal oscillator
eb
Enables the low battery detector
ew
Enables the wake-up timer
dc
Disables the clock output (pin 8)
Related blocks
RF front end, baseband, synthesizer, oscillator
Baseband
Power amplifier, synthesizer, oscillator
Synthesizer
Crystal oscillator
Low battery detector
Wake-up timer
Clock output buffer
The ebb, es, and ex bits are provided to optimize the TX to RX or RX to TX turnaround time.
Logic connections between power control bits:
enable
power amplifier
et
start TX
Edge
detector
clear TX latch
(If TX latch is used)
enable
es
RF synthesizer
(osc.must be on)
enable
er
RF front end
enable baseband
circuits
ebb
(synt. must be on)
enable
oscillator
ex
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