si4420 Silicon Laboratories, si4420 Datasheet - Page 13

• Manufacturer Part Number: si4420
• Description: Si4420 Universal Ism Band Fsk Transceiver
• Manufacturer: Silicon Laboratories

2. Power Management Command
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:
Bit
Bit
er
ebb
et
es
ex
eb
ew
dc
15
1
ebb
es
ex
er
et
Function of the control bit
Enables the whole receiver chain
The receiver baseband circuit can be separately switched on
Switches on the PLL, the power amplifier, and starts the
transmission (If TX register is enabled)
Turns on the synthesizer
Turns on the crystal oscillator
Enables the low battery detector
Enables the wake-up timer
Disables the clock output (pin 8)
14
0
Edge
detector
13
0
(If TX latch is used)
12
0
(synt. must be on)
enable baseband
power amplifier
clear TX latch
(osc.must be on)
RF synthesizer
RF front end
start TX
oscillator
enable
enable
circuits
enable
enable
11
0
10
0
9
1
8
0
er
7
ebb
6
et
5
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
es
4
ex
3
eb
2
ew
1
dc
0
8208h
POR
Si4420
13