HT82M75REW/HT82K75REW
Rev. 1.00
62
June 11, 2010
RF Transceiver Power Saving Operation
Standby, Deep-Sleep and Power-Down Modes are designed for the RF Transceiver. It is only allowed to switch be-
tween power saving modes and active mode. The following settings are effective in active mode only.
Standby Mode
Shutdown RF/MAC/BB, while the voltage regulator, partial 32MHz clock and sleep clock remains active.
·
Set LREG0x277 [5:4] to
²
00
²
to select for STANDBY Mode.
·
Set LREG0x277 [3:2] to
²
10
²
for enable sleep voltage automatically controlled by internal circuit.
·
Set LREG0x253 [4] to
²
1
²
to enable partial 32MHz clock.
Deep_Sleep Mode
All power is shutdown except the power to the digital circuits and sleep clock. Registers and FIFOs are retained.
·
Set LREG0x277 [5:4] to
²
00
²
to select for DEEP_SLEEP Mode.
·
Set LREG0x277 [3:2] to
²
10
²
for enable sleep voltage automatically controlled by internal circuit.
Power Down Mode
All power is shutdown. Registers and FIFOs data are not retained. Initialization is needed after the RF Transceiver back
to active mode. Only the internal connected interrupt line named WAKE can wake the RF Transceiver up.
·
Set LREG0x277 [5:4] to
²
11
²
to select for POWER DOWN Mode.
·
Set LREG0x277 [3:2] to
²
10
²
for enable sleep voltage automatically controlled by internal circuit.
·
Set LREG0x253 [6:5] to
²
11
²
to connect the FIFO power and digital circuit power to ground.
If the internal connected interrupt line named WAKE is going to be used to wake the RF Transceiver up, the configura-
tion for WAKE line should be included. Refer to the following WAKE Line Wake-up Section for details. The on-chip
DC-DC converter is not used for this device and then bypasses it by setting the DCPOC bit in LREG0x250 register to 0.
After the necessary settings mentioned above are configured, user can execute the following procedures to disable
SPISYNC and place the RF Transceiver to the desired power saving mode.
·
Set SREG0x26 [5] to
²
0
²
to disable SPISYNC.
·
Set SREG0x35 [7] to
²
1
²
to place the RF Transceiver to power saving mode.
Registers associated with Power Saving Operation:
Addr.
File
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR
0x26
GATECLK
r
r
SPISYNC
r
r
ENTXM
r
r
0000 0000
0x35
SLPACK
SLPACK
WAKECNT6 WAKECNT5 WAKECNT4 WAKECNT3 WAKECNT2 WAKECNT1 WAKECNT0
0000 0000
0x250
RFCTRL50
r
r
r
DCPOC
DCOPC3
DCOPC2
DCOPC1
DCOPC0
0000 0000
0x253
RFCTRL53
r
FIFOPS
DIGITALPS
P32MXE
PACEN2
PACTRL2-2
PACTRL2-1
PACTRL2-0
0000 0000
0x277
RFCTRL77
r
r
SLPSEL1
SLPSEL0
SLPVCTRL1 SLPVCTRL0
SLPVSEL1
SLPVSEL0
0000 1000
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