HT82K75REW datasheet(62/103 Pages) HOLTEK

62 / 103 page

HT82M75REW/HT82K75REW

Rev. 1.00

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

²00² to select for STANDBY Mode.

· Set LREG0x277 [3:2] to

²10² for enable sleep voltage automatically controlled by internal circuit.

· Set LREG0x253 [4] to

²1² 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

²00² to select for DEEP_SLEEP Mode.

· Set LREG0x277 [3:2] to

²10² 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

²11² to select for POWER DOWN Mode.

· Set LREG0x277 [3:2] to

²10² for enable sleep voltage automatically controlled by internal circuit.

· Set LREG0x253 [6:5] to

²11² 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

²0² to disable SPISYNC.

· Set SREG0x35 [7] to

²1² 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

SPISYNC

ENTXM

0000 0000

0x35

SLPACK

WAKECNT6 WAKECNT5 WAKECNT4 WAKECNT3 WAKECNT2 WAKECNT1 WAKECNT0

0000 0000

0x250

RFCTRL50

DCPOC

DCOPC3

DCOPC2

DCOPC1

DCOPC0

0000 0000

0x253

RFCTRL53

FIFOPS

DIGITALPS

P32MXE

PACEN2

PACTRL2-2

PACTRL2-1

PACTRL2-0

0000 0000

0x277

RFCTRL77

SLPSEL1

SLPSEL0

SLPVCTRL1 SLPVCTRL0

SLPVSEL1

SLPVSEL0

0000 1000

HT82K75REW Datasheet(PDF) 62 Page - Holtek Semiconductor Inc

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