CS4245 datasheet(39/54 Pages) CIRRUS

39 / 54 page

CS4245

6.1

Chip ID - Register 01h

Function:

This register is Read-Only. Bits 7 through 4 are the part number ID which is 1100b (0Ch) and the re-

maining bits (3 through 0) are for the chip revision.

6.2

Power Control - Address 02h

6.2.1

Freeze (Bit 7)

Function:

This function allows modifications to be made to certain control port bits without the changes taking

effect until the Freeze bit is disabled. To make multiple changes to these bits take effect simulta-

neously, set the Freeze bit, make all changes, then clear the Freeze bit. The bits affected by the

Freeze function are listed in Table 4 below.

6.2.2

Power Down MIC (Bit 3)

Function:

The microphone preamplifier block will enter a low-power state whenever this bit is set.

6.2.3

Power Down ADC (Bit 2)

Function:

The ADC pair will remain in a reset state whenever this bit is set.

6.2.4

Power Down DAC (Bit 1)

Function:

The DAC pair will remain in a reset state whenever this bit is set.

6.2.5

Power Down Device (Bit 0)

Function:

The device will enter a low-power state whenever this bit is set. The power-down bit is set by default

and must be cleared before normal operation can occur. The contents of the control registers are re-

tained when the device is in power-down.

PART3

PART2

PART1

PART0

REV3

REV2

REV1

REV0

76543

210

Freeze

Reserved

PDN_MIC

PDN_ADC

PDN_DAC

PDN

Table 4. Freeze-able Bits

Name

Bit(s)

MuteDAC

03h

MuteADC

04h

Gain[5:0]

07h

5:0

Gain[5:0]

08h

5:0

Vol[7:0]

0Ah

7:0

Vol[7:0]

0Bh

7:0

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