SLAS366 datasheet(30/56 Pages) TI2

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4–2

4.2

Control Register 2

TURBO

DIFBP

I2C6

I2C5

I2C4

GPO

HPC

R/W

NOTE: R = Read, W = Write

Table 4–2. Control Register 2 Bit Summary

BIT

NAME

RESET

VALUE

FUNCTION

TURBO

Turbo mode. This bit is used to set the SCLK rate.

TURBO = 0 SCLK = (16

× FS × #Device × mode)

TURBO = 1 SCLK = MCLK/P (P is determined in register 4)

DIFBP

Decimation/interpolation filter bypass. This bit is used to bypass both decimation and interpolation filters.

DIFBP = 0

Decimation/interpolation filters are operated.

DIFBP = 1

Decimation/interpolation filters are bypassed.

D5–D3

I2Cx

100

I2C device address. These three bits are programmable to define three MSBs of the I2C device address (reset

value is 100). These three bits are combined with the 4-bit SMARTDM device address to form 7-bit I2C device

address.

GPO

General-purpose output

D1–D0

HPC

Host port control bits.

Write the following values into D1–D0 to select the appropriate configuration for two pins SDA and SCL. SDA pin

is set to be equal to D2 if D1–D0 = 10.

D1–D0

SDA and SCL pins are used for I2C interface

SDA and SCL pins are used for S2C interface

SDA pin = D2, input going into SCL pin is output to DOUT

SDA pin = Control frame flag.

4.3

Control Register 3

PWDN

SWRS

OSR-option

ASRF

R/W

NOTE: R = Read, W = Write

Table 4–3. Control Register 3 Bit Summary

BIT

NAME

RESET

VALUE

FUNCTION

D7–D6

PWDN

Power down

PWDN = 00 No power down

PWDN = 01 Power-down A/D

PWDN = 10 Power-down D/A

PWDN = 11 Software power down the entire device

SWRS

Software reset. Set this bit to 1 to reset the device.

D4-D3

OSR op-

tion

OSR option.

D4–D3=X1 OSR for DAC Channel is 512( Max Fs=8Ksps)

D4–D3=10 OSR for DAC Channel is 256( Max Fs=16Ksps)

D4–D3=00 OSR for DAC Channel is 128(Max Fs=26Ksps)

D2-D0

ASRF

001

Asynchronous sampling rate factor. These three bits define the ratio n between FS frequency and the

desired sampling frequency fs (Applied only if different sampling rate between CODEC1 and CODEC2 is

desired)

ASRF = 001 n = FS/fs = 1

ASRF = 010 n = FS/fs = 2

ASRF = 011 n = FS/fs = 3

ASRF = 100 n = FS/fs = 4

ASRF = 101 n = FS/fs = 5

ASRF = 110 n = FS/fs = 6

ASRF = 111 n = FS/fs = 7

ASRF = 000 n = FS/fs = 8

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