TLV320AIC21 datasheet(38/56 Pages) TI1

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Control Register Content Description

TLV320AIC20, TLV320AIC21

TLV320AIC24, TLV320AIC25

TLV320AIC20K, TLV320AIC24K

SLAS363D – MARCH 2002 – REVISED APRIL 2005

Control Register 1(1)

ADOVF

IIR

DAOVF

BIASV

ALB

DLB

DAC16

R/W/S

R/W

R/W/S

R/W

R/W/S

(1)

NOTE: R = Read, W = Write, S = Shadowed

Control Register 1 Bit Summary

RESET

BIT

NAME

FUNCTION

VALUE

ADC over flow. This bit indicates whether the ADC is overflow.

ADOVF

ADOVF = 0 No overflow

ADOVF = 1 A/D is overflow.

Continuous data transfer mode. This bit selects between programming mode and continuous data transfer

mode.

CX = 0 Programming mode

CX = 1 Continuous data transfer mode

IIR Filter. This bit selects between FIR and IIR for decimation/interpolation low-pass filter.

IIR

IIR = 0 FIR filter is selected

IIR = 1 IIR filter is selected.

DAC over flow. This bit indicates whether the DAC is overflow

DAOVF

DAOVF = 0 No overflow

DAOVF = 1 DAC is overflow

Bias voltage. This bit selects the output voltage for BIAS pin

BIASV = 0

BIASV

BIAS pin = 1.35 V

BIASV = 1

BIAS pin = 2.35 V

Analog loop back

ALB

ALB = 0 Analog loopback disabled

ALB = 1 Analog loopback enabled

Digital loop back

DLB

DLB = 0 Digital loopback disabled

DLB = 1 Digital loopback enabled

DAC 16-bit data format. This bit applies to the continuous data transfer mode only to enable the 16-bit data

format for DAC input.DAC16 = 0 DAC input data length is 15 bits. Writing a 1 to the LSB of the DAC input to

DAC16

switch from continuous data transfer mode to programming mode.

DAC16 = 1 DAC input data length is 16 bit.

Control Register 2(1)

TURBO

DIFBP

I2C6

I2C5

I2C4

GPO

HPC

R/W/S

(1)

NOTE: R = Read, W = Write, S = Shadowed

Control Register 2 Bit Summary

RESET

BIT

NAME

FUNCTION

VALUE

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

TURBO

TURBO = 0 SCLK = (16 × FS × number of device × mode)

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

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

DIFBP

DIFBP = 0 Decimation/interpolation filters are operated.

DIFBP = 1 Decimation/interpolation filters are bypassed.

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

D5-D3

I2Cx

100

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

I2C device address.

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