ADS5400IPZP datasheet(19/48 Pages) TI

19 / 48 page

ADS5400

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SLAS611B – OCT 2009 – REVISED MARCH 2010

Description of Serial Registers

Each register function is explained in detail below.

Table 6. Serial Register 0x00 (Read or Write)

Address (hex)

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

0x00

Analog Gain Adjustment bits<11:4>

Defaults

BIT <7:0>

Analog gain adjustment (most significant 8 bits of a 12 bit word)

All 12-bits in this adjustment in address 0x00 and 0x01 set to 0000

0000 0000 = fullscale analog input 2.0VPP

All 12-bits in this adjustment in address 0x00 and 0x01 set to 1111

1111 1111 = fullscale analog input 1.52VPP

Step adjustment resolution is 120µV.

Can be used for one-time setting or continual calibration of analog

signal path gain.

Table 7. Serial Register 0x01 (Read or Write)

Address (hex)

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

BIT 1

BIT 0

0x01

Analog Gain Adjustment bits<3:0>

3 or 4-pin SPI

SPI Reset

Defaults

BIT <0:1>

RESERVED

set to 0 if writing this register

do not set to 1

BIT <2>

SPI Register Reset

altered register settings are kept

resets all SPI registers to defaults (self clearing)

BIT <3>

Set SPI mode to 3- or 4-pin

3-pin SPI (read/write on SDIO, SDO not used)

4-pin SPI (SDIO is write, SDO is read)

BIT <7:4>

Analog gain adjustment continued (least significant 4 bits of a

12-bit word)

All 12-bits in this adjustment in address 0x00 and 0x01 set to 0000

0000 0000 = fullscale analog input 2VPP

All 12-bits in this adjustment in address 0x00 and 0x01 set to 1111

1111 1111 = fullscale analog input 1.52VPP

Step adjustment resolution is 120µV.

Can be used for one-time setting or continual calibration of analog

signal path gain.

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