DAC161S997

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SNAS621 – JUNE 2013

REGISTER SET

Unless otherwise indicated, bits outside the register fields listed below are do not care, and will not change

device configuration. Register read operations on such do not care fields will be 0. Registers are read/write

unless indicated otherwise.

Table 1. XFER_REG (Write Only)

Address = 0x01

Bit Field

Field Name

Description

When PROTECT_REG_WR is set to 1, then a XFER_REG command is necessary to

15:0

XFER[15:0]

transfer the previous register write data into the appropriate address. Set this register

to 0x00FF to perform a XFER_REG command.

Table 2. NOP

Address = 0x02

Bit Field

Field Name

Description

No Operation. A write to this register will not change any device configuration.

15:0

NOP[15:0]

This command indicates that the SPI connection is functioning and is used to avoid

SPI_INACTIVE errors.

Table 3. WR_MODE

Address = 0x03; Default = 0x0000

Bit Field

Field Name

Description

0: Register write data transfers to appropriate address immediately after CSB goes

high. Default value.

0

PROTECT_REG_WR

1: Enable protected register transfers: all register writes require a subsequent

XFER_REG command to finalize the loading of register data. Refer to OPTIONAL

PROTECTED SPI WRITES

Table 4. DACCODE

Address = 0x04; Default = 0x2400, 0xE800

Bit Field

Field Name

Description

16-bit natural binary word, where D15 is the MSB, which indicates the desired DAC

output code.

15:0

DACCODE[15:0]

Note the default value of this register is based on the state of the ERR_LVL pin during

startup or reset.

Table 5. ERR_CONFIG

Address = 0x05; Default = 0x0102

Bit Field

Field Name

Description

L_RETRY_TIME sets the time interval between successive attempts to reassert the

desired DACCODE output current when a loop error is present. This has no effect if

either MASK_LOOP_ERR is set to 1 or if DIS_RETRY_LOOP is set to 1.

10:8

L_RETRY_TIME[2:0]

LOOP Retry time = (L_RETRY_TIME + 1) × 50 ms

Default value = 1 (100 ms)

0: When a loop error is occurring, periodically attempt to send desired DACCODE

output current instead of the set ERR_LOW current. The interval between attempts is

set by L_RETRY_TIMER. Default value.

7

DIS_RETRY_LOOP

1: Do not periodically reassert DACCODE output when a loop error is present;

reassert DACCODE after STATUS Register is read out.

0: When a LOOP error is detected the DAC161S997 outputs the current indicated by

ERR_LOW instead of DACCCODE. Default value.

6

MASK_LOOP_ERR

1: When a Loop Error is detected the DAC161S997 tries to maintain DACCODE

current on pin OUT.

Copyright © 2013, Texas Instruments Incorporated

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