DAC161S997

SNAS621 – JUNE 2013

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If a Loop error and a SPI Timeout error occur simultaneously and the device is configured with conflicting error

output currents, the OUT pin current reports the Loop Error.

STATUS Register

Loop Reporting

ERRB Reporting

Frame Error

Reported in FERR_STS

Not reported

Always reported

Reported by default unless

Reported by default unless

Reported in LOOP_STS and

Loop Error

ERR_CONFIG:MASK_LOOP_E

ERR_CONFIG:DIS_LOOP_ERR_ERRB

CURR_LOOP_STS

RR is set to 1

is set to 1

Reported by default unless either

ERR_CONFIG:MASK_SPI_ERR

Reported by default unless

SPI Timeout Error

Reported in SPI_TIMEOUT_ERR

or

ERR_CONFIG:MASK_SPI_TOUT is set

ERR_CONFIG:MASK_SPI_TOU

to 1

T are set to 1

Alarm Current

By default, the DAC161S997 reports faults to the plant controller by forcing the OUT current into one of two error

bands. The error current bands are defined as either greater than 20 mA, or less than 4 mA. Loop errors are

reported by setting current of ERR_LOW.

If SPI Timeout Errors are reported on the loop (this is the default; it can be changed by setting the register

ERR_CONFIG:MASK_LOOP_ERR), the error band is controlled by the ERRLVL pin. When ERRLVL is tied to

the COMD voltage, the ERR_LOW current is the reporting current. If ERRLVL is tied to VD then the ERR_HIGH

current is the current-on pin, OUT, if a SPI timeout error occurs.

The exact value of the output current used to indicate fault is dictated by the contents of ERR_HIGH and

ERR_LOW registers.

In the case of a conflicting alarm-current setting (such as a loop error and SPI timeout error occurring

simultaneously and ERRLVL is tied high), the current-on pin, OUT, is determined by ERR_LOW current.

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Product Folder Links: DAC161S997