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DAC161S997 データシート(PDF) 9 Page - Texas Instruments

部品番号 DAC161S997
部品情報  DAC161S997 16-Bit SPI-Programmable DAC for 4-20 mA Loops
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

DAC161S997 データシート(HTML) 9 Page - Texas Instruments

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DAC161S997
www.ti.com
SNAS621A – JUNE 2013 – REVISED DECEMBER 2014
Feature Description (continued)
When a loop error occurs, the DAC161S997 sets the CURR_LOOP_STATUS and LOOP_STATUS fields in the
STATUS register to 1. The LOOP_STATUS field remains set to 1 until the STATUS register is read or the device
is reset. If the loop error is cleared, either by the device reasserting the loop current or by changing the OUT
current , then the CURR_LOOP_STATUS field clears.
8.3.1.2 SPI Timeout Error (Channel Error)
The DAC161S997 expects to receive periodic SPI write commands to ensure that the SPI connection is
functioning normally. If no SPI write command occurs within the time indicated by the SPI_TIMEOUT field in the
ERROR_CONFIG register, the device reports a SPI timeout error. Note that the SPI write command must be
properly formatted to avoid SPI Timeout errors (such as a write command that generates a frame error does not
prevent an imminent SPI Timeout error).
SPI Timeout error reporting is inhibited by MASK_SPI_TOUT. SPI Timeout errors are not reported on the loop if
MASK_SPI_ERR is set to 1.
Note that a write command to address 0 is not considered a valid write command and will not prevent a SPI
Timeout error.
8.3.1.3 Frame Error
If a SPI write command has an incorrect number of SCLK pulses, the device reports a frame error. The number
of SCLK pulses must be an integer and a multiple of 24. A frame error is always reported by ERRB being pulled
low. A frame error does not affect the loop current.
8.3.1.4 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.
8.4 Device Functional Modes
The DAC161S997 reports errors in 3 different ways, by changing the OUT pin current, pulling the ERRB pin low,
and by updating the read-only register STATUS. The reporting on ERRB and OUT pin is customized by setting
the ERROR_CONFIG register.
The ERRB pin connects to a GPIO pin on the microcontroller to function as an interrupt if an error occurs.
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
Copyright © 2013–2014, Texas Instruments Incorporated
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