ZAMC4100 Datasheet, PDF (143/155 Pages) Integrated Device Technology – Actuator and Motor Controller

ZAMC4100 Datasheet
5.2.4. Short or Open Sensor Supply Detection
Event
The sensor supply pin S_P is shorted to one of the supply rails, or it is floating.
Detection
Current sink and source are connected to the pin and the voltage drop over them is monitored.
More information is given in section 3.12.10. See for Table 1.13 for electrical specifications.
Capturing The event is captured as a diagnostic status flag in the SBC and can be read via the SPI.
Reaction
A response should be implemented in the MCU software depending on application requirements.
5.2.5. ADC Ratiometric Test
Event
There is a failure in the ADC analog or digital control/data path.
Detection
The input multiplexer connects the input of the ADC to fixed points from the resistive divider of the
position potentiometers’ supply voltage. The measurement is ratiometric and does not depend on
internal reference sources. The conversion result is compared with the expected one.
Details for software implementation:
ADC channel selected by the ADCCTRL register: IMPSEL[4:0] = 19_HEX (i.e., channel 25_DEC)
Expected ADC conversion result:
ADCRES[9:0] = 682 ± 15 (unsigned result)
ADC channel selected by ADCCTRL register:
Expected ADC conversion result:
IMPSEL[4:0] = 1A_HEX
ADCRES[9:0] = 341 ± 15 (unsigned result)
Notes:
1. For proper execution of this test, the internal sensor supply should be enabled (set bits SPSWEN and
SNSWEN in AINCONF register) or the external sensor supply should be applied between the S_P and
S_N pins.
2. The expected conversion results are specified for maximum sampling rate: 125ksps. At higher speeds,
the ADC conversion results obtained will be out of the specified range.
Capturing The event is captured in the MCU by reading the ADC conversion value.
Reaction
A response should be implemented in the MCU software depending on application requirements.
5.2.6. ADC Test Absolute
Event
There is a failure in the ADC analog or digital control/data path.
Detection
The ADC input is connected to the internal reference voltage. The value of this voltage is Vref/2
and the ADC should return the midscale value.
Details for software implementation:
ADC channel selected by ADCCTRL register:
Expected ADC conversion result:
IMPSEL[4:0] = 1B_HEX
ADCRES[9:0] = 512 ± 15 (unsigned result)
Capturing The event is captured in the MCU by reading the ADC conversion value.
Reaction
A response should be implemented in the MCU software depending on application requirements.
© 2016 Integrated Device Technology, Inc.
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January 26, 2016