ZAMC4100 datasheet(142/156 Pages) RENESAS

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ZAMC4100 Datasheet

142

January 26, 2016

5.2.

MCU Activated Diagnostic Functions

All hardware resources needed for these diagnostics are available in the SBC, but the procedures must be

executed by the MCU.

5.2.1.

Open-Load Detection

Event

There is an open in one or more drivers’ outputs.

Detection

A current source is connected to the output and the voltage drop over the load is observed. If the

load is open, the voltage drop is zero. More information for this procedure is given in sections

3.8.3, 3.9.3, and 3.11.3. Also see Table 1.8 and Table 1.9 for electrical specifications.

Capturing

The event is captured as diagnostic status flag in SBC chip and can be read via the SPI.

Reaction

Should be implemented in MCU software depending on the application requirements.

5.2.2.

Short to Vbat or GND Detection

Event

The driver output is shorted to Vbat or GND.

Detection

Two current sources (sink and source) are connected to the output and the voltage drop over

them is observed. If an event occurs, the potential will not be changed (zero in the event of a

short to GND or Vbat in the event of a short to Vbat). More information for this procedure is given

in sections 3.8.3, 3.9.3, and 3.11.3. See Table 1.8 and Table 1.9 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 MCU software depending on the application requirements.

Note: The short to Vbat or GND diagnostic is possible only for the half-bridge drivers. For high-side drivers, only short to VBAT

can be detected independently. Short to GND will cause an over-current event.

5.2.3.

Floating Analog Input Detection

Event

One of the analog inputs (AINx pins) is floating or shorted.

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 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.

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