ZAMC4100 datasheet(140/156 Pages) RENESAS

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ZAMC4100 Datasheet

140

January 26, 2016

ZAMC4100 Protection and Diagnostic Features

This section is a summary description of all protection and diagnostic features available in the ZAMC4100. The

description is structured similarly to the way the diagnostics are handled:

event à detection à capturing à reaction

5.1.

Full-Time Diagnostic and Protection Features

It includes features that might always be present whenever the system is powered and do not interrupt or

influence the normal operation. They are executed in the background automatically and interrupt the normal

operation only if a specific event occurs. Some of these features might be masked by the software and MCU;

others cannot be masked (mainly protection functions).

5.1.1.

Over-Current (OC) Protection

Event

The current through one of the output driver transistors is above the maximum specified value for

the corresponding output.

Detection

Continuous comparison with a fixed reference level with pure analog circuitry; possible measuring

with the ADC in parallel; invoked by the software.

Capturing

Captured in the digital SBC.

Reaction

Response in both digital and analog domains:

1) The driver of this transistor automatically limits the current in order to avoid silicon damage.

Important: This reaction is implemented as analog circuitry, and it cannot be masked.

2) An over-current interrupt flag is set in the digital SBC, and the drivers are automatically

disabled.

5.1.2.

Over-Load (OVL) Detection using the ADC

Event

The current through one of the output driver transistors is above a certain limit (OVL level) that is

considered as a maximum current allowed for the driven load. The OVL level is always below the

OC level.

Detection

Initiated by the MCU firmware. The measured current by the ADC is compared with the OVL level

in the MCU or with the ADC comparator.

Capturing

The event is captured in the MCU.

Reaction

A response should be implemented in the MCU software depending on the application

requirements.

ZAMC4100 Datasheet(PDF) 140 Page - Renesas Technology Corp

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