L9374LF datasheet(41/80 Pages) STMICROELECTRONICS

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L9374LF

Circuit description

4.8

Diagnostics

There is a large amount of diagnostic functions in the L9374LF. These functions are

designed to verify internal as well as external conditions to the L9374LF. In so doing virtually

every function is checked for proper operation. All of the diagnostic results are read by the

master μC via SPI commands.

Figure 25. Diagnosis block diagram

4.8.1

Undercurrent / openload

Undercurrent can be detected if the current through the load in on-state is below the

undercurrent threshold (IUC,Table 15) for longer than the filter time (tUC,Table 18). The filter

is active in that a counter counts up when the undercurrent is detected (the device is on

AND load current below IUC) and counts down when undercurrent is not detected (either the

device is off OR the current is above IUC). Once undercurrent is detected the SPI fault bit is

reset when the counter reaches 0.

This bit is not latched unless undercurrent is detected during the SVDT test.

L9374LF bảng dữ liệu(PDF) 41 Page - STMicroelectronics