Circuit description

UM1996

16/29

DocID028716 Rev 2

Figure 11: X-NUCLEO-IHM08M1

– power section

4.1.2

Overcurrent detection (OCP) and current sensing measurement

Over Current Protection (OCP) is implemented by hardware with a detection circuit. The

current is compared with an embedded current reference (by the MCU) and the output

generates a fault condition at the BKIN pin that goes to ground. This pin, connected to

STM32 Nucleo board (BKIN Timer function), detects this condition and immediately

disables the driving signals (see the schematic below).

Figure 12: X-NUCLEO-IHM08M1

– OCP circuit

The current sensing inputs (refer to the following three schematics) are connected to the

sensing resistors and you can choose between a three-shunt or single-shunt configuration

through jumpers J5 and J6 (see jumperSETtable).