DocID023813 Rev 4
Current sense and diagnostic
The current sense pin performs a double function (see Figure 16: Current sense and
Current mirror of the load current in normal operation, delivering a current
proportional to the load one according to a known ratio KX.
The current ISENSE can be easily converted to a voltage VSENSE by means of an
external resistor RSENSE. Linearity between IOUT and VSENSE is ensured up to 5V
minimum (see parameter VSENSE in Table 9: Current sense (8 V < VCC < 18 V)). The
current sense accuracy depends on the output current (refer to current sense electrical
characteristics Table 9: Current sense (8 V < VCC < 18 V)).
Diagnostic flag in fault conditions, delivering a fixed voltage VSENSEH up to a
maximum current ISENSEH in case of the following fault conditions (refer to Truth table):
Power limitation activation
Short to VCC in off-state
Open-load in off-state with additional external components.
A logic level high on CS_DIS pin sets at the same time all the current sense pins of the
device in a high impedance state, thus disabling the current monitoring and diagnostic
detection. This feature allows multiplexing of the microcontroller analog inputs by sharing of
sense resistance and ADC line among different devices.
Figure 16. Current sense and diagnostic