MLX83202/MLX83203

Automotive NFET pre-drivers

3901083203

Page 19 of 35

Prelim. Data Sheet

Rev 2.2

4 Dec 2013

Two modes for supplying diagnostic feedback to the MCU are possible and can be set in EEPROM.

The first mode is the slow response diagnostic mode and uses a larger PWM period to communicate

diagnostics information to the MCU over ICOM.

The second mode is the fast response diagnostic mode and uses a PWM period that is ~8 times smaller.

This fast mode allows the fastest response time of the interrupt routine form the external MC, but also implies

the MCU needs to be fast enough in order to be able to capture the duty cycle. For the fast response

diagnostic mode the MCU clock needs to be minimum 20MHz.

Note:



The different diagnostic feedback modes (slow/fast) are applicable independent of the configuration

of the internal hardware protection features.



When VDD is pulled low to put the pre-driver in sleep mode ICOM will go low as well. As soon as

VDD goes high, ICOM will go high as well and remains high. No EOF may be required.



At POR it is possible that the voltages on VSUP, VBOOST and VREG have not been achieved (dut

to charging of the external capacitors) and thus it is possible ICOM may immediately go in diagnostic

mode. This implies the MCU has to acknowledge these errors until the under voltage conditions have

been resolved. As soon as the EOF duty cycle is acknowledged and ICOM remains high, the pre-

driver is ready for normal operation.

8.4.9 Pre-driver output state summary

Below table shows all conditions due to which the pre-driver may be disabled:

The pre-driver is disabled (high-impedance state)

The Pre-driver is released again

As soon as an error condition appears for which the hardware

protection is activated



VSUP_OV



VDS



VREG_OV

As soon as the EOF has been acknowledged.

As soon as VDD = LOW

As soon as VDD = HIGH

As soon as EN = LOW

As soon as EN = HIGH

Table 9. Pre-driver output summary