MLX83202 Datasheet, PDF (19/35 Pages) Melexis Microelectronic Systems – Automotive NFET pre-drivers

MLX83202/MLX83203
Automotive NFET pre-drivers
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)
As soon as an error condition appears for which the hardware
protection is activated
 VSUP_OV
 VDS
 VREG_OV
As soon as VDD = LOW
As soon as EN = LOW
The Pre-driver is released again
As soon as the EOF has been acknowledged.
As soon as VDD = HIGH
As soon as EN = HIGH
Table 9. Pre-driver output summary
3901083203
Rev 2.2
Page 19 of 35
Prelim. Data Sheet
4 Dec 2013