MLX83202 Datasheet, PDF (17/35 Pages) Melexis Microelectronic Systems – Automotive NFET pre-drivers

MLX83202/MLX83203
Automotive NFET pre-drivers
VREG_OV_BF_EN
0
1
Pre-driver reaction on error event
VREG_OV is reported on ICOM, but the pre-driver remains active.
VREG_OV is reported on ICOM and the pre-driver is disabled.
Table 7. Pre-driver reaction on VREG_OV
8.4.5 Undervoltage warnings
Comparators are implemented to detect an under voltage on VSUP, VBOOST, VREG, VDD and VGS. If an
under voltage is detected, it will be reported to the MCU. It is the responsibility of the user to take action to
assure functional operation.
8.4.6 Over temperature warning
If the junction temperature exceeds the specified threshold, a warning will be communicated to the MCU. The
pre-driver will continue in normal operation. It is the responsibility of the user to protect the IC against over
temperature destruction.
8.4.7 EEPROM error warning
To ensure reliable communication with EEPROM the pre-driver provides an automatic single bit error
correction. If two bits in the addressed word are bad the EEPROM gives the EEP_ERR warning, indicating a
double error was detected.
8.4.8 ICOM diagnostics interface
ICOM is a serial interface that feeds back detailed diagnostics information to the MCU over a single wire. In
normal operation, when no error is detected, ICOM is high. When an error is detected the pre-driver will
inform the MCU via a PWM duty cycle on ICOM. It is the responsibility of the MCU to catch the ICOM duty
cycle and disable the driver if necessary, by pulling EN low.
Each error corresponds to a duty cycle with a 5 bit resolution. The duty cycle is transmitted until the MCU
acknowledges the reception of the duty cycle.
For the MCU to acknowledge the error, it should be able to keep the line low while ICOM is pulling the line
high, for a period T_Ack > T_ICOM. At each ICOM falling edge the pre-driver checks the actual voltage on ICOM to
detect an acknowledgement. When an acknowledgement is detected the PWM duty cycle is changed to the
corresponding duty cycle of the next error to be transmitted.
3901083203
Rev 2.2
Figure 8. ICOM diagnostics interface
Page 17 of 35
Prelim. Data Sheet
4 Dec 2013