MLX83202/MLX83203

Automotive NFET pre-drivers

3901083203

Page 21 of 35

Prelim. Data Sheet

Rev 2.2

4 Dec 2013

8.5.2 SPI communication

When the chip is in SPI mode the EEPROM is programmable and readable via the SPI port.

8.5.2.1 Entering / exiting SPI mode

The MLX83203 will enter from NORMAL mode into SPI mode when ALL below conditions are present:



EN = 0



All FETTx = low AND all FETBx high (all FET inputs are disabled)



ICOM:

o

Any pending errors have been acknowledged

o

A Low Level pulse is applied on ICOM between 256us (

2048/FOSC) and 512us (4096/FOSC)

The chip will return from SPI MODE to NORMAL MODE when



EN = 1.

This means that



any ongoing EEPROM writes will be completed



the EEPROM state machine will copy all EEPROM contents into registers

During this time the ICOM pin will be kept low.

Similar to when the MLX83203 comes out of POR, after leaving SPI MODE and returning to NORMAL

MODE, the MLX83203 will be blocked until the data have been copied to the registers. This assures that all

chip parameters are set correctly before starting.

Note: It only makes sense for the MCU to call for SPI if all errors are clear and acknowledged.

8.5.2.1 SPI protocol

Figure 10. SPI waveform example for read and write (LSB first)