L99H02 datasheet(37/51 Pages) STMICROELECTRONICS

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DS12547 Rev 6

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L99H02

Functional description of the SPI

4.6

Detailed byte description of application registers (ApplRegX)

The write/read operation starts always with a command byte followed by 1 data byte.

4.6.1

Description of the data byte

The device uses 3 application registers to configure the device. The default values

represent the bits values after a POR event.

Comments:



RWD: restarts the watchdog counter by setting the bit to one



FW_PAS: enables passive free wheeling according to Table 23



OFF_CAL: offset calibration mode for CSA



OVT: overvoltage threshold selection



CLK_SPCTR: switch the clock to the charge pump

–

0: 125 Khz (50% duty cycle)

–

1: pulses train (max = 8 µs, min = 2 µs) to optimize power spectrum



OV_UV_RD: over/undervoltage recovery disabled.

–

0: if VS recovers from OV/UV condition to normal operating voltage range, the

charge pump is automatically enabled;

–

1: if VS recovers from OV/UV condition to normal operating voltage range, the

charge pump remains disabled;

In both cases the microcontroller has to clear the status register to enable the gate

drivers



DIAG[1:0]: drain source monitoring threshold voltage selection

Table 33. Address 1 <01(hex)>:ApplReg1-read/write

Bit

Name

RWD

FW_PAS

OFF_CAL

CLK_SPCTR

OVT

OV_UV_ RD

DIAG1 DIAG0

Table 34. Overvoltage threshold of the Vs monitoring

OVT

Threshold

020 V

129 V

Table 35. DIAG monitoring of source voltages

DIAG[1]

DIAG[0]

Monitoring threshold voltage

VSCd1= 0.5 V

VSCd2 = 1 V

VSCd3 = 1.5 V

VSCd4 = 2 V

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