PowerSSO-36 datasheet(38/53 Pages) STMICROELECTRONICS

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Functional description of the SPI

L99H01

38/53

DocID15567 Rev 5

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. Note that the last row shows

the logic levels during a reset phase.

Comments:

•

RWD: Restarts the watchdog counter

•

FW_PAS: Enables passive free wheeling according to Table 23

•

OFF_CAL: Offset calibration mode for CSA

•

OVT: Overvoltage threshold

•

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

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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