Datasheet

Functional description of the SPI L99H01
38/53 DocID15567 Rev 6
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 V
S
recovers from OV/UV condition to normal operating voltage range, the
charge pump is automatically enabled;
– 1: If V
S
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
Bit765 43210
Name RWD FW_PAS OFF_CAL CLK_SPCTR OVT OV_UV_ RD DIAG1 DIAG0
<default> 0 0 0 0 0 0 0 0
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
00 V
SCD1
= 0.5 V
01 V
SCD2
= 1 V
10 V
SCD3
= 1.5 V
11 V
SCD4
= 2 V