Datasheet

DocID15567 Rev 6 37/53
L99H01 Functional description of the SPI
52
4.5 Detailed byte description of status register (StatReg0)
The read operation starts always with the command byte followed by 1 data byte. The
content of the send data byte has to be ‘0’. The content of the addressed register is shifted
out at DO within the same frame (‘in-frame response’).
The device uses 1 status register to monitor the state of the device. Table 31 shows the
address and the content of the register.
Comments:
• DS_MON[3:0]: If max drain source voltage exceeds the defined thresholds, the
DS_MON are set and the corresponding drivers go to sink mode. The DS_MON bits
have to be cleared through a software reset to reactivate the drivers.
• OT_EXT: Depending on EXT_TS bit following two meanings exist:
– EXT_TS = low (active off):
TS/ACT_OFF pin is used as input to switch the H-bridge in tristate and back.
Details are discribed in Section 3.12.1.
– EXT_TS = high (thermal sensor interface):
TS/ACT_OFF pin is used as thermal sensor interface for external temperature
diodes. Details are discribed in Section 3.12.2.
• CP_LOW: If a charge pump output voltage low occurs, all gate drivers must be
switched-off (resistive low). The CP_LOW bit has to be cleared through a software
reset to reactivate the gate driver.
Table 31. Address 0<00(hex)>:StatReg 0 - read only
(1)
1. The errors of the status register are not linked to the <Global Error Flag>.
Bit 7 6 5 4 3 2 1 0
Name DS_MON_3 DS_MON_2 DS_MON_1 DS_MON_0 X X OT_EXT CP_LOW
<default> 0 0 0 0 0 0 0 0
Table 32. DS_MON - drivers relations
Register Deactivated driver
DS_MON_3 High-side 2
DS_MON_2 High-side 1
DS_MON_1 Low-side 2
DS_MON_0 Low-side 1