L99H02 datasheet(36/51 Pages) STMICROELECTRONICS

36 / 51 page

Functional description of the SPI

L99H02

36/51

DS12547 Rev 6

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 status of the device. Table 31 shows the

address and the content of the register.

Note:

The errors of the status register are not linked to the <Global Error Flag>.

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. In particular both gate

drivers of the faulty leg will be in sink mode until the DS_MON flag of one of its switch is

reset. The DS_MON bits have to be cleared through a software reset to reactivate the

drivers.



OT_EXT: Depending on EXT_TS bit, the 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 described 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 described in Section 3.12.1.



CP_LOW: if a charge pump output low voltage event occurs, all gate drivers are

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 clear

Bit

Name

DS_MON_3 DS_MON_2

DS_MON_1

DS_MON_0

X OT_EXT CP_LOW

Table 32. DS_MON - drivers relations

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

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