L99H01 datasheet(37/53 Pages) STMICROELECTRONICS

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L99H01

Functional description of the SPI

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)

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

Bit

Name

DS_MON_3

DS_MON_2

DS_MON_1

DS_MON_0

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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