L99H01 datasheet(35/53 Pages) STMICROELECTRONICS

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L99H01

Functional description of the SPI

4.4

Global status byte

This byte is shifted out first at DO at every SPI access.

The GL_ER bit is present at DO with the falling edge of CSN.

This byte could be reseted with the command <clear status>.

Comments:

•

GL_ER: Global error flag. This signal is a logical OR among all the errors of all the

channels of the device.

•

FE: Frame error. If the number of clock pulses within the previous frame is not 16 the

frame is ignored and this bit is set.

•

STK_RESET_Q: If a stuck at ‘1’ on SPI_DI during any SPI frame occurs, or if a

power-on reset occurs. STK_RESET_Q is reset (‘1’) with any SPI command.

When STK_RESET_Q is active (‘0’), the gate drivers are switched-off (see Section 3.4:

Resistive low).

After a startup of the circuit the STK_RESET_Q is active because of the POR pulse

and the gate drivers are switched-off. The Gate drivers can only be activated after the

STK_RESET_Q has been reset with a SPI command.

•

TSD: Thermal shutdown due to an internal sensor. All the gate drivers and the charge

pump must be switched-off (see Section 3.4: Resistive low). The gate drivers can only

be activated after the TSD has been reset with a SPI command.

•

TW: Thermal warning

•

UV: Logical OR among the filtered undervoltage signals.

•

OV: Logical OR among the filtered overvoltage signals.

•

WDTO: Watchdog time out.

Failures of <Global Status Register>[8:14] are always linked to the <Global Error Flag>.

The <Global Error Flag> is generated by an OR combination of all failure events of the

device (<Global Status Register>[8:14]).

The flag is reflected via the DO pin while CSN is held low and no clock signal is available.

The flag remains as long as CSN is low. This operation does not cause the <communication

error> bit in the <Global Status Byte> to be set.

Table 30. STK_RESET_Q

Bit

Name

GL_ER

STK_RESET_Q

TSD

WDTO

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