L99DZ81EP datasheet(45/62 Pages) STMICROELECTRONICS

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L99DZ81EP

SPI - control and status registers

Table 31. Global status byte

Bit

765

Name

GL_ER

CO_ER

C_RESET

TSD

UOV_OC_DS

Reset

001

GL_ER:

Global Error Flag.

Failures of bits 6 to 0 are always linked to the Global Error Flag. This flag is

set, if at least one of these bits indicates a failure. It is reflected via the DO

pin while CSN is held low and no SPI clock signal is applied. This operation

does not cause the Communication Error bit in the <Global Status> to be

set. The signal TW bit3 and OL bit1can be masked.

CO_ER:

Communication Error.

If the number of clock pulses during the previous frame is not 24, the frame

is ignored and this bit is set.

C_RESET:

Chip RESET.

If a stuck at ‘1’ on input DI during any SPI frame occurs, or if a Power On

Reset (VCC monitor) occurs. C_RESET is reset (‘1’) with any SPI command.

When C_RESET is active (‘0’), the gate drivers are switched off (resistive

path to source). After a startup of the circuit C_RESET is active due to the

power-up reset pulse. Therefore, the gate drivers are switched off. They can

only be activated after the C_RESET has been reset by an SPI command.

TSD:

Thermal shutdown.

All gate drivers and the charge pump are switched off (resistive path to

source). The TSD bit has to be cleared through a read and clear command

to reactivate the gate drivers and the chargepump.

TW:

Thermal Warning.

This bit can be masked using the configuration register.

UOV_OC_DS: Logical OR of the filtered undervoltage/overvoltage, chargepump-low,

overcurrent of the power outputs and the H-bridge drain-source monitor

signals.

OL:

Open-load.

Logical OR of the filtered output driver open-load signals. This bit can be

masked using the configuration register.

NR:

Not Ready.

After switching the device from standby mode to active mode an internal

timer is started to allow the chargepump to settle before the outputs can be

activated. This bit is cleared automatically after the startup time.

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