L9374TRLF datasheet(40/80 Pages) STMICROELECTRONICS

40 / 80 page

Circuit description

L9374LF

40/80

DocID025414 Rev 1

over-temperature disabling the affected output. Hardware Enable (EN) is an external pin

and is controlled by the

C directly. FSOFF_ALL is a SPI command that provides a method

to shut down all outputs in one SPI command.

4.7.2

Diagnostics

Output stage diagnostics provide fault feedback information for the SPI status registers.

Gate monitoring

Qx_ON and Qx_OFF provide Gate voltage status history information. If the output DMOS

Gate voltage is above the Qx_ON threshold at any point between two SPI cycles the

Qx_ON output will latch on (‘1’) the SPI bit associated with that signal (bit 6 of status

registers 1 - 4). If the output DMOS Gate is below the Qx_OFF threshold at any point

between two SPI cycles the Qx_OFF output will latch on (‘1’) the appropriate SPI bit

associated with that signal (bit 7 of status of status registers 1 - 4). If an output is PWMmed

both Qx_ON and Qx_OFF will return a ‘1’ when read by the SPI. Upon reading status

registers 1 through 4 the Qx_ON and Qx_OFF bits are reset to ‘0’.

Conversely if the Gate voltage remains above or below the thresholds mentioned the status

bits Qx_ON or Qx_OFF will indicate only one state was present. At no time will both bit not

be set.

Freewheeling diode loss detection

Dx_Loss transmits to the SPI register latch a ‘1’ whenever the output protection clamping

structure is used. This notifies the SPI that the freewheeling diode, Dx, was not in the circuit.

According Figure 23 the Device Enable has a direct link to a separate discharge path on the

power gate. Only the high voltage clamp (Dx_loss) gets a higher priority, to protect the

DMOS from high voltage damage if the freewheeling diode is “lost”.

Table 34. Qx_ON and Qx_OFF provide gate voltage status history information

Condition

QX_ON

QX_OFF

duty: 100%

duty: 0%

duty: 0% < dc <100%

defect

Table 35. Output driver possible input configuration

FSOFF_ALL FSON_EN

ONX

Setpoints

Output Qx

(0=off, 1=on)

Remark

Q = on / PWM

like EN pin

Q = off

like EN pin

Q = on / PWM

1 or PWM

Q = off

Q = on / PWM

1 or PWM

Q = off

Q = on / PWM

Channel switched on without a sync-signal

Q = off

Channel switched on without a sync-signal

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