L9177ATR datasheet(29/55 Pages) STMICROELECTRONICS

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3.4.2

Data out (DOUT)

Status flags are sampled and sent out through DOUT pin at each R/W SPI operation. The structure of the 24 bit

word is described in Table 28. A three bits diagnosis is provided for stepper motor driver, a two bit diagnosis for

other drivers. VRS diagnosis is coded as '0' means No Fault, while '1' means Fault. Over temperature warning is

coded as '0' means No Fault, while '1' means Fault.

The SPI default value is: all bits set to zero.

Table 28. Data out (DOUT) words content

DOUT23

DOUT22

DOUT21

DOUT20

DOUT19

DOUT18

DOUT17

DOUT16

INJ1 Diag0

INJ1 Diag1

INJ2 Diag0

INJ2 Diag1

O2H Diag0

O2H Diag1

RLY1 Diag0

RLY1 Diag1

DOUT15

DOUT14

DOUT13

DOUT12

DOUT11

DOUT10

DOUT9

DOUT8

RLY2 Diag0

RLY2 Diag1

RLY3 Diag0

RLY3 Diag1

L Diag0

L Diag1

TACH Diag0

TACH Diag1

DOUT7

DOUT6

DOUT5

DOUT4

DOUT3

DOUT2

DOUT1

DOUT0

VRS Diag

Thermal Warning

Brdg1 Diag0

Brdg1 Diag1

Brdg1 Diag2

Brdg2 Diag0

Brdg2 Diag1

Brdg2 Diag2

Data out structure

Table 29. Two bits diagnosis (normal drivers)

Bit 0

Bit 1

Fault

No Fault

Short to Ground (OFF)

Open Load (OFF)

Overcurrent (ON)

Table 30. Three bits diagnosis (bridge stage)

Bit 0

Bit 1

Bit 2

Fault

No Fault

Short to Ground (OFF)

Short to VBAT (OFF)

Open Load (OFF)

Overcurrent (ON)

3.5

Diagnosis

The device provides a full set of diagnosis; deglitch timings listed below are digital, generated from internal clock

and their accuracy is guaranteed by scan patterns and clock measurement.

3.5.1

Voltage regulators thermal warning and shutdown

The 5V linear voltage regulator/tracking regulator is shut down when the thermal shutdown temperature is

reached and also the regulator is in current limitation. The shutdown is filtered with Tdcg filter of 30 µs ±25 %. As

soon as the over temperature disappears the regulator is switched on again. Over temperature flag without any

latch is present via SPI.

L9177A

Diagnosis

DS12175 - Rev 5

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