L9177 datasheet(32/49 Pages) STMICROELECTRONICS

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Functional description

L9177

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DocID17617 Rev 1

4.4.2

Data out

Status flag 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 29. A three bits diagnosis is provided for

stepper motor driver, a two bit diagnosis for others 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.

Data out structure

Table 29. Data out (DOUT) words content

DOUT0

DOUT1

DOUT2

DOUT3

DOUT4

DOUT5

DOUT6

DOUT7

INJ1 Diag0

INJ1 Diag1

INJ2 Diag0

INJ2 Diag1

O2H Diag0

O2H Diag1

RLY1 Diag0 RLY1 Diag1

DOUT8

DOUT9

DOUT10

DOUT11

DOUT12

DOUT13

DOUT14

DOUT15

RLY2 Diag0 RLY2 Diag1 RLY3 Diag0 RLY3 Diag1 LAMP Diag0 LAMP Diag1 TACH Diag0 TACH Diag1

DOUT16

DOUT17

DOUT18

DOUT19

DOUT20

DOUT21

DOUT22

DOUT23

VRS Diag

Thermal

Warning

Brdg1 Diag0 Brdg1 Diag1 Brdg1 Diag2 Brdg2 Diag0 Brdg2 Diag1 Brdg2 Diag2

Table 30. Two bits diagnosis (normal drivers)

Bit 1

Bit 0

Fault

No Fault

Short to Ground (OFF)

Open Load (OFF)

Overcurrent (ON)

Table 31. Three bits diagnosis (bridge stage)

Bit 2

Bit 1

Bit 0

Fault

No Fault

Short to Ground (OFF)

Short to VBAT (OFF)

Open Load (OFF)

Overcurrent (ON)

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