L9177 datasheet(31/49 Pages) STMICROELECTRONICS

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L9177

Functional description

Data in structure (LSB first)



Mask bit is used to mask serial command for diagnosis only readings on DOUT:

0 - Read Diag. All DIN bits are ignored.

1 - Write. All DIN are transferred into the internal registers.



Command bits are used to control the output drivers: (INJ1-2, O2H, RLY1-2-3, LAMP

and TACH) as described in following table:



VRS Diag bit is used active high to enable diagnostic phase of VRS block.



Programmable VRS Hysteresis: VRS hysteresis is programmable in 5 steps according

to Table 28: Data in VRS hysteresis.



Clear Diag, when set to 1 generates a request to clear those diagnostic flags which are

latched.



In addition odd parity bit (that is the last bit of the frame and includes in its calculation

the "Don't care" bits) is used for DIN word check together with falling clock edges

count.

Table 26. Data in (DIN) words content

DIN0

DIN1

DIN2

DIN3

DIN4

DIN5

DIN6

DIN7

Mask

LAMP_0

LAMP_1

VRS Diag VRS Hys0 VRS Hys1 VRS Hys2

DIN8

DIN9

DIN10

DIN11

DIN12

DIN13

DIN14

DIN15

INJ1_0

INJ1_1

INJ2_0

INJ2_1

O2H_0

O2H_1

RLY1_0

RLY1_1

DIN16

DIN17

DIN18

DIN19

DIN20

DIN21

DIN22

DIN23

RLY2_0

RLY2_1

RLY3_0

RLY3_1

TACH_0

TACH_1

Clear diag

Parity

Table 27. Data in command bits structure

xxx_1

xxx_0

Description

Turn-off driver / parallel polarity 0

Turn-on driver / parallel polarity 1

No change (the driver will maintain the previous condition)

Table 28. Data in VRS hysteresis

Hys 2

Hys 1

Hys 0

Description

Default hysteresis value

Hys VRS = 100 mV

Hys VRS = 200 mV

Hys VRS = 350 mV

Hys VRS = 650 mV

Hys VRS = 1000 mV

Not Valid (Hys doesn't change)

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