L9678P datasheet(126/215 Pages) STMICROELECTRONICS

126 / 215 page

Deployment drivers

L9678P, L9678P-S

126/216

DS11626 Rev 9

Figure 27. Deployment timer diagnostic sequence

Loop diagnostics control and results registers

Diagnostic tests and channels for each test are controlled through the Loop Diagnostic

Request Register (LPDIAGREQ), diagnostic results are stored in the Loop Diagnostic

Status Register (LPDIAGSTAT).

6.5.2

High level diagnostic approach

In this approach, the test steps described in the sections below are coded into a dedicated

state machine that helps reducing the user intervention to a minimum.

The high-level diagnostic commands are contained in the LPDIAGREQ, LOOP_DIAG_SEL,

and LOOP_DIAG_CHSEL registers. These settings are described in the SPI Table for these

commands in Read/write register.

The high-level diagnostic response is available in the LPDIAGSTAT register. These are

described in the SPI Table for this command in Read/write register.

The concept is depicted in the following figures.

GAPGPS01995

PT_WAIT

SSM_RESET /

PULSE_TESTx=0

From any state:

DIAG state & SPI_SYSREQ(DSTEST=PULSE) /

PULSE_TESTx=0

PT2

PT3

PT4

PT_TMR=8ms /

PT_TMR=0

PULSE_TESTx=0

PULSE_TEST2=1

PT_TMR=8ms /

PT_TMR=0

PULSE_TESTx=0

PULSE_TEST3=1

PT_OFF

PT_TMR=8ms /

PULSE_TESTx=0

PT_TMR=8ms /

PT_TMR=0

PULSE_TESTx=0

PULSE_TEST4=1

PT1

PT_TMR=8ms /

PT_TMR=0

PULSE_TESTx=0

PULSE_TEST1=1

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