L5953 datasheet(21/31 Pages) STMICROELECTRONICS

21 / 31 page

L5953

Summary of the main operations

21/31

Summary of the main operations

5.1

Operation A

●

Test mode diagnostic procedure start

●

1) WREN instruction (

Figure 13.)

●

2) WSTA instruction (

Figure 14.)

5.2

Operation B

●

Read the diagnostic register

Case1: after a test mode diagnostic procedure start

1) RDIA instruction (

Figure 15.)

2) Diagnostic register output (

Figure 15.)

Note:

An operation B must follow an operation A. The delay between the end of the operations A

to the start of the operations B must be longer than 100

μS

5.3

Operation C

●

Write the status register

1) WREN instruction (

Figure 13.)

2) WSTA instruction (

Figure 18.)

5.4

Operation D

●

Read the status register

1) RSTA instruction (

Figure 19.)

2) Status Register output (

Figure 19.)

5.5

Operation E

●

Diagnostic procedure start

1) WREN instruction (

Figure 13.)

2) WSTA instruction (

Figure 16.)

5.6

Operation F

●

Read the diagnostic register

Case 2: after a diagnostic procedure start

1) RDIA instruction (

Figure 17.)

2) Diagnostic register output (

Figure 17.)

An operation F must follow an operation E, if the IRQ pin is not activated. The delay

between Operation E and Operation F must be longer than 100

μs. To be recognized, the

fault must be present without interruptions, during all the delays mentioned. After an

Operation F, the bit s0 of the status register is reset (0)

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