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L5953

Table 5. Diagnostic Register Description.

SUMMARY OF THE MAIN OPERATIONS

Operation A

s

Test Mode Diagnostic Procedure Start

s

1) WREN instruction (Fig.11)

s

2) WSTA instruction (Fig.12)

Operation B

s

Read the Diagnostic Register

Case1: after a Test Mode Diagnostic Procedure Start

1) RDIA instruction (Fig.13)

2) Diagnostic Register output (Fig.13)

s

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

Operation C

s

Write the Status Register

01

d7

Test mode

The Diagnostic Register is

referred to a test performed

during the normal working

of the L5953

The Diagnostic Register is

referred to a test performed

in Test mode

d6

HSD1W1

If d7=0: HSD1 in normal

condition;

If d7=1: bit value

meaningless

If d7=0: HSD1 is in

overcurrent

If d7=1: bit value

meaningless

d5

HSD1W2

If d7=0: bit value

meaningless;

If d7=1: HSD1 in normal

condition

If d7=0: bit value

meaningless

If d7=1: an open load is

present on HSD1

d4

HSD1W3

If d7=0: bit value

meaningless;

If d7=1: HSD1 in normal

condition

If d7=0: bit value

meaningless

If d7=1: HSD1 is shorted to

the supply voltage VDD

d3

HSD2W1

If d7=0: HSD1 in normal

condition;

If d7=1: bit value

meaningless

If d7=0: HSD2 is in

overcurrent;

If d7=1: bit value

meaningless

d2

HSD2W2

If d7=0: bit value

meaningless

If d7=1: HSD2 in normal

condition

If d7=0: bit value

meaningless

If d7=1: an open load is

present on HSD2

d1

HSD1W3

If d7=0: bit value

meaningless

If d7=1: HSD2 in normal

condition;

If d7=0: bit value

meaningless

If d7=1: HSD1 is shorted to

the supply voltage VDD

d0

Thermal Warning

Normal condition

Overtemperature protection

activated(Tj>150°C)