L9654 datasheet(42/59 Pages) STMICROELECTRONICS

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Functional description

L9654

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DocID14218 Rev 3

4.12.2

Deployment driver diagnostic mode response

Diagnostic mode response is defined as shown in table.

Table 27. MISO diagnostic mode response definition

Bit

State

Description

D15

Mode bits

D14

D13

SQH voltage below SBTH threshold

SQH voltage above SBTH threshold

D12

DEPEN Negated

DEPEN Asserted

D11

MOS Diagnostic Completed

MOS Diagnostic In-progress

D10

LS MOS Diagnostic selected

HS MOS Diagnostic selected

Diagnostic Current OFF

Diagnostic Current ON

Diagnostic Bias Current, IBIAS selected

Resistance Measurement Current, ISRC selected

SQL voltage above SGTH threshold

SQL voltage below SGTH threshold

AOUT/Comparator Channel Selection

Squib Current below VI_TH threshold

Squib Current above VI_TH threshold

Diagnostic Current: Channel Selection

SBTH threshold status flag (bit D13) indicates the state of SBTH comparator. SBTH

comparator monitors the voltage on SQH pin.

DEPEN status flag (bit D12) indicates the state of DEPEN pin.

MOS Diagnostic status flag (bit D11) reports the status of a driver diagnostic. This bit is not

latched. When a MOS diagnostic is completed, this bit is cleared. Low-side or high-side

MOS diagnostic status flag (D10) indicates if there is an on-going low or high-side driver

diagnostic. This bit shall be used in conjunction with bit D11.

Diagnostic current status flag (D9) indicates the state of diagnostic current. Bit D8 indicates

which diagnostic current is selected. This bit shall be used along with bit D9 to indicate if a

diagnostic bias current or resistance measurement current is on or off.

SGTH threshold status flag (bit D7) indicates the state of SGTH comparator. SGTH

comparator monitors the voltage on SQL pin.

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