L9960 datasheet(60/95 Pages) STMICROELECTRONICS

60 / 95 page

Functional description

L9960, L9960T

60/95

DS11115 Rev 10

4.8

Diagnostics and registers descriptions in case of validity bit

configuration

A detailed diagnostic of the H-bridge is available through SPI communication.

The diagnostic words are used to report the following information:



H-Bridge failures,



H-bridge functional status,



H-bridge HWSC test result.

A detailed diagnostic is performed using a validity concept. The concept of the validity of the

diagnostic is to provide the information “diagnostic done” OR “diagnostic NOT done”.

4.8.1

Diagnostic Reset strategy

When diagnosis bits are latched, they can only be released by one of the following

conditions:



Transition from "Disable" (High) to "Enable" (Low) on DIS pin,



Diagnostic register read by SPI (see details on each failure release) depending on

"DIAG_CLR_EN" bit status,



Reset condition.

Usually, when the diagnostic register is reset, the bridge is switched back to normal mode

driven by DIR and PWM or IN1 and IN2. All the settings are kept as before the failure. In

case of SPI read, no additional action on DIS is needed.

When the diagnosis is combined with a protection of the driver (driver put into tri-state), a

reading by spi clears the diagnosis, but the bridge is released only at the next PWM rising

edge event.

Tionh

Ion threshold filtering time

Digital anti glitch filters on

rising edge (guaranteed

through scan)

123

µs

Tionl

Digital anti glitch filters on

falling edge (guaranteed

through scan)

123

µs

Ihyst

Current hysteresis on Ion

Tj = -40°C to +150°

0.4

0.5

0.6

Table 71. Over-current detection electrical characteristics (continued)

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

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