L9960T datasheet(18/95 Pages) STMICROELECTRONICS

18 / 95 page

Functional description

L9960, L9960T

18/95

DS11115 Rev 10

Functional description

4.1

Device supply

The L9960 is supplied through 3 pins connected to 3 different external voltage supply

sources:



VPS, battery voltage to supply the bridge,



VDD5, 5 V regulated voltage to supply chip digital I/O's,



VDDIO, the supplying SDO output buffer voltage.

4.1.1

Functional State

Following functional states are defined for L9960:



Normal Mode

–

supply voltages are present and no failure. H-bridge is driven by the selected

driving control mode (PWM/DIR, IN1/IN2) and it is configurable via SPI (i.e slew

rate, current limitation and overcurrent thresholds, OT warning thresholds).



Tri-state

–

H-bridge gate drivers are disabled due to a fault independently from PWM signal

(IN1 or IN2). Once the fault condition is disappeared, L9960 restarts working

without dedicated fault recovery procedure.



Disabled

–

H-bridge is disabled due to a fault condition and it is necessary to execute the

dedicated procedure to initialize the device (please review the below table for the

dedicated procedure for each fault). In case the fault is related to an overvoltage

or undervoltage on VDD5, the H-bridge is set to tri-state with NDIS low.

Note:

Please review the dedicated Section 4.8.1: Diagnostic Reset strategy in application note.

4.1.2

Vps power supply

VPS pin is the power supply of the H-bridge. A filter could be implemented, mainly to fulfill

the EMC requirements, and an over-voltage protection diode can also be added (optional).

Figure 6. External power supply circuitry

Controlled by MCU

Battery

Voltage

OPTIONAL

GAPGPS02312

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