L9396 datasheet(62/109 Pages) STMICROELECTRONICS

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General purpose output (GPO) driver

L9396

62/109

DS12539 Rev 10

General purpose output (GPO) driver

The device integrates one GPO driver operating in low-side mode. GPO driver can be used

in multiple ways, depending on application needs.

Default configuration uses the GPO output interface to map the internal RSUHx signal on

the GPOD0 pin. In this way, the decoded signal from the RSUHx sensor channel can be

output as voltage information on the GPO output, even without intervention of the

microcontroller. The following assignment matrix can be configured via SPI.

GPO driver can also be configured to operate in ON-OFF mode or in PWM mode setting the

desired duty cycle and frequency (128 Hz nominal) values through SPI register.

The default state of the driver is off. The driver can be activated via SPI.

The driver output structure is designed to stand -1V on its terminals and a +1V reverse

voltage across source and drain. The GPO driver is protected against short circuits and

thermal overload conditions. The driver is switched off if SSM_reset is asserted and the

driver automatically restarts when the fault is cleared.

The device also offers an open load diagnostics while in ON state.

Table 43. Assignment matrix configured via SPI

RSUH0

RSUH1

RSUH2

RSUH3

GPOD0_RSU_SEL

GPOD0

√

00 (default)

√

Table 44. GPO electrical characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Vsat

Output saturation

voltage

Vsat = VGPOD0 – GND;

IGPO0 = 70mA

0.5

IGPO_LIM

Current Limit

VGPOD0 – GND = 1.5V

145

IGPO_OC

Overcurrent

VGPOD0 – GND = 1.5V

145

GPO_ilim_oc_delta

Delta_Ilim_Oc

IGPO_LIM – IGPO_OC

0.1

IOpenLoad

Open load current

threshold

ON condition

ILKG_GPODx

GPO Output

Leakage Current

Vbattery=VGPOD0=19V;

GPO in OFF condition

-10

µA

Ireverse

Reverse current

VGPOD0 = -1V

OFF

condition

TJSD

Thermal Shutdown

175

200

THYS_TSD

All states off

°C

CGPO

Load capacitor

Design info

100

140

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