L9026 datasheet(13/60 Pages) STMICROELECTRONICS

13 / 60 page

Power supply

6.1

Overview

The L9026 is fed by two supply voltages:

•

VBATT (general supply for analog and digital part)

•

VDDIO (supply for digital and output buffers)

The supply lines are monitored against under voltage: in case under voltage condition is detected the IC reacts as

per the following:

•

An under voltage on VBATT supply voltage prevents the activation of the power stages.

•

An under voltage on VDDIO supply prevents any SPI communication and SPI read/write registers are reset

to default values.

The combination of the different under voltage conditions are reported in Table 7.

Table 7. Supply ranges

VDDIO ≤ VDDIO(UV)

VDDIO > VDDIO(UV)

VBATT ≤ VBATT_uv

channels cannot be controlled

SPI registers reset

SPI registers available

SPI communication not available

SPI communication possible

Limp Home mode not available

Limp Home mode available(channels are OFF)

VBATT > VBATT_uv

channels cannot be controlled by SPI (INn functionality

still available)

channels can be switched ON and OFF

SPI registers reset

SPI registers available

SPI communication not available

SPI communication possible

6.2

Battery supply (VBATT)

This pin is the general supply for analog and digital part unless an undervoltage condition is detected on VBATT.

In this case, provided VDDIO is still in range, the logic is supplied by the VDDIO itself. The Table 8 summarizes

the functional ranges dependent on battery supply voltage.

Table 8. VBATT electrical performance

Symbol

Parameter

Test condition

Min Typ Max Unit

VBATT

Supply Voltage Range for normal operations

3 V ≤ VDD ≤ 5.5 V

VBATT

Upper Supply Voltage Range for extended operations

3 V ≤ VDD ≤ 5.5 V

VBATT Low Voltage Low Voltage Range Cranking(1)

3 V ≤ VDD ≤ 5.5 V

1. Possible degradation of electrical parameters linked to battery line. Full functional operation will resume without operator

intervention when battery voltage returns to Normal Operating Voltage Range.

The device operates on 12 V system. Transient operation for these systems can reach 40 V maximum. Particular

care has to be taken in PCB manufacturing to keep thermal dissipation to a reasonable level.

•

For VBATT < VBATT(UV) the device is in a safety state (internal circuitries are on but all the outputs are off).

•

For VBATT up to 40 V all the functions are granted with increased power dissipation and no reset is asserted

during transient.

L9026

Power supply

DS13397 - Rev 5

page 13/60

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