L9663 datasheet(21/106 Pages) STMICROELECTRONICS

21 / 106 page

DS11401 Rev 6

21/106

L9663

Power supply

105

If an overcurrent condition on PSIx is detected, the current limitation is active and after a

filter time tfilt a fault bit is set and the interface is shut off. In order to switch on again, the

interface must be first switched off by SPI and then switched on, as for over temperature.

The channels’ switch off by overcurrent can be disabled if the corresponding bits

STG_MASK for every channel are set in the SPI registers.

During start up, a configurable blanking time is implemented (128 µs/5 ms/10 ms, see

BLANKING_SEL bits in SPI register); during this time current limitation is active, even

though the interface will not shut off for overcurrent, thermal shutdown is always active, the

PSI5 receiver is disabled, and some fault flags are masked (short to battery, under voltage,

leakage to ground).

The quiescent current is monitored for minimum and maximum value, depending on the

range selected by SPI (CH1_CR1, QC_SEL bits). In failure case the corresponding bit in the

diagnostic register is set (SR2).

The voltage at PSIx is compared with VAS to monitor short to battery condition: if an over

voltage occurs PSIx is disconnected from VAS and the corresponding bit in diagnostic

(OLx in SR2) after a transient time.

Figure 10. Block diagram Transceiver 1

BH1

BL1

Cb1

ESD

protect

ion

Bootstrap 1

voltage generator for Vsync1

Vsync1

SYNC1

DOUT1

SYNC2

DOUT2

VGS

VAS

PSI1

PSI2

Sync-Pulse

Generator

Undervoltage

detection

Transceiver 2

BH2

BL2

Cb2

Bootstrap 2

Vsync2

VAS pre

regulator

Transceiver 1

Back-to-

Back

Switch

Manchester decoder #1

and data correction

voltage and

current limiter

(voltage switch)

Gate driver

Thermal Shutoff

Shutoff if V_psi1>Vas

SPI-Shutoff

Overcurrent-Shutoff

Data

Registers

GAPG1910151443PS

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