L9300 datasheet(31/182 Pages) STMICROELECTRONICS

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8.4.3

VDD4 error handling

Table 13. VDD4 type errors

Type of error

Detection

condition

Action

Clear SPI flag

Restart condition

VDD4 under voltage

ON state

RES1 driven low. VDD4 UNDER VOLTAGE SPI flag

(7) latched in SERVFLT register

On read

Automatic after fault

disappears

VDD4 over voltage

ON state

RES1 driven low. VDD4 OVER VOLTAGE SPI flag (9)

latched in SERVFLT register

On read

Automatic after fault

disappears

8.5

TRK 1, 2, 3, 4

TRK1, TRK2, TRK3, TRK4 are four tracking regulators that can be configured to work also as wheel speed

interface depending on the voltage applied on TRK_SEL pin. All four regulators act as wheel speed interface

in case the TRL_SEL pin is grounded, otherwise each regulator tracks independently the voltage provided at

TRK_SEL pin (3.3 ≤ TRK_SEL ≤ 5) with a matching error of ± 20 mV. Since TRK outputs can be used to track

VDD3 or VDD4 voltages, their configuration is masked and they are kept disabled until both VDDx voltages are

above their undervoltage threshold to avoid wrong configuration detection during power-up. Once triggered the

configuration is latched and the echo of the configuration is provided in SPI registers.

8.5.1

Tracking regulator configuration

Functional description

Connecting TRK_SEL to either VDD3 or VDD4 output voltage or an external voltage reference the TRKn outputs

are configured as tracking regulators and start providing an output voltage in track with the desired reference. The

four TRKn outputs are however able to track only voltages starting from 3.3V.

TRK outputs are short to battery protected to avoid reverse current into VDD1 pin: in case the protection is

triggered a diagnostic bit is set in the dedicated SPI register.

An out of regulation comparator is implemented: this comparator senses when the internal current limitation

circuitry is activated to regulate properly the output voltage due to either a low drop condition or an overcurrent

condition. Once out of regulation condition is detected a flag is set in SPI registers and latched until read. The

diagnostic is not masked during power-up phase.

TRK regulators have a thermal protection with thermal sensors shared with VDD2 regulator. In case the

temperature threshold is reached and the out of regulation flag is set, only the regulator in fault condition is

turned off and a dedicated diagnostic bit is set. Once the sensed temperature is decreased below the shutdown

threshold plus a thermal hysteresis, the regulator is automatically turned on with soft start function. T_SD_TRK is

the bit that latches the thermal shutdown and it is cleared on SPI read.

L9300

TRK 1, 2, 3, 4

DS12258 - Rev 4

page 31/182

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