L9300 datasheet(155/178 Pages) STMICROELECTRONICS

155 / 178 page

17.2.3

Internal supply electrical characteristics

5.5 V ≤ VBATP≤ 19 V; -40 °C ≤ Tj ≤ 175 °C unless otherwise noticed.

All voltages refer to GND pin.

Table 64. Internal supply electrical characteristics

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

Oscillator monitor

fOSCINT_MON

Internal monitor Oscillator frequency

-7%

MHz

OSCMON_timeout

Timeout for stuck detection

Guaranteed by scan

7.6

8.5

µs

OSC_freq_error

Max tolerable delta between oscillators

Guaranteed by scan

-17

GND loss

t_an_chop_clock

analog chopping period

Guaranteed by scan

µs

GND, GND_A

t_GND_selftest

GND loss self test duration

Guaranteed by scan

µs

GND, GND_A

17.2.4

Internal supply error Handling

Table 65. Internal supply monitor error type

Type of error

Detection

condition

Action

Clear SPI flag

Restart condition

Main/Safety Oscillator Out

of frequency

On state

Power down sequence triggered with RES1-2

assertion. SPI fault bit Main Oscillator Self check

(15) set in SERVFLT register

Clear on read

Automatic restart with

retrigger of power-up

sequence after fault

disappears

GND loss self test fail

Power-up

Warning flag GND Loss Selftest (10) set in

TEMPSENS register

Clear on read N.A.

GND_A loss self test fail

Power-up

Warning flag GND_A Loss Selftest (11) set in

TEMPSENS register

Clear on read N.A.

17.3

Valve drivers

17.3.1

Solenoid driver

ADC check

Current monitor function in valve drivers is achieved by means of two independent current sense circuits, one for

the HS power stage and one for the LS power stage; their output is then MUXed to the ADC input to close control

loop and calibration loop in the digital domain. This check is performed to guarantee ADC functionality using a

safety reference in parallel to the main one; the check is available on demand selecting the corresponding bit in

solenoid CONFIGURATION registers. This self test can be activated only if the channel is tristated since the

current sense circuitry is inhibited during its actuation; solenoid ADC output and its reference are compared with

auxiliary independent circuits, in case the output of the two conversions differs more than ±13 LSB a flag is set in

the EXCEPTIONS register.

L9300

Functional safety

DS12258 - Rev 5

page 155/178

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