L9301 datasheet(38/54 Pages) STMICROELECTRONICS

Part #	L9301

Description	Automotive octal low side driver or quad low side plus quad high side driver

PDF	54 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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38 / 54 page

Clock monitor

L9301

38/54

DS11400 Rev 9

Clock monitor

For safety reasons the device has two clock signals: main clock and diagnosis clock.

The diagnosis clock is a redundant oscillator which has been introduced with the aim to

perform a frequency check with the main clock. A dedicated digital block is present to

accomplish this task.

If a clock signal is running out of range, a status bit is set (clkbad). In case the main clock

stops working, a digital internal reset is asserted, until POR or RES clears it.

If the main clock is running 25% faster or slower than diagnosis clock, the bit clkbad is set.

If the main clock is running 85% slower than diagnosis clock, a digital internal reset is

asserted, the device is put to reset state, all drivers are off and no response to any input

signal is given, until power off or RES pin assert (RES pin set to '0') to clear it.

5 V ≤ VB < 18 V; -40 °C ≤ Tj ≤ 175 °C unless otherwise specified.

Table 27. Clock monitor

Parameter

Test condition

Min.

Typ.

Max.

Unit

Main clock frequency

FLL not active

4.5

5.5

MHz

L9301 Datasheet(PDF) 38 Page - STMicroelectronics