L99PM62XP datasheet(28/98 Pages) STMICROELECTRONICS

28 / 98 page

Description

L99PM62XP

28/98

Doc ID 16363 Rev 4

2.6

Reset output (NRESET)

If V1 is turned on and the voltage exceeds the V1 reset threshold, the reset output

“NRESET” is pulled up by internal pull up resistor to V1 voltage after a 2 ms reset delay time.

This is necessary for a defined start of the micro controller when the application is switched

on. Since the NRESET output is realized as an open drain output it is also possible to

connect an external NRESET open drain NRESET source to the output. It must be

considered that as soon the NRESET is released from the L99PM62 the Watchdog timing

starts.

A reset pulse (2 ms) is generated in case of:

●

V1 drops below Vrth (configurable by SPI) for more than 8 µs

●

Watchdog failure

Note:

An external pull-up resistor (1k

Ω) to V1 is recommended in order to ensure ILOAD1 > Icmp

during reset condition

2.7

Operational amplifiers

The operational amplifiers are especially designed to be used for sensing and amplifying the

voltage drop across ground connected shunt resistors. Therefore the input common mode

range includes -0.2 V to 3 V.

The operational amplifiers are designed for -0.2 V to +3 V input voltage swing and rail-to-rail

output voltage range.

All pins (positive, negative and outputs) are available to be able to operate in non-inverting

and inverting mode. Both operational amplifiers are on-chip compensated for stability over

the whole operating range within the defined load impedance.

The operational amplifiers may also be used to setup an additional high current voltage

source with an external pass element. Refer to Section 2.1.3 for a detailed description.

2.8

LIN bus interface

Features:

●

Speed communication up to 20 kbit/s.

●

LIN 2.1 compliant (SAEJ2602 compatible) transceiver.

●

Function range from +40 V to -18 V DC at LIN pin.

●

GND disconnection fail safe at module level.

●

Off mode: does not disturb network.

●

GND shift operation at system level.

●

Micro controller Interface with CMOS compatible I/O pins.

●

Internal pull up resistor.

●

Internal high-side switch to disconnect master pull-up resistor in case of short circuit of

bus signal.

●

ESD and transient immunity according to ISO7637 and EN / IEC61000-4-2.

●

Matched output slopes and propagation delay.

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