ST7MC1K2-Auto datasheet(294/371 Pages) STMICROELECTRONICS

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10.7

Operational amplifier (OA)

10.7.1

Introduction

The ST7 op-amp module is designed to cover various types of microcontroller applications

where analog signals amplifiers are used.

It may be used to perform a variety of functions such as: differential voltage amplifier,

comparator/threshold detector, ADC zooming, impedance adaptor, general purpose

operational amplifier.

10.7.2

Main features

This module includes:

●

1 stand alone op-amp that may be externally connected using I/O pins

●

Op-amp output can be internally connected to the ADC inputs as well as to the motor

control current feedback comparator input

●

Input offset compensation with optional average

●

On/Off bit to reduce power consumption and to enable the input/output connections

with external pins

10.7.3

General description

This op-amp can be used with three external pins (see device pinout description) and can

be internally connected to the ADC and the Motor Control cells. The gain must be fixed with

external components.

The input/output pins are connected to the op-amp as soon as it is switched ON (through

the OACSR register).

The analog input ports must be configured as input, no pull-up, no interrupt. Refer to the “I/O

ports” chapter. Using these pins as analog inputs does not affect the ability of the port to be

read as a logic input.

The output is not connected (HiZ) when the op-amp is OFF. However the pin can still be

used as an ADC or MTC input in this case.

When the op-amp is ON the output is connected to a dedicated pin which is not a standard

I/O port. The output can be also be connected to the ADC or the MTC. The switches are

controlled software (refer to the MTC and ADC chapters).

10.7.4

Input offset compensation

The op-amp incorporates a method to minimize the input offset which is dependant on

process lot. It is useable by setting the OFFCMP bit of the control register, which launch the

compensation cycle. The CMPVR bit is set by hardware as soon as this cycle is completed.

The compensation is valid as long as the OFFCMP bit is high. It can be re-performed by

cycling OFFCMP ‘0’ then ‘1’.

The compensation can be improved by averaging the calculation (over 16 times) setting the

AVGCMP bit.

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