ZUSBOPTSC01ZAC datasheet(217/402 Pages) ZILOG

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PS024604-1005

P R E L I M I N A R Y

Comparator Operation

Z8FMC16100 Series Flash MCU

Product Specification

195

Comparator and Operational Amplifier

The Z8FMC16100 Series Flash MCU devices feature a general-purpose comparator and

an operational amplifier. The comparator is a moderate speed (200ns propagation delay)

device that is designed for a maximum input offset of 5mV. The comparator can be used to

compare two analog input signals. General-purpose input pins (CINP and CINN) provide

the comparator inputs. The output is available as an interrupt source.

The operational amplifier is a two-input, one-output operational amplifier with a typical

open loop gain of 10,000 (80dB). One general-purpose input pin, OPINP, provides a non-

inverting amplifier input, while another general-purpose input pin, OPINN, provides the

inverting amplifier input. The output is available at the output pin, OPOUT.

The key operating characteristics of the operational amplifier are:

• Frequency compensated for unity gain stability

• Input common-mode range from GND (0.0V) to V

DD – 1V

• Input offset voltage less than 15mV

• Output voltage swing from GND + 0.1V to V

DD – 0.1V

• Input bias current less than 1nA

• Operating the operational amplifier open loop (no feedback) effectively provides an-

other on-chip comparator, if appropriate

Comparator Operation

The comparator output reflects the relationship between the noninverting input and the

inverting (reference) input. If the voltage on the noninverting input is higher than the volt-

age on the inverting input, the comparator output is at a high state. If the voltage on the

noninverting input is lower than the voltage on the inverting input, the comparator output

is at a low state.

To operate, the comparator must be enabled by setting the CMPEN bit in the Comparator

and Op Amp Register to 1. In addition the CINP and CINN comparator input alternate

functions must be enabled on their respective general-purpose I/O pins. Refer to the GPIO

Alternate Functions section on page 36 for more information.

The comparator does not automatically power-down. To reduce operating current when

not in use, the comparator may be disabled by clearing the CMPEN bit to 0.

ZUSBOPTSC01ZAC 数据表(PDF) 217 Page - Zilog, Inc.

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