Z8FMC04100 ZILOG [Zilog, Inc.], Z8FMC04100 Datasheet - Page 217

• Manufacturer Part Number: Z8FMC04100
• Description: Z8 Encore-R Motor Control Flash MCUs
• Manufacturer: ZILOG [Zilog, Inc.]

Comparator and Operational Amplifier
PS024604-1005
Comparator Operation
The Z8FMC16100 Series Flash MCU devices feature a general-purpose comparator and
an operational amplifier. The comparator is a moderate speed (200 ns propagation delay)
device that is designed for a maximum input offset of 5 mV. 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 (80 dB). 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:
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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
Alternate Functions
The comparator does not automatically power-down. To reduce operating current when
not in use, the comparator may be disabled by clearing the
Frequency compensated for unity gain stability
Input common-mode range from GND (0.0 V) to V
Input offset voltage less than 15 mV
Output voltage swing from GND + 0.1 V to V
Input bias current less than 1 nA
Operating the operational amplifier open loop (no feedback) effectively provides an-
other on-chip comparator, if appropriate
section on page 36 for more information.
P R E L I M I N A R Y
DD
Z8FMC16100 Series Flash MCU
– 0.1 V
DD
– 1 V
CMPEN
Product Specification
bit to 0.
Comparator Operation
GPIO
195