z8fmc16100 ZiLOG Semiconductor, z8fmc16100 Datasheet - Page 205

• Manufacturer Part Number: z8fmc16100
• Description: Z8 Encore Motor Control Flash Mcus
• Manufacturer: ZiLOG Semiconductor

Comparator and Operational Amplifier
PS024611-0408
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 is 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 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 non-inverting input and the
inverting (reference) input. If the voltage on the non-inverting input is higher than the
voltage on the inverting input, the comparator output is at a High state. If the voltage on
the non-inverting 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 GPIO pins. For more information, see
Alternate Functions
The comparator does not automatically power-down. To reduce operating current when
not in use, the comparator is disabled by clearing the
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
another on-chip comparator (if appropriate)
on page 34.
DD
Z8FMC16100 Series Flash MCU
CMPEN
– 0.1 V
DD
– 1 V
bit to 0.
Product Specification
Comparator Operation
GPIO
193