ZUSBOPTSC01ZACG datasheet(157/282 Pages) ZILOG

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PS022827-1212

P R E L I M I N A R Y

Comparator

Z8 Encore! XP® F082A Series

Product Specification

140

Comparator

The Z8 Encore! XP F082A Series devices feature a general purpose comparator that com-

pares two analog input signals. These analog signals may be external stimulus from a pin

(CINP and/or CINN) or internally generated signals. Both a programmable voltage refer-

ence and the temperature sensor output voltage are available internally. The output is

available as an interrupt source or can be routed to an external pin.

Operation

When the positive comparator input exceeds the negative input by more than the specified

hysteresis, the output is a logic High. When the negative input exceeds the positive by

more than the hysteresis, the output is a logic Low. Otherwise, the comparator output

retains its present value. See Table 141 on page 238 for details.

The comparator may be powered down to reduce supply current. See the Power Control

Because of the propagation delay of the comparator, Zilog does not recommend enabling

or reconfiguring the comparator without first disabling the interrupts and waiting for the

comparator output to settle. Doing so can result in spurious interrupts.

Figure 20. Comparator Block Diagram

CINP Pin

Temperature

Sensor

INPSEL

INNSEL

CINN Pin

Comparator

Internal

Reference

REFLVL

COUT

To Interrupt

Controller

Caution:

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