Z8FS021 datasheet(21/68 Pages) ZILOG

21 / 68 page

PS028806-0315

Peripherals

ZMOTION® Intrusion Detection

Product Specification

The remainder of this section further describes the differences in application availability

between the 8-pin, 20-pin and 28-pin peripheral sets.

Analog to Digital Signal Conversion

Zilog’s PIR technology requires exclusive access to the ADC peripheral to detect motion.

However, ADC conversions can be requested by the application via the API (PIR Status/

Control Register 3). If it is necessary for the user application to utilize the ADC peripheral

directly, the PIR Engine must first be disabled via the PIR Engine Enable Register in the

API. Motion detection is not possible while the PIR Engine is disabled. When the user

application is finished with the ADC peripheral, it must reenable the PIR Engine.

8-Pin Device.

PA3 (ANA2) is reserved as the analog ADC input from the pyroelectric

sensor. Therefore, ANA2 is not available for user applications. Additionally, ANA3 is

used for a second sensor input in Dual Pyro Mode. All other channels are available to the

user application.

20-Pin Device.

PB2 (ANA2) is reserved as the analog ADC input from the pyroelectric

sensor. Therefore, ANA2 is not available for user applications. Additionally, ANA3 and

ANA6 are not available because PB3 (ANA3) must be tied directly to PC2 (ANA6/

VREF). PC2 is configured as VREF output by the PIR Engine. In Dual Pyro Mode, ANA3

is used for a second sensor input rather than being tied to VREF; ANA6/VREF therefore

becomes available. All other channels are available to the user application.

Low Power Op Amp

Not Available

Comparator

Available to application.

UART

Available to application –

No CTS.

Available to application.

Temperature Sensor

Not available.

LED Drive

—

Available to application.

WDT

Available to application.

ADC Channel

Available to Application

0Yes

Yes – used for White Light detection

2No

Only in Single Pyro Mode

Table 3. Peripheral Availability (Continued)

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