Z8FS021AHH20EG

Overview

The Z8FS021AHH20EG is an 8-bit microcontroller from the ZMOTION Intrusion Detection family, based on the eZ8 architecture. It features 2 KB of in-circuit programmable Flash memory for user application code and 256 bytes of RAM. The device operates at a maximum clock frequency of 20 MHz with a supply voltage range of 2.7 V to 3.6 V. It includes a Sigma-Delta ADC, full-duplex UART, two 16-bit timers, and up to 16 I/O pins depending on configuration. The MCU integrates a PIR Engine for motion detection algorithms.

Feature Summary

• Integrated ZMOTION PIR Engine for background motion detection processing
• White Light detection capability using status LED to eliminate CDS photocells
• Programmable pet immunity and sensitivity control via software API
• In-circuit programmable Flash allowing field firmware updates

Applications

• Passive Infrared (PIR)-based intrusion detection systems
• Security applications requiring motion detection with pet immunity
• Alarm systems utilizing white light anti-jam features

Procurement Notes

Verify the specific PIR engine revision identifier corresponding to the 'A' suffix in the part number against official documentation. Confirm that the generic source code RD0001-SC01 is downloaded and programmed into the MCU, as the device ships without preprogrammed application code.

Selection Notes

Select this component for designs requiring integrated PIR signal processing without external DSPs. Ensure the 20-pin SSOP package fits the PCB layout constraints. Verify compatibility with the required lens and pyroelectric sensor combinations, as API settings are optimized for specific hardware pairings.

Part Context

This part belongs to the Z8FS021 series within the ZMOTION family. It shares the base Z8F082A MCU architecture but includes locked memory regions reserved for Zilog's proprietary PIR technology. Other variants in the series include 8-pin SOIC and 28-pin SSOP packages with different GPIO counts.

Replacement Considerations

Direct replacements must support the same eZ8 core and PIR Engine integration. Verify pin compatibility for the 20-pin SSOP package. Note that standard Z8F082A devices lack the locked PIR code region and require separate implementation of motion detection algorithms.