Z8FS021 datasheet(59/68 Pages) ZILOG

59 / 68 page

PS028806-0315

Appendix A. Example Application Schematics

ZMOTION® Intrusion Detection

Product Specification

Z8FS021xHH20EG (20-Pin)

Examples of single and dual pyro circuit designs employing the 20-pin ZMOTION Intru-

sion Detection MCU are described in this section.

Single Pyroelectric Sensor

Figure 8 shows an example circuit for the 20-pin ZMOTION Intrusion Detection MCU

with a single pyroelectric sensor. The interface to the pyroelectric sensor is via the dedi-

cated input ANA2 (pin 2).

VREF (pin 18) must be externally tied to ANA3 (pin 3). This is considered Internal VREF

and bit 7 of PIR_ASC0 is set to '0' since it is being generated by the internal voltage refer-

ence. If an externally generated voltage reference is to be used, tie it directly to ANA3 (pin

3) and VREF (pin 18) and set bit 7 of PIR_ASC0 to '1'.

The status LED is driven by pin 1 (PB1/ANA1) which is normally configured as a GPIO

by the application to control the state of the LED. When White Light Detection is enabled,

the PIR Engine automatically reconfigures this pin to an ADC input to perform the neces-

sary ADC conversion and returns it to a GPIO when done.

Pin 15 is dedicated as the Debug pin and is connected to pin 4 of the Debug Header. Pin 14

is set up for the Reset function, but can also be used as PD0 (general purpose I/O) as the

application requires. Pull-up resistors (10K) are provided on the Debug and Reset signals

as required for the Debug interface. All other signals can be used as required.

The power supply design remains available to application requirements.

Figure 8. Example Circuit with the Z8FS021xHH20EG (20-Pin) ZMOTION Intrusion Detection MCU,

Single Pyro Mode

10K

VDD (3.3V)

VCC

RESET

GND

DBG

GND

Debug Header

Z8FS021xHH20EG

VDD

PB1/ANA1

ANA2

ANA3

PA0/T0IN/T0OUT/XIN

VSS

PA1/ T0OUT/XOUT

PA2/DE0

PA4/RXD0

PA3/CTS0

PB0/ANA0

PC3/COUT

PC2/ANA6/LED/V

REF

PC1/ANA5/CINN

PC0/ANA4/CINP

DBG

PA7/T1OUT

PA5/TXD0

RESET/PD0

PA6/T1IN/T1OUT

10K

VDD (3.3V)

1uF

47K

Pyro Electric

Sensor

VDD

GND

SIG

470

VDD (3.3V)

StatusLED &

White Light

Detection

Z8FS021 Datasheet(PDF) 59 Page - Zilog, Inc.

Z8FS021 Datasheet(HTML) 59 Page - Zilog, Inc.

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