Z8FS021 Datasheet, PDF(59/68 Page) Zilog, Inc. – Select from an assortment of lenses and pyroelectric sensors to best fit your application

English

English German Russian Spanish Italian Polish Chinese Japanese Korean French Portuguese	Language :

Z8FS021 Datasheet, PDF (59/68 Pages) Zilog, Inc. – Select from an assortment of lenses and pyroelectric sensors to best fit your application

◁

ZMOTIONÂ® 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.

VDD (3.3V)

1uF

Pyro Electric

Sensor

VDD

VDD (3.3V)

SIG

47 K

GND

1 uF

470

StatusL ED &

White Light

De tection

1 PB1/ANA1

PB0/ANA0 20

2 ANA2

PC3 /COUT 19

3 ANA3

4 VDD

PC2/ANA6/LED /VR EF 18

PC1/ANA5/CINN 17

5 PA0/T0IN/T0OUT/XIN PC0/ANA4 /CINP 16

6 PA1/ T0 OUT/XOUT

DBG 15

7 VSS

RESET/PD0 14

8 PA2/DE0

PA7 /T1OUT 13

9 PA3/CTS0

PA6/T1IN/T1OUT 12

10 PA4 /RXD0

PA5 /TXD0 11

Z8FS021xHH20EG

VDD (3.3V)

10 K

10K

Debug Header

1 VCC

2 RESET

3 GND

4 DBG

5 GND

6 NC

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

Single Pyro Mode

PS028806-0315

Appendix A. Example Application Schematics

▷