Z8FS040BSB20EG Zilog, Z8FS040BSB20EG Datasheet - Page 37

• Manufacturer Part Number: Z8FS040BSB20EG
• Description: IC MCU 4KB FLASH IRDA 8SOIC
• Manufacturer: Zilog
• Series: ZMOTION™r

Specifications of Z8FS040BSB20EG

• Applications: Infrared Motion Detection
• Core Processor: eZ8
• Program Memory Type: FLASH (4 kB)
• Controller Series: Z8 Encore! XP®
• Interface: IrDA, UART/USART
• Number Of I /o: 5
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Ram Size: -
• Other names: 269-2512

Address
Address
Address
PIR Process Rate (ePIR_Process_Rate)
PIR Process Rate (Bits 0-7)
Controlled by PIR engine
PIR Sample Size Register (ePIR_Sample_Size)
PIR Sample Size (Bits 0-7)
PIR Debounce Time Register (ePIR_Debounce)
PIR Debounce Time (Bits 0-7)
PS028506-1110
Control
Control
Control
Field
Field
Field
Bit
Bit
Bit
The PIR Process Rate Indicator is provided by the Engine to determine if the user application process
and interrupts overhead is impacting the performance of the Engine. If the Engine process rate drops
significantly, its ability to detect motion can be significantly reduced. This value is typically used at the
application development stage. This number gives an indication of how much CPU time the Engine is
receiving. Higher numbers are better. Generally, if the process rate drops below 0080h, the ability to
detect motion could be compromised.
Note: The 16 bit value provided by these two 8 bit registers must be read as an atomic operation by the
application. This can be ensured by either using the CPU’s ATM instruction or by disabling interrupts
while reading the two 8 bit registers.
Controlled by application
This register controls the amount of averaging that the engine performs on the incoming PIR signal ADC
samples. More averaging improves signal noise immunity at the cost of a slower sample rate.
Controlled by application
This register controls the amount of time that the engine will wait to fully debounce a motion signal.
Longer times result in detection of subtle motion at the cost of more potential false motion detections.
Valid range is from 01h to FFh.
15
7
7
14
13
6
6
12
F3H
11
5
5
10
PRELIMINARY
PIR Debounce Time
9
PIR Process Rate
PIR Sample Size
4
4
Read/Write
Read/Write
8
Read
F5H
F6H
7
ZMOTION
3
3
6
5
TM
Detection and Control Family
2
2
4
F4H
Product Specification
3
1
1
2
1
0
0
32
0