Datasheet BA76220 (Holtek) - 8
| Manufacturer | Holtek |
| Description | PIR Controller |
| Pages / Page | 21 / 8 — BA76220. PIR Controller. CDS. CDS Pin. Status. Output. CDS Timing. CDS … |
| File Format / Size | PDF / 779 Kb |
| Document Language | English |
BA76220. PIR Controller. CDS. CDS Pin. Status. Output. CDS Timing. CDS Application Example. OUTPUT. OUTPUT Pin Can Drive LED
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BA76220 PIR Controller CDS
The CDS pin is connected to an internal comparator input. It is used to allow the device to distinguish between day and night conditions. When the CDS input voltage is less than VC, the PIR amplifier circuit will be disabled and the outputs of OUTPUT pin is inactive. When the input voltage of the CDS is greater than VC, the outputs are both active. The debounce time for the CDS pin for switching the output from an inactive to an active state is about less than 3 seconds. Connect this pin to VREG when this function is not used. The CDS timing is shown below. The VC comes from 6-bit DAC, the voltage changes is described in the following CDS register. The 6-bit DAC is shared with LVD.
CDS Pin Status Output
VCDS<VC Day Time Disabled VCDS>VC Night Controlled by PIR Output of CDS Comparator OUTPUT Inactive Active Inactive
CDS Timing
As shown below, RCDS and RY can be adjusted to obtain the desired day time detection level. VREG VREG RY CDS - Comparator VC + RCDS TEST/SC
CDS Application Example OUTPUT
The OUTPUT is a CMOS structure, acting as a valid trigger indicator. The high duration is controlled by the delay time oscillator and the MODE pin. The OUTPUT pin structure is shown below. OUTPUT 1kΩ LED Indicator
OUTPUT Pin Can Drive LED
Rev. 1.00 8 September 08, 2025 Document Outline Features Applications General Description Block Diagram Pin Assignment Pin Description Absolute Maximum Ratings Electrical Characteristics Functional Description TEST SC DT MODE CDS OUTPUT LVD Trigger Timing Retrigger LVD & CDS Detect Circuit The Criterion of LVD and CDS The Criterion of MODE Conditions for Disabling the PIR Amplifier Circuit Selection of OSC or DT Write ROM & Data Updated Communication Write/Read Value Protocol Registers PIR Amplifier Power-on Flow Application Circuits OTP-based Application Circuit RC-based Application Circuit Package Information 16-pin NSOP (150mil) Outline Dimensions
The CDS pin is connected to an internal comparator input. It is used to allow the device to distinguish between day and night conditions. When the CDS input voltage is less than VC, the PIR amplifier circuit will be disabled and the outputs of OUTPUT pin is inactive. When the input voltage of the CDS is greater than VC, the outputs are both active. The debounce time for the CDS pin for switching the output from an inactive to an active state is about less than 3 seconds. Connect this pin to VREG when this function is not used. The CDS timing is shown below. The VC comes from 6-bit DAC, the voltage changes is described in the following CDS register. The 6-bit DAC is shared with LVD.
CDS Pin Status Output
VCDS<VC Day Time Disabled VCDS>VC Night Controlled by PIR Output of CDS Comparator OUTPUT Inactive Active Inactive
CDS Timing
As shown below, RCDS and RY can be adjusted to obtain the desired day time detection level. VREG VREG RY CDS - Comparator VC + RCDS TEST/SC
CDS Application Example OUTPUT
The OUTPUT is a CMOS structure, acting as a valid trigger indicator. The high duration is controlled by the delay time oscillator and the MODE pin. The OUTPUT pin structure is shown below. OUTPUT 1kΩ LED Indicator
OUTPUT Pin Can Drive LED
Rev. 1.00 8 September 08, 2025 Document Outline Features Applications General Description Block Diagram Pin Assignment Pin Description Absolute Maximum Ratings Electrical Characteristics Functional Description TEST SC DT MODE CDS OUTPUT LVD Trigger Timing Retrigger LVD & CDS Detect Circuit The Criterion of LVD and CDS The Criterion of MODE Conditions for Disabling the PIR Amplifier Circuit Selection of OSC or DT Write ROM & Data Updated Communication Write/Read Value Protocol Registers PIR Amplifier Power-on Flow Application Circuits OTP-based Application Circuit RC-based Application Circuit Package Information 16-pin NSOP (150mil) Outline Dimensions