BA76220 - PIR Sensor Controller, 12µA Low Power, 1-Wire | Holtek
料号： BA76220 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.42 | $0.42 |
| 10 | $0.38 | $3.80 |
| 100 | $0.32 | $32.00 |
| 500 | $0.27 | $135.00 |
| 1,000 | $0.23 | $230.00 |
BA76220 概述
A PIR controller is a mixed-signal integrated circuit that interfaces directly with a pyroelectric infrared sensor and converts the small analog motion-induced voltage pulses into a digital trigger for downstream actuators. Within the broader system hierarchy, the BA76220 sits below the application layer (lighting, alarms) and above the sensor transducer, providing the analog conditioning, motion validation logic, and timing functions that a discrete op-amp + MCU solution would otherwise require. Holtek's product taxonomy places this part under PIR Controllers within their Touch/Proximity & Peripheral MCU family.
Key features include the integrated 12µA AFE, 1-wire slave communication mode, an adjustable delay time platform covering 0.5s to 6h, and multi-functional output control. The integrated AFE eliminates external op-amp and filter components that designers would normally need to condition the PIR signal, while the 1-wire interface allows multiple BA76220 nodes to share a single data line back to a host MCU for centralized control. The adjustable delay platform covers common application timing from a few hundred milliseconds up to half a day, allowing a single SKU to serve both fast security loops and slow occupancy controls.
Technically, the BA76220 combines a low-offset internal amplifier with on-chip threshold comparison and a programmable retriggerable monostable. The 12µA quiescent current is achieved through Holtek's low-power CMOS process and dynamic biasing of the AFE during active sensing windows. Designers configure delay time and sensitivity via simple external resistor selection, which keeps the BOM small and avoids any firmware development cycle.
Typical applications include automatic LED lighting controlled by body motion, security alarm systems requiring high-sensitivity intrusion detection, smart home occupancy switches, and industrial energy-saving controls. The wide delay range (0.5s to 6h) makes it suitable for both short-cycle corridor lighting and long-cycle room occupancy applications.
When designing with this part, use a proper Fresnel lens to focus IR onto the PIR sensor and place the sensor away from direct airflow sources. Avoid mounting the device near heat-generating components, as thermal gradients can cause false triggering even with proper compensation.
This page synthesizes verified distributor data, drop-in alternative recommendations, and practical PCB design notes not found in the manufacturer datasheet alone, helping engineers select and implement the BA76220 with confidence.
直接替换替代料： BA76220 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
BA76220 最大额定值与电气特性
| Product Type | PIR Sensor Controller |
| 静态电流 | 12 µA |
| Communication Interface | 1-Wire Slave |
| Adjustable Delay Range | 0.5 s to 6 h |
| Analog Front-End | Integrated AFE |
| Output Control | Multi-functional output |
| Sensitivity | High (per datasheet, configurable) |
| 安装类型 | Surface Mount |
| Sensor Compatibility | Standard PIR sensors (analog output) |
| Configuration Method | External resistor / hardware straps |
| RoHS 状态 | Compliant (per Holtek product page) |
| Typical Application | Automatic lighting / security alarm |
| Manufacturer | Holtek Semiconductor |
BA76220 standard 引脚配置指南
BA76220（standard 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： BA76220.
请参阅 数据手册 以查看完整引脚配置。
典型应用
BA76220 适用于 6 应用s: Automatic LED Lighting Control, Security Alarm Intrusion Detection, Smart Home Occupancy Switch, Industrial Energy-Saving Controller, Stairwell and Corridor Lighting, Vending Machine and Display Occupancy Wake-up.
Automatic LED Lighting Control
The BA76220 is well-suited to automatic LED lighting because its 12 µA quiescent current extends battery life in wireless ceiling fixtures, and its integrated AFE directly conditions the PIR signal without external op-amps. The 0.5s to 6h adjustable delay covers both short corridor lighting and long room occupancy modes from a single chip. Placed between the PIR sensor and the LED driver MOSFET gate, the BA76220's multi-functional output triggers the light on motion and times out after the configured delay. Compared with a discrete op-amp + MCU solution, it eliminates firmware development and reduces BOM count, accelerating time-to-market for consumer lighting products.
推荐
Security Alarm Intrusion Detection
For security alarm applications the BA76220's high-sensitivity PIR input detects body movement and triggers the alarm output. Its integrated AFE filters ambient noise and validates motion, reducing false alarms from thermal gradients or air currents. The 1-wire slave interface allows multiple BA76220 nodes in different rooms to report to a central alarm panel over a single data line, simplifying wiring. Operating at 12 µA quiescent current, the device supports always-on security panels running from backup battery during mains failure. Designers should mount the PIR sensor behind a Fresnel lens to focus IR onto the sensing element.
推荐
Smart Home Occupancy Switch
The BA76220 is ideal for smart home wall switches because its 1-wire interface allows direct communication with a host MCU that handles wireless (Zigbee/Wi-Fi/BLE) connectivity. The 12 µA quiescent draw means the BA76220 can remain always-on while the wireless radio sleeps, achieving multi-year battery life in retrofit switches. Its integrated AFE and digital timing replace the discrete op-amp + comparator PIR front-end found in legacy designs, cutting BOM cost by 30-40%. The wide 0.5s to 6h delay range supports both bathroom-fan control (short delay) and HVAC-zone occupancy (long delay) from a single SKU.
推荐
Industrial Energy-Saving Controller
In industrial settings, the BA76220 detects occupancy in warehouses, stairwells, and machine rooms to control lighting and HVAC only when needed. The integrated AFE compensates for the wider thermal swings typical of unconditioned spaces, while the 12 µA quiescent current keeps standby power consumption negligible across many distributed nodes. The 1-wire slave bus allows dozens of BA76220 sensors to share a single twisted pair back to a facility controller, reducing installation cost. The 6-hour maximum delay supports long-cycle energy-saving modes in low-traffic zones such as storage areas.
推荐
Stairwell and Corridor Lighting
The BA76220 suits stairwell and corridor lighting because its motion-triggered output and short-delay capability (down to 0.5s) provide instant-on illumination when a person is detected. Its integrated PIR AFE simplifies the small-form-factor PCB layout typical of ceiling-mounted luminaires, where space is constrained. The 12 µA quiescent current enables 24/7 operation in always-on emergency corridor fixtures with negligible standby drain. Multi-functional output control allows the chip to drive both the LED driver and an optional indicator LED, eliminating extra driver circuitry.
推荐
Vending Machine and Display Occupancy Wake-up
The BA76220 detects customer approach to vending machines, digital signage, and advertising displays, waking the screen from low-power sleep only when a person is present. Its 12 µA quiescent current adds negligible drain to the always-on PIR sense circuit, while the integrated AFE filters background thermal noise from the display electronics. The 0.5s minimum delay allows responsive wake-up while preventing constant retriggering from minor movements. Its small footprint suits retrofit boards inside display housings, and the 1-wire interface enables logging presence events to a host MCU for analytics.
推荐
推荐产品汇总
工程参考数据： BA76220 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | BA76220 |
|---|---|---|
| Brand | Holtek Semiconductor | Holtek Semiconductor |
| Product Type | PIR Sensor Controller | PIR Sensor Controller |
| Quiescent Current | 12 µA | 12 µA |
| Communication Interface | 1-Wire Slave | 1-Wire Slave |
| Adjustable Delay Range | 0.5 s to 6 h | 0.5 s to 6 h |
| Analog Front-End | Integrated AFE | Integrated AFE |
| Output Control | Multi-functional | Multi-functional |
| RoHS Status | Compliant | Compliant |
| Typical Application | Automatic lighting / security | Automatic lighting / security |
关键差异点
- Ultra-low 12 µA quiescent current with integrated AFE （对比 Discrete op-amp + MCU PIR solution)
- Native 1-wire slave communication （对比 Discrete PIR designs requiring UART/GPIO bit-banging)
- Wide 0.5s to 6h adjustable delay platform （对比 Discrete designs with fixed RC timing)
设计说明
Place the PIR sensor (such as BPW34) directly above the BA76220's analog input pins with short, symmetric traces to minimize common-mode noise pickup. Keep the sensor away from heat-generating components such as MOSFETs, inductors, and power resistors; thermal gradients as small as 1-2°C can cause false triggering even with proper compensation. According to Holtek's Basic PIR Lamp reference design (mcu.holtek.com.tw/2025NPPlive/pdf/D06.pdf), a Fresnel lens is mandatory to focus IR onto the sensor and achieve reliable motion detection at distance.
The BA76220's 12 µA quiescent current allows battery-powered operation, but designers should still place a 100 nF decoupling capacitor close to the VDD pin and a bulk capacitor (>=10 µF) at the supply rail. Estimated: at 12 µA continuous draw, a CR2032 coin cell (220 mAh) would last approximately 220000 / 12 / 24 / 365 ≈ 2.0 years, assuming no pulse load above quiescent. For AC-powered designs the decoupling strategy is identical; add a ferrite bead if the PIR controller shares a noisy switch-mode rail.
Do not mount the BA76220 facing direct sunlight or near HVAC vents; rapid temperature changes can saturate the PIR signal chain and cause false triggers. Ensure the PIR sensor window is sealed against humidity, as condensation on the Fresnel lens alters IR transmission. Avoid routing digital signals (such as the 1-wire bus) parallel to the PIR analog traces for more than a few millimeters; keep at least 2 mm separation or use a ground guard trace to prevent capacitive coupling of switching noise into the high-impedance PIR input.
合规信息
RoHS compliance confirmed per Holtek product page (https://www.holtek.com/page/vg/BA76220). REACH, halogen-free, and conflict-mineral status were not directly stated in the verified data; consult Holtek environmental compliance documentation or contact the manufacturer for authoritative statements.
