BA45F6846 - 8-bit LCD MCU with Piezo Horn Driver | Holtek
料号： BA45F6846 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.2 | $1.20 |
| 10 | $1.05 | $10.50 |
| 100 | $0.88 | $88.00 |
| 500 | $0.76 | $380.00 |
| 1,000 | $0.65 | $650.00 |
BA45F6846 概述
A microcontroller unit (MCU) is a single integrated circuit that combines a processor core, memory, and programmable peripherals into one chip, sitting at the heart of embedded systems within the broader hierarchy of semiconductor devices (MCU -> embedded processor -> integrated circuit -> semiconductor). The BA45F6846 belongs to Holtek's Battery A/D type 8-bit MCU family, which targets battery-powered sensing products.
Key features include Flash program memory for field updates, an integrated multi-channel 12-bit ADC for sensor signal acquisition, a built-in LCD driver capable of driving display segments directly, and a unique piezoelectric horn driver with boost converter that generates the high drive voltage needed for loud alarm sounders directly from a low battery voltage. This integration eliminates external driver and boost circuitry, reducing BOM count and PCB area in alarm products.
Architecturally, the device uses Holtek's proven 8-bit RISC core with efficient instruction set, low idle and sleep currents for long battery life, multiple timer modules, and comprehensive low-voltage and watchdog protection functions. The combination of analog front-end, display drive, and audio alarm drive on a single die is what distinguishes this family from generic 8-bit MCUs.
Typical applications include carbon monoxide (CO) alarms, combustible gas detectors, smoke/heat alarm combinations, and other battery-powered safety products where an LCD display and a loud piezoelectric sounder are mandatory requirements under safety standards regimes.
When designing with the BA45F6846, pay careful attention to sensor front-end grounding and the boost converter layout, as the horn driver switching currents can couple noise into sensitive ADC measurements if ground returns are shared.
This page synthesizes datasheet information, application context, and practical design notes not found together on distributor listing pages, with verified sources cited.
直接替换替代料： BA45F6846 ——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：
BA45F6845
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
BA45F6843
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
BA45F6746
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
BA45F6846 最大额定值与电气特性
| Core Architecture | 8-bit high performance RISC |
| Program Memory Type | Flash |
| Display Driver | Integrated LCD driver |
| Sounder Driver | Integrated piezoelectric horn driver with boost converter |
| Target Application | CO/Gas detector with LCD/LED display |
| 安装类型 | Surface Mount |
| Data Sheet Revision | V1.10 (June 07, 2023) |
BA45F6846 standard 引脚配置指南
BA45F6846（standard 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： BA45F6846.
请参阅 数据手册 以查看完整引脚配置。
典型应用
BA45F6846 适用于 6 应用s: Carbon Monoxide (CO) Alarms, Combustible Gas Detectors, Smoke and Heat Alarm Combinations, Battery-Powered LCD Instrumentation, Smart Home Safety Sensor Nodes, Industrial Portable Gas Monitors.
Carbon Monoxide (CO) Alarms
The BA45F6846 is explicitly designed by Holtek for CO detector applications, per its datasheet. A typical electrochemical CO alarm needs three subsystems: precise low-level sensor measurement, an LCD or LED indicator for ppm readout and status, and a loud piezoelectric alarm horn. The integrated A/D converter digitizes the sensor cell signal, the built-in LCD driver renders concentration and status directly, and the integrated boost converter plus horn driver generates the high-voltage drive a piezo sounder requires from a battery supply - all without external driver ICs. Placing the boost converter on-chip lets designers meet alarm loudness requirements while keeping quiescent current low enough for multi-year battery life, which is the central constraint in residential CO alarm products.
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Combustible Gas Detectors
Combustible gas detectors share the same architectural needs as CO alarms: a sensitive analog front end for the sensing element, a display, and a loud audible alarm. The BA45F6846 fits this application because its A/D converter conditions sensor signals while the integrated LCD driver and piezo horn driver with boost converter handle indication and alarm output, as stated in the Holtek datasheet. In practice the MCU runs a periodic sampling and threshold algorithm, updates the LCD with gas concentration, and triggers the horn driver through the boost stage when limits are exceeded. Integration reduces the component count on safety-certified boards, simplifying compliance documentation and lowering per-unit cost in high-volume detector manufacturing.
推荐
Smoke and Heat Alarm Combinations
Combination safety alarms that merge smoke, heat, or gas sensing benefit from the BA45F6846's single-chip integration of sensing, display, and sounder drive. The datasheet positions the part for CO/Gas detector products with LCD/LED display functions, and the same resource set - multi-channel ADC, LCD driver, and boost-driven piezo horn - maps directly onto combination alarm boards. The MCU multiplexes ADC channels across sensor types, manages mode indication on the LCD, and produces distinct alarm patterns via the horn driver. Because the boost converter is internal, the alarm loudness specification can be met from a single battery rail, supporting slim form factors typical of modern residential combination alarms without an external high-voltage sounder supply.
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Battery-Powered LCD Instrumentation
Beyond safety alarms, any battery-powered instrument that must show measured values on an LCD and emit an audible alert can use the BA45F6846 efficiently. The integrated LCD driver removes the need for a segment-driver IC or a character-LCD module, while the A/D converter reads bridge or ratiometric sensors. The piezo horn driver with boost converter provides alert tones without an external boost circuit - useful in portable gas monitors, level indicators, and threshold alarms. Holtek's 8-bit RISC core with low-power idle and sleep modes sustains long battery life, and Flash program memory allows field firmware updates during instrument calibration or regulatory re-certification cycles, reducing total cost of ownership across the product lifetime.
推荐
Smart Home Safety Sensor Nodes
Smart-home safety products - interconnected CO detectors, gas sensors, and alarm hubs - can adopt the BA45F6846 as the local sensing-and-indication controller. Its integrated LCD driver provides a local user interface even when network connectivity is down, an important fail-safe behavior in safety devices, while the integrated horn driver with boost converter guarantees local audible alarms independent of any wireless module. In a typical node, the MCU samples the sensor via its ADC, drives the LCD status display, sounds the piezo alarm, and signals an external RF module via GPIO or serial interface for cloud notification. This split - deterministic local alarm on-chip, connectivity delegated to a radio - matches certification expectations for residential safety devices.
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Industrial Portable Gas Monitors
Portable industrial gas monitors demand low power, robust analog acquisition, a readable display, and a loud alarm in a compact housing - precisely the BA45F6846's feature set. The multi-channel A/D converter samples catalytic or electrochemical sensor elements, the LCD driver renders concentration and battery status, and the boost-converter-driven piezo horn delivers alarm sound pressure in noisy industrial environments from a small battery pack. Flash memory supports per-customer calibration firmware and gas-specific compensation tables. Because display drive, sensing, and sounder drive share one die, the PCB can be sealed compactly for ingress protection, and the reduced BOM improves unit economics for handheld monitors produced in moderate-to-high volumes.
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推荐产品汇总
工程参考数据： BA45F6846 ——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 | BA45F6845 | BA45F6843 | BA45F6746 |
|---|---|---|---|---|
| Brand | Holtek Semiconductor | Holtek Semiconductor | Holtek Semiconductor | Holtek Semiconductor |
| Core | 8-bit RISC | 8-bit RISC | 8-bit RISC | 8-bit RISC |
| Program Memory Type | Flash | Flash | Flash | Flash |
| LCD Driver | Integrated | Integrated | Integrated | Integrated |
| Piezo Horn Driver with Boost Converter | Integrated | Integrated | Integrated | Integrated |
| Target Application | CO/Gas detector with LCD display | CO/Gas detector family | CO/Gas detector family | Battery alarm family |
关键差异点
- Single-chip integration of boost-converter horn driver （对比 BA45F6746)
- LCD display function integrated （对比 Generic 8-bit MCU (e.g., Holtek non-LCD A/D MCUs))
- Application-targeted resource set （对比 BA45F6843)
设计说明
The integrated boost converter that drives the piezoelectric horn switches significant current through its inductor. Keep the inductor, switch node, and decoupling loop physically small and return these currents via a dedicated ground path that joins the main ground at a single point. Do not share this return with the CO/gas sensor ADC front-end traces, or switching transients will appear as ADC noise and can cause false alarm thresholds. Follow the typical application circuit layout guidance in the Holtek BA45F6846 datasheet.
Battery life is the dominant constraint in CO/gas detector products. Use the device's sleep/idle modes aggressively: poll the sensor with periodic ADC conversions and wake the LCD and horn driver only on events or display refresh. Size the boost converter inductor and piezo load per the datasheet recommended values, since the peak horn-drive current sets the worst-case battery pulse load. Estimated: a boost stage drawing tens of mA during alarm versus microamps in sleep means battery pulse-rate capability, not capacity alone, must be checked in the cell datasheet.
This is an application-specific MCU: LCD segment configuration, horn-drive frequency, and ADC channel mapping are fixed by the die. Before committing a PCB, confirm the exact package pin count and pin map from the official Holtek BA45F6846 datasheet (revision V1.10, June 2023) rather than from family assumptions - pin assignments differ between BA45F family members even within the same package outline. Also verify Flash/RAM size fits your alarm algorithm plus LCD buffer before firmware freeze.
合规信息
Verified Web Data does not include explicit environmental compliance statements for BA45F6846. Consult the official Holtek datasheet/product page or request a material declaration from Holtek distribution.
