BA45F6830 - CO/Gas Detector Flash MCU with Horn Driver | Holtek
MPN: BA45F6830 ✗ End of Life| Qty | Unit Price | Extended |
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BA45F6830 Overview
A CO/gas detector MCU is a specialized class of 8-bit flash microcontroller that combines sensing interfaces, alarm actuation drivers, and power management on one die. In the power-management hierarchy, this device spans voltage regulation (LDO), voltage boosting (boost converter for the piezo horn), and actuator drive (buzzer, LED, horn), reducing the bill of materials for safety-critical alarm products.
Key features include the integrated 12V piezoelectric horn driver fed by an on-chip boost converter, which allows alarm sounders to be driven directly from battery or low-voltage rails; a buzzer driver for secondary alert tones; a high-current LED driver for visual status indication; and programmable IOH output current. The Flash program memory supports multiple reprogramming cycles for field updates and manufacturing flexibility.
The device is an A/D-type 8-bit high-performance RISC flash MCU. Its analog front-end supports sensor signal acquisition for electrochemical CO cells and catalytic or semiconductor gas sensors, while the RISC core executes alarm-logic, self-test, and calibration routines. Holtek provides an EV chip (BA45V6830) with On-Chip Debug Support (OCDS) so the real MCU device can be debugged during development, and the EV chip and real device are almost functionally identical, easing the transition from emulation to production silicon.
Typical applications are standalone CO detectors, combined smoke/CO alarms, combustible gas detectors for kitchens and boilers, and portable gas warning devices where the horn driver, LED driver, and low-power MCU operation must coexist in one battery-powered product.
A key design consideration is the boost converter to 12V for the piezo horn: verify horn drive current and boost inductor selection against the datasheet, and budget battery capacity for periodic self-test alarm bursts.
This page synthesizes verified distributor and manufacturer data, lifecycle/EOL notices, and practical design guidance not found in a single datasheet, including drop-in replacement guidance as the device approaches its announced phase-out.
Drop-in alternatives for BA45F6830 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesBA45F6830 Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit high-performance RISC |
| Program Memory Type | Flash (multi-programmable) |
| Product Type | CO/Gas Detector Flash MCU |
| Horn Driver | 12V piezoelectric horn driver with on-chip boost converter |
| Buzzer Driver | Yes (integrated) |
| LED Driver | Yes (high current) |
| On-chip LDO | Yes |
| Output Current Setting | Programmable IOH |
| Debug Support | OCDS via BA45V6830 EV chip |
| Application Target | CO / Gas detector products |
| RoHS Status | unknown |
BA45F6830 standard Pin Configuration Guide
Pin configuration for BA45F6830 (standard package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for BA45F6830.
Refer to the datasheet for full pin configuration.
Typical Applications
BA45F6830 is suitable for 6 applications: Standalone CO Detector, Combustible Gas Detector, Combined Smoke/CO Alarm Platforms, Portable Gas Warning Devices, Domestic Boiler and Kitchen Safety Products, IoT-Connected Alarm Retrofit Modules.
Standalone CO Detector
The BA45F6830 fits standalone carbon monoxide alarms because it integrates every alarm function an electrochemical CO detector needs: an A/D front end to read the CO cell, an on-chip boost converter delivering roughly 12V to drive the piezoelectric horn, a buzzer driver for pre-alarm chirps, and a high-current LED driver for status and fault indication. In use, the MCU periodically samples the sensor, executes alarm-logic and self-test routines in Flash, then fires the horn directly from the boost output during a CO event. The trade-off versus a discrete design is that the boost and horn drive share battery current, so alarm burst duty cycle must be budgeted against battery capacity, especially near end-of-life when the low-battery chirp also loads the cell.
Combustible Gas Detector
For kitchen and boiler-room combustible gas alarms, the BA45F6830's A/D-type architecture reads semiconductor or catalytic gas sensor signals while its integrated power management keeps the board compact. The programmable IOH LED driver supports heater-status and alarm indication, and the 12V piezo horn driver produces the loud evacuation tone required by gas alarm standards. Because gas sensor heaters draw significant continuous current, the on-chip LDO and careful power sequencing in firmware matter: the MCU should warm up the sensor, stabilize readings, then enter low-power monitoring between samples. The multi-programmable Flash allows one hardware platform to be calibrated for methane, LPG, or combined CO/gas variants in production.
Combined Smoke/CO Alarm Platforms
Multi-sensor alarm products benefit from the BA45F6830's single-chip integration of sensing, alarming, and indication. The 8-bit RISC core has headroom for the alarm-logic interlock of two sensor channels (for example smoke plus CO), while the buzzer and horn drivers implement differentiated alarm patterns and the LED driver provides visual identification of the alarm source. Development is accelerated by the BA45V6830 EV chip with OCDS, which lets engineers debug the real application firmware in-circuit before production silicon is programmed. Design consideration: alarm patterns and interlock timing should be validated against the applicable alarm standards for each sensor type, and Flash endurance supports the firmware iterations this brings.
Portable Gas Warning Devices
Battery-powered portable gas detectors value the BA45F6830 because the on-chip boost converter and LDO let a low cell voltage serve both the logic and the 12V piezo horn without external power ICs, minimizing size and weight. The high-current LED driver and buzzer driver enable audible and visual alerts from the same IC. In practice the firmware alternates between low-duty sensor sampling and rare full-power alarm bursts; the dominant design constraint is battery sag during the horn burst, so verify the boost converter keeps horn sound pressure at specification when the battery is near end of discharge. Flash programmability supports per-unit calibration of sensor baselines on the production line.
Domestic Boiler and Kitchen Safety Products
Embedded gas-safety modules for boilers, hobs, and range hoods can use the BA45F6830 as the alarm controller: the A/D inputs monitor the gas sensor, the buzzer driver issues local pre-alarm warnings, the 12V horn driver provides the main alarm, and the LED driver interfaces with appliance status panels. The single-chip approach reduces the safety-critical BOM and simplifies certification of the alarm path because horn drive, boost, and logic come from one documented device. The trade-off is that appliance integrators must respect Holtek's EOL schedule - with the product termination effective 2026/01/03, long-lifecycle appliance platforms should qualify the replacement device named in Holtek's EOL notice from the start.
IoT-Connected Alarm Retrofit Modules
Retrofit alarm modules that add connectivity to existing detectors can pair the BA45F6830 (or its replacement) with a low-power wireless module: the MCU handles sensing, horn, buzzer, and LED duties while the radio module reports events upstream. The programmable IOH and Flash memory allow event-flag and threshold customization per installation. The engineering consideration is bus interfacing - the 8-bit MCU dedicates I/O to the wireless link, so pin budget must be checked against the datasheet pinout for the chosen package. For new connectivity-enabled designs, start from Holtek's replacement device to avoid an EOL core inside a product expected to live many years in the field.
Engineering reference data for BA45F6830 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Brand | Holtek Semiconductor |
| Core | 8-bit RISC Flash MCU |
| Horn Driver | 12V piezo with on-chip boost |
| Buzzer Driver | Integrated |
| LED Driver | High current, programmable IOH |
| On-chip LDO | Yes |
| Debug Support | OCDS via BA45V6830 EV chip |
| Lifecycle Status | EOL (termination effective 2026/01/03) |
Key Differentiators
- Fully integrated 12V piezo horn drive with on-chip boost (vs generic 8-bit MCU + discrete boost/driver stage)
- Single-chip alarm platform (LDO + buzzer + high-current LED with programmable IOH) (vs generic 8-bit MCU + separate regulator and driver ICs)
- OCDS on-chip debug via BA45V6830 EV chip (vs 8-bit MCUs without in-circuit emulation support)
Design Notes
The 12V piezo horn rail is generated by the on-chip boost converter. Estimate battery loading conservatively: if the horn requires tens of milliamps at 12V, the input current at a 3V battery is roughly 4x the horn current plus converter losses. Budget battery capacity for periodic self-test bursts, low-battery chirps, and the maximum continuous alarm duration required by the applicable alarm standard, and verify horn sound pressure remains in specification at minimum battery voltage.
Keep the boost converter loop (inductor, switch, output capacitor, ground return) compact and away from the analog sensor front end, because the horn-drive boost switches at high current and can couple noise into CO/gas sensor readings. Star-ground the sensor A/D path, and place the LDO output decoupling close to the MCU. Follow the layout guidance in the Holtek BA45F6830 datasheet and its typical application circuit.
The BA45F6830 is EOL: Holtek published a product termination notice effective 2026/01/03 and an EOL document (EOL_BA45F6830-V110.pdf) containing the phase-out schedule and cross reference to the replacement device. New designs must start on the replacement; existing designs should place last-time-buy orders early. Also note that debugging uses the BA45V6830 EV chip with OCDS - the EV chip is almost functionally identical but not the same silicon, so validate final behavior on the real device.
Compliance Information
Compliance status not stated in the verified data; Holtek published a restricted-products notice for BA45F6830 on its product page (announcement date 2025/10/03, effective 2026/01/03) - consult Holtek directly for current RoHS/REACH declarations.