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CO/GAS Detector MCUs

29/10/2021

Holtek introduced new CO/GAS detector MCUs, the BA45F6830 / BA45F6840 / BA45F6850 series. The devices include a fully integrated CO/GAS detection AFE and a multi-level adjustable LDO. Compared with the previous BA45F67xx devices, these new devices have an increased voltage boost function which can boost the 2.2V~5.5V input voltage to 12V. This higher level voltage can be used by the integrated buzzer driver circuit to achieve a volume of 85dB over a distance of 3 meters. The devices are suitable for use in CO/GAS detection alarms with double terminal and three terminal buzzers.

The devices contain a 2K×16 / 4K×16 / 8K×16 Flash Program Memory, a 128×8 / 256×8 / 1024×8 RAM and a 32×8 / 128×8 / 256×8 EEPROM. With regards to peripheral features, the devices also include a 10-bit PTM, a 10-bit STM, a multi-channel 12-bit A/D converter as well as UART and SPI/I²C communication interfaces. The fully integrated CO/GAS detection AFE integrates the self-test and amplification circuits required by CO/GAS sensors. The temperature sensor can also be used for CO sensor temperature compensation. The boost and buzzer driver circuits can be used to implement a progressive increasing alarm sound, which greatly reduce the peripheral circuit components thus simplifying the product design. The devices are supplied in 24/28-pin SSOP and 48-pin LQFP package types.

Main Features

  • Operating Voltage
    - fSYS=2MHz: 2.2V~5.5V
    - fSYS=4MHz: 2.2V~5.5V
    - fSYS=8MHz: 2.2V~5.5V
  • Up to 0.5μs instruction cycle with 8MHz system clock at VDD=5V
  • Power down and wake-up functions to reduce power consumption
  • Oscillator types
    - External 32.768kHz Crystal – LXT
    - Internal Low Speed 32kHz RC – LIRC
    - Internal High Speed 2/4/8MHz RC – HIRC
  • Peripheral Features:
    -
    Flash Program Memory: 8K×16
    - Data Memory: 1024×8
    - True EEPROM Memory: 256×8
    - In Application Programming – IAP
    - Watchdog Timer function
    - 34 bidirectional I/O lines
  • Piezoelectric Horn Driver Feature
    - Input voltage (BDVDD): 2.2V~5.5V
    - Supports self-driving(3-pin) or external-driving(2-pin) buzzer
    - Integrated 12V boost converter
Documents Tech question
Holtek gas detector

CO/GAS Detector MCUs

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Holtek

Holtek Semiconductor is a leading professional IC design house in Taiwan having its major business activities focused in the area of microcontroller and peripheral component design.

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Documents

  • Holtek BA45 F6850 Datasheet
  • Holtek BA45 F6840 Datasheet
  • Holtek BA45 F6830 Datasheet
Pexels thisisengineering 3913017

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