Holtek application specific microcontrollers for CO/Gas detection:
The BA45F6846 / BA45F6856 series includes an analog front-end for this application. In addition to the analog front-end (AFE), these microcontrollers offer various other interesting peripherals – details below.
The AFE offers various possibilities for adaptation to the sensor element. It contains an operational amplifier to preprocess the signal before the ADC.
The supply voltage for the OPA can be the operating voltage or a voltage stabilized by an internal LDO. The AFE can be fed internally, directly to the ADC. The output of the integrated temperature sensor of the BA45F6846 / BA45F6856 microcontrollers can also be connected directly to the ADC to acquire temperature values for compensation, in addition to the measured value. It is also possible to use the reference voltage of the T-sensor in the ADC.
With a typical current consumption at 3V in sleep mode with activated watchdog of typ. 1.5µA (and 10µA in SLOW active mode – 32KHz) monitoring tasks are well supported. Universal serial interfaces (I2C, SPI, UART), as well as different timer modules, are available to support applications in the measurement range. Furthermore, smaller LC displays can be used directly with the integrated 12×4 display driver.
The BA45F6846 / BA45F6856 microcontroller series extends Holtek’s range of products designed for sensor implementation. In addition to these basic products, Holtek also offers ready-made sensor modules such as PIR or distance sensors.
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