Small AVR microcontroller with integrated boost converter, runs on single alkaline batteryDesigned by Azduino by Spence Konde in United States of America
Finally, the move is completed and we have connectivity at our new location I know I brought over the inventory to sell, but which box is it in? (orders will start shipping tuesday)
The ATtiny43 is a small AVR microcontroller manufactured by Microchip (formerly Atmel). It features an on-chip boost converter, which allows it to run from a single alkaline battery (ex, a basic AA b…Read More…
The ATtiny43 is a small AVR microcontroller manufactured by Microchip (formerly Atmel). It features an on-chip boost converter, which allows it to run from a single alkaline battery (ex, a basic AA battery) with just an external diode and inductor. This breakout board integrates those components, making this the ideal board for cases where you only have a single AA (or even smaller) to power your project. Arduino support is provided by ATTinyCore which I maintain.
|Flash (program memory)||4096b|
|Timers||2 x 8 bit|
|Special features||On-chip boost converter|
|Clock options||Internal 1/4/8MHz|
The boost converter will start up as long as the battery voltage is 1.2v or higher (in my testing, it seems to start at 1.1v), generating 3v. It will keep running as long as VBat is at least 0.8v, possibly even lower. It is capable of supplying 30mA to external devices as long as VBat > 1.0v (at lower VBat, the maximum current is lower - if overloaded, 3v output is not guaranteed)
Mainly, to lower power consumption, particularly if you intend to save power by keeping the MCU asleep most of the time. Because the boost converter is integrated with the microcontroller, it knows when the chip is sleeping, and enters "active low current mode" where the average current drawn is as low as 5uA (per datasheet at 1.0v battery voltage) - in this mode Vcc will vary, but without dropping so low that the chip resets or loses data.
Beyond that, simply finding a boost converter that will run from a single partly depleted alkaline battery is non-trivial - most of the low cost boost converters that fill ebay, aliexpress, banggood and the like usually require at least 2v, though there are a few that will take single-alkaline-battery voltages as input... But we are back to the quiescent current issue: Those converters are set for 3V or 3.3v, and have to maintain that voltage continuously - they don't have a way to know that the chip is sleeping, so they only need to maintain the voltage required to keep the RAM from losing data and the power-on-reset trigger from firing.
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