Description
This is the bigger brother of our popular Mini Ultra 8 MHz board. We added battery charging capability and with an on-board temperature monitoring but yet still ultra low power at 36.0 μA in power down mode!
Specifications:
- Compatible with Arduino IDE using “Arduino Pro Mini 3.3 V 8 MHz” as the board option
- Microcontroller – ATmega328P-AU
- Clock – External ceramic 8 MHz resonator
- Operating voltage – 3.3 V
- Low quiescent current (1.6 μA) on-board 3.3 V 250 mA regulator
- Ultra low power – Minimum 36.0 μA in power down mode
- 500 mA Li-Ion/Li-Pol battery charger
- System load sharing – Simultaneously power the system and charge the battery
- Voltage Proportional Current Control (VPCC) – Ensures system load has priority over battery charge current
- Thermal regulation – 0 to 45 Degree Celsius range to protect battery
- Battery charging status indicator LED:
- Power good (PG) indicator
- Charging status 1 indicator – Indicates charging process stages
- Charging status 2 indicator – Indicates charging process completeness and fault state
- External DC source range – 3.75 – 5.75 V (with over voltage protection up to 20 V and reverse polarity protection)
- Automatic power source selection through the battery charger IC
- On-board temperature sensor (MCP9700) connected to pin A7
- Battery voltage monitor connected to pin A6
- Indicator LED for power (can be disabled through solder jumper)
- Indicator LED connected to digital pin 13 through a MOSFET
- FTDI 6-pin header
- Auto-reset can be disabled through solder jumper
- Analog reference voltage with LC filter
- Dimension – 68.58 mm x 53.34 mm (2.7″ x 2.1″)
- RoHS compliant – Yes
Documentation:
Bruno Dionne –
What is the overvoltage protection effect if we put 6 volts on external DC source (min 3.37 volts max 5.75 volts),
What will the Ultra Mini do in this case? (Shutdown, overheat, impredictable behavior or else ) ?
– That would have damaged voltage regulator unfortunately.