Battery consumption and lifespan

DM50 System Power Consumption

Here’s a breakdown of the power consumption for the main components of the DM50:

  • STM32U5 110MHz: 2mA aprox
  • LCD: 320µA
  • REGULATOR: 18μA
  • RAM standby: 10µA

TOTAL: 2.0mA

STM32 Microcontroller Power Consumption:

  • STM32U073: 52 μA/MHz run, 16 nA off
  • STM32L072: 93 µA/MHz run, 860 nA off
  • STM32L151: 185 µA/MHz run, 440 nA off
  • STM32L451: 84 µA/MHz run, 22 nA off
  • STM32L4P5: 41 μA/MHz run, 22 nA off
  • STM32L552: 62 μA/MHz run, 17 nA off
  • STM32U535: 16 μA/MHz run, 90 nA off
  • STM32U575: 20 μA/MHz run, 160 nA off
  • STM32U595: 18 μA/MHz run, 150 nA off

As you can see, the STM32U5 stands out with its super-efficient active power consumption.

To make things even better, we’re working on some cool software tricks to minimize power usage, like auto shut-off, sleep mode, and reducing the MCU’s clock speed to 110MHz.

LiPO Batteries

Here are some LiPO battery options that could power up your calculator:

  • 750mAh: LP305048 3.0mm x 50mm x 48mm
  • 800mAh: LP304265 3.0mm x 42mm x 65mm
  • 900mAh: LP305060 3.0mm x 50mm x 60mm
  • 900mAh: LP305055 3.0mm x 50mm x 55mm
LP305060
LP305060 LiPO battery

Battery Life

Here’s a rough idea of how long different batteries will last, based on an average of 8 hours of usage per day:

  • 150mAh LiPO: 75 hours (9 days)
  • 900mAh LiPO: 428 hours (53 days)
  • 2000mAh (2xAAA): 952 hours (119 days)

So, with these estimates, you can pick the right battery to keep your calculator running as long as you need!