15

7903A – AVR – 2006/02

The digital input buffers are automatically disabled when sleep mode is entered except for

those pins used by the input signal to wake the MCU from a sleep mode. The DIDR

contributes to decreased overall power consumption.

Conclusion

At the end of the day, power consumption is about numbers and picoPower numbers

speak for themselves. The table below compares the leading low-power microcontrollers,

TI MSP430Fxxx and Atmel’s picoPower AVRs.

Power Save Current Consumption with 32 kHz Running

Device

Typical

2.2V @25°C

Maximum

2.2V @85°C

Comment

MSP430F435

1.1 uA

6 uA

With zero power BOR

MSP430F2131

0.8 uA

2.3 uA

With zero power BOR

ATmega165P

0.65 uA

NA

With Sleeping BOD

Power Down Current Consumption

Device

Typical

3.0V/5.0V @25°C

Maximum

3.0V/5.0V @85°C

Comment

78KO/Kx2 5.0V

NA / 1 uA

NA / 20 uA

3.0V numbers not available

R8C/tiny 3.0/5.0V

0.7 uA/ 0.8 uA

3 uA/ 3 uA

MSP430F4xxx

0.1 uA / NA

3.5 uA/ NA

Max 3.6V Vcc

MSP430F2xxx

0.1 uA / NA

1.9 uA/ NA

Max 3.6V Vcc

ATmega165P

0.1 uA / 0.6 uA

2 uA/ NA

5.0V numbers not available