Ultra Start 16xx Manual de usuario descargar pdf (Pagina 12)

MEB/0404

Thermometer w/ 10-Year Battery Life

0.8uA

0.8uA Standby

+ RTC

+ LCD

+ ADC

---------

2uA

MSP430F413

32768

Heat

Cool

Set

Hold

LoBatt

MSP430F413

32768

Heat

Cool

Set

Hold

LoBatt

A common application for MSP430 is a battery powered thermostat with display.

•The MSP430F413 system operates normally in standby mode LPM3 at ~0.8uA. When operating

in LPM3, the watch-crystal oscillator (ACLK), a timer, the LCD driver and all interrupts are active.

•Once every second, the timer clocked by ACLK overflows and interrupts the CPU, which

automatically starts the DCO. The CPU updates software based clock registers. Please keep in

mind that when active, the CPU is operating from the fast DCO – not the slower ACLK. The

update of the clock registers takes less than 100us.

•Because the active duty cycle for the embedded real-time clock function is so low taking only

about 100us every 1 second - 100/1000000 - the incremental current consumption is only 30nA.

•Every few seconds the MSP430F413 measures the resistance of a thermistor using an

integrated precision slope ADC. The temperature is calculated and displayed. Because the ADC

function occurs only every few seconds, the current impact is very low.

•Many other MSP430F413 resources are fully available for additional system features.

•The current consumption for the entire system including the MSP430, LCD and RTC and ADC

function is only 2uA.

•Because of the entire system’s ultra-low power consumption, the application can operate for 10-

years from a common coin cell battery.

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Ultra Start 16xx Manual de usuario Pagina 12