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AN1605 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN1605 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 7 page AN1605/0403 1/7 AN1605 APPLICATION NOTE USING AN ACTIVE RC TO WAKEUP THE ST7LITE0 FROM POWER SAVING MODE by Microcontroller Division Applications 1 INTRODUCTION This application note investigates the power consumption during the operation of a typical ap- plication which puts the MCU (ST7Lite0) in HALT mode and wakes it up at regular intervals by an external interrupt generated by an active RC circuit. It also lists the typical consumption values and the parameters on which this consumption de- pends. The internal Pull up (Rpu) of an I/O port is used for the active RC to minimise the number of external components. The value of the Rpu varies with the supply voltage of the MCU and with temperature. Externally, only one capacitor is used. The ST7LITE0 clock source is configured by option byte to be internal RC with PLL*8. All measurements are taken at ambient temperature. 1.1 HARDWARE SOLUTION Figure 1 shows the Hardware setup used to measure the consumption (IDD) at different power supply voltages. Figure 1. Hardware Setup 1.2 POWER CONSUMPTION The power consumption depends mainly on the time period between each wakeup from HALT (external interrupt interval). The wakeup time period is controlled by the RC time constant. The value of the Cext is fixed but the internal pull-up value varies with the MCU power supply voltage and with temperature. C EXT EI0 RPU VDD PA0 1 |
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