For most of the SCM system, run as fast MCU, MCU in the work of a large number of waiting time of inactivity. In some cases, the system can achieve the same total waiting time over 95% of working time. Waiting process, the microcontroller without work, waiting for any progress, or to judge whether the cycle of external demand for news. In this process, allowing more internal microcontroller in sleep mode the circuit can significantly reduce energy consumption MCUs. Also allows the external circuit in sleep mode, so that the full range of products greatly reduced. This product is characterized by the design of micro-power non-continuous basic ideas, in addition, also according to the characteristics of the design details more drunk.

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Select the processor chip is the right of the key design of micro power

Present a variety of SCM, and most of the application of particular, specific applications can choose the appropriate microcontroller. The need for applications for micro-power, you can choose according to the following rules:

1. Chosen to minimize the external circuit microcontroller. With the rapid development of IC technology, the true single-chip system based microcontrollers has gradually become a mainstream product.

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2. Attention to the work of comparing current and rest. As the process is different from the MCU’s internal operating current, static current is not the same, or even a big difference. In selecting the MCU, not only to examine the work in progress, but also careful consideration of its current dormant state of rest.

3. For comparison, we can see, use a dedicated microcontroller for low power can be more flexible to control its power to meet the design requirements in the context of work insofar as energy mode economy.

4. Select the appropriate ROM, RAM. In general, the more memory the greater power. Meet the design requirements in the case, try using MCU internal ROM, RAM.

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5. Select the appropriate operating frequency clock. At a lower clock frequency, chip low power consumption single. MSP430F1121 For example, when working in the main frequency of 1MHz, under typical power consumption of 300uA, compliant and work under the main frequency of 4096Hz, the current 3uA only.

6. Select the appropriate number of pins I / O, and an appropriate display driver IO drive capacity and capability. The pin I / O microprocessor more, more power.

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7. Choose the right SCM, single chip to achieve a real sense, can save a lot of material development work and debugging, efficient, reliable operation, anti-jamming ability has been improved significantly, while allowing at costs below the system most suited to the miniaturization and portability, reducing energy consumption of the system has a decisive role.

Design strategies for low power

a. to the work of the internal circuit selectively

Overall, the design does not use all microcontrollers internal circuitry, and those who did not use the circuit to generate electricity. The need for applications for micro-power, you can subscribe to the Programming Tongguo neibu Gongneng special, choose from different function modules that do not use the function module Shi Qi Tingzhigongzuo, Jianshaojitong Wuxiaogonghao.

b. product design low voltage reduces energy consumption

Overall, the greater the MCU operating voltage, the transistor in the wider region in the working hours is longer, more energy consumption single chip. As the use of advanced manufacturing processes to SCM smart a wide voltage range of interest, as can be 1.8V ~ 5V supply voltage range of work. To reduce the energy consumption of the system, increase the use of low-voltage design.

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MCU power supply voltage range from relaxation, may further widen the application areas of SCM, particularly in portable and handheld safely use the battery as an energy source, does not care whether the curve of discharge voltage balance at low voltage will affect SCM work, not specifically because of increasing regulation circuit battery voltage, which greatly reduces energy consumption.