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1、,The Solution for Battery Powered Measurement,超低功耗微控制器MSP430,Texas Instruments 超低功耗微控制器,讲座安排,1 MSP430是什么 2 MSP430特性 3 MSP430F2XX的优越性 4 开发工具IAR的使用,What is the MSP430?,The MSP430 family of ultra-low-power 16-bit RISC mixed-signal processors from Texas Instruments (TI) provides the ultimate solution fo
2、r battery-powered measurement applications.Using leadership in both mixed-signal and digital technologies, TI has created the MSP430 which enables system designers to simultaneously interface to analog signals, sensors and digital components while maintaining unmatched(无可比拟) low power. Typical appli
3、cations include utility metering, portable instrumentation, intelligent sensing, and consumer electronics.,Architecture,A 16-bit RISC CPU, peripherals and flexible clock system are combined by using a von-Neumann common memory address bus (MAB) and memory data bus (MDB). Partnering a modern CPU with
4、 modular memory-mapped analog and digital peripherals, the MSP430 offers solutions for todays and tomorrows mixed-signal applications.,Architecture,Key Features,Ultra-low-power architecture extends battery life: 0.1-A RAM retention (保持功耗) 0.8-A real-time clock mode 250-A/MIPS active Wide range of in
5、tegrated intelligent peripherals offloads（零负担） the CPU Modern 16-bit RISC CPU enables new applications at a fraction of the code size Complete development tools starting at only $20 Devices starting at $0.49,TI offers three distinct MCU product families optimized for different application segments.,
6、The C2000 family addresses the high end of the 32-bit MCU and low-end of the DSP market often called digital signal controller (DSC) combining DSP and microcontroller features on a single chip. The primary applications areas targeted are motor control and digital power supply. Up to 150 32-bit highq
7、uality DSP MIPS are offered.The TMS470 is based on an industry standard ARM7TDMI architecture and was developed originally for 32/16-bit automotive applications. The MSP430 family targets ultra-low power metering and measurement applications in the 8 and 16-bit market space. The product line offers
8、a wide range of catalog devices as well as application specific standard products (ASSP) solutions in the metering and portable nstrumentation. The product family is noted specifically for lower power with devices starting as low as $0.49.,The system enters and remains in an ultra-low power standby
9、mode as long as possible and is awoke only to service interrupts and then returns to standby mode quickly . This extended standby mode profile is common for many low-power applications that respond only to events once every few seconds,such as a thermostat or once every few hours such as a personal
10、medical device. To service interrupt driven events, the software efficiently uses the 16-bit RISC CPUs performance in very short, “burst” intervals. Transition from standby to full active is less than 1us.,Multiple oscillators are utilized to provide both an ultra-low power standby mode and “on-dema
11、nd” high performance processing.The clock system is flexible and allows the MSP430 to operate optimally from a single 32kHz crystal sourcing an always on low frequency Auxiliary Clock (ACLK) with no additional external components.The integrated high-speed DCO sources the master clock (MCLK) used by
12、the CPU and high-speed peripherals. By design, the DCO is active and fully stable in less than 1s with no intermediate steps.,The screen capture shows the actual startup of an MSP430 digitally controlled oscillator (DCO).In this example it can be seen that from an interrupt event, the DCO is active
13、and stable in well under 1s in this example the measured F2131 DCO startup time is actually 204ns.With the MSP430 clock start up is “instant-on”. With the DCO, no delay or 2-speed clock startup occurs.The users application has instant access to the high-speed DCO from any operating mode.,Application
14、 example,A common benefit of an instant-on and stable high-speed oscillator is response to serial communication,a UART for example. The clock source for the UART must start and be stable instantly to prevent received characters from being lost. If a slow or 2-speed oscillator is used, the first char
15、acter in the received data stream is lost.Instant-on saves power as the system does not have to waste energy waiting for oscillator startup. Events are serviced immediately.,So why is ultra-low power so important?,The most apparent benefit for low-power is realized in battery powered applications al
16、lowing the use of smaller, lower cost batteries.Power supplies are simpler and lower cost, and in many applications direct battery supply can be used.Generated EMI is very low because the MSP430 is so low power and can operate effectively at low frequencies.With the ability to operate 1A, products c
17、an operate from a single lithium battery for over 10-years.,The MSP430s 1uA ultra-low power stand-by mode or LPM3 capability allows and embedded real time clock function to be added to any application.In this example an MSP430F20x1 system normally in LPM3 at 0.8uA. Operating in LPM3 the watch crysta
18、l oscillator (ACLK), a timer, 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 operating from the fast DCO not the slower ACLK. The update of the clock registers takes less than 100us.,
