TI公司的AFE4110是基于超低功耗MSP430 RISC处理器,配置有两个16位计时器,48段LCD驱动器,可编程模拟池,电源监视器和基准电压源,特别适合采用单颗SR60电池的低成本数字温度计,工作电压1.1V-1.55V,3mA 1.85V内部电荷泵用于外接EEPROM和内部LCD驱动器,工作时功耗45µA/MHz (1.55V),深度睡眠功耗小于0.4µA,主要用于数字温度计,计步器,温度调节器和其它手持设备.本文介绍了AFE4110主要特性,功能框图,AFE4110温度计演示板主要特性,电路图,材料清单和PCB元件布局图.
The Texas Instruments MSP430 family of low-power mixed signal ASSPs consists of many devices featuring different sets of peripherals targeted for various consumer medical applications. The AFE4110 CPU architecture is based on the popular ultra low power Texas Instruments MSP430 RISC processor.
The AFE4110 configuration with two 16-bit timers, integrated 48-segment LCD driver, programmable Analog Pool, supply voltage monitor and internal reference voltage source is particularly well suited for implementation of low cost digital thermometers operating from a single cell SR60 battery. The capability to correct the on chip high frequency oscillator output facilitates the generation and measurement of real time intervals. For many applications, this capability allows system designers to eliminate a clock crystal from the system BOM.
AFE4110主要特性:
Ultra Low Supply-Voltage (ULV) Range
1.1V - 1.55V Unregulated Single Cell Battery Operation(CPU, System Core, and Timers)3mA 1.85V Internal Charge Pump for External EEPROM (R/W),VDDIO, and Internal LCD Controller
60µA 3.3V Regulated Charge Pump for LCD Drive Pads
Low Power Consumption
Active Mode (AM): 45µA/MHz (1.55V)
Standby Mode (LPM3, LCD): < 25µA
Deep Sleep Mode (LPM5):<0.4µA
8-Bytes Battery Backed RAM for Calibration Retention
Wakeup From Periodic Timer or External Interrupt
Wake-Up from LPM5 in 10ms, Wake-Up from LPM4 in 5µs
16-Bit RISC Architecture
Extended Instructions
125ns Instruction Cycle Time
Compact Clock System
Internal Trimmable High Frequency Clock Oscillator with
Discrete Frequency Selections Between 1MHz and 5.4MHz
20kHz Internal low Frequency Clock Oscillator
External Clock Input (Upto 8MHz)
32kHz Crystal Oscillator
Internal High Frequency Oscillator Frequency Correction
Facilitates Generation and Measurement of Real Time
Intervals Without a Clock Crystal
Utilizes Factory Calibration (E-Fuse), S/W, and a
Single External 1Mύ Resistor
Integrated LCD Controller
Drives 4-Mux, 3-Mux, 2-Mux, or Static Mode LCDs
Up to 48 (4x12) LCD Segments
Two 16-Bit Timer0_A3 with Three Capture/Compare Registers
Extended Input Multiplexer for High Accuracy RC
Discharge Measurement
ULV Analog Pool
8-Bit Analog-to-Digital Converter (ADC) |