Texas Instruments PGA900 可编程电阻式感应调解器
德州仪器 PGA900 可编程电阻式感应调解器适用于多种传感元件类型。PGA900 通过两个模拟前端通道对其输入信号进行放大和数字化调节。凭借片上 ARM Cortex M0 处理器中的用户可编程软件，该器件可执行多种功能，如线性化、温度补偿等用户定义的校准补偿标定算法。经调节的信号可作为比例电压、绝对电压、4 至 20mA 电流环路或 PWM 输出。该器件还可以通过 SPI、I2C、UART 和 2 个 GPIO 端口访问数据和配置寄存器。此外，凭借独特的 OWI，该器件可以通过电源引脚进行通信和配置，无需使用额外线路。
特性
- High-accuracy, low noise, low power, small size resistive sensing signal conditioner
- User-programmable temperature and non-linearity compensation
- On-Chip ARM® Cortex® M0 microprocessor allows users to develop and implement calibration software
- One-Wire interface enables the communication through power supply pin without using additional lines
- On-Chip power management accepts wide power supply voltage from 3.3V to 30V
- Operating temperature range: -40°C to 150°C
- Memory:
- 8KB software memory
- 128 Bytes EEPROM
- 1KB Data SRAM
- Accommodates sensor sensitivities from 1mV/V to 135mV/V
- Two individual Analog-Front-End (AFE) chains, each including:
- Low noise programmable gain amplifier
- 24-bit sigma-delta Analog-to-Digital Converter
- Built-in internal temperature sensor with an option to use an external temperature sensor
- 14-bit DAC with a programmable gain amplifier
- Output options:
- Ratiometric and absolute voltage output
- 4- to 20mA current loop interface
- One-Wire Interface (OWI) over power line
- PWM output
- Serial Peripheral Interface (SPI)
- Inter-Integrated Circuit (I2C)
- Depletion MOSFET gate driver
- Diagnostic functions
应用
- Pressure sensor transmitter
- Transducer
- Liquid level meter
- Flow meter
- Weight scale
- Load meter
- Strain gauge
- Thermocouple
- Thermistor
- 2-Wire Resistance Thermometer (RTD)
- Resistive field transmitter
Simplified Block Diagram
Additional Resources
发布日期: 2015-08-12
| 更新日期: 2023-10-31