로드셀 앰프 -PGA302 모듈
(LOAD CELL 3 CLICK)
개요
- 본 제품은 로드셀 앰프 -PGA302 모듈입니다.
- 낮은 드리프트, 낮은 노이즈, 프로그래밍 가능한 신호 컨디셔너 PGA302 칩을 장착하고 있습니다.
- 다양한 resistive bridge-sensing 어플리케이션에 사용이 가능합니다.
- 2.5V bridge excitation 출력을 생성할 수 있으며, 전류는 최대 1mA까지 프로그래밍 할 수 있습니다.
- I2C 인터페이스를 가지고 있으며, 5V와 사용이 가능합니다.
특징
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Load Cell 3 Click as its foundation uses the PGA302, a high accuracy, low drift, low noise, low power, and versatile signal conditioner automotive grade-qualified device for resistive bridge pressure and temperature-sensing applications from Texas Instruments. The PGA302 provides bridge excitation voltages of 2.5V. The PGA302 conditions sensing and temperature signals by amplifying and digitizing through the analog front end chain and performing linearization and temperature compensation. The conditioned signals can be output in analog form, and, besides that, the signal data can be accessed by an I2C digital interface.
The PGA302 contains two separated analog-front end (AFE) chains with their gain amplifiers for resistive bridge and temperature sensing inputs. The resistive bridge input AFE chain consists of a programmable gain with eight steps from 1.33V/V to 200V/V. For the temperature-sensing input AFE chain, the PGA302 provides a current source that can source up to 1mA for the optional external temperature sensing available on the on-board terminal labeled with TMP+ and TMP-.
After the ADC decimation filters, the digitalized signals are sent to the linearization and compensation calculation digital signal logic. All required parameters for the linearization algorithm and other user data are stored in the integrated EEPROM memory. At the device's output, a 14-bit DAC is followed by a ratiometric-voltage supply output buffer with a gain of 4 V/V allowing a 0-5V ratiometric voltage system output available on the AN pin on the mikroBUS™ socket.
This Click board™ operates only with a 5V logic voltage level. The board must perform appropriate logic voltage level conversion before use with MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development.
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Type Force Applications Can be used for weight scale and force-sensing applications that use strain gauge load cells and other general resistive bridge signal-conditioning applications. On-board modules PGA302 - programmable signal-conditioner device designed for various resistive bridge-sensing applications from Texas Instruments Key Features Dual channel analog front-end, 16-bit Sigma-Delta ADC, programmable gain up to 200V/V, on-chip temperature sensor, EEPROM memory for device configuration, calibration and user data, and more. Interface Analog,I2C Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 5V