CJMCU-1232 ADS1232 24-bit Analog-to-Digital Converter Board

CJMCU-1232 ADS1232 24-bit Analog-to-Digital Converter Board is a high-precision, industrial-grade measurement solution designed specifically for weigh scales and professional-level sensor digitization. This module utilizes the Texas Instruments ADS1232 chipset, which provides a complete front-end solution with a low-noise programmable gain amplifier (PGA) and a precision 24-bit Delta-Sigma ADC. Furthermore, the board features an onboard bridge power switch that helps reduce power consumption during idle periods by disconnecting the sensor excitation. Consequently, engineers can achieve highly accurate, flicker-free readings from load cells and pressure transducers even in electrically noisy environments. Therefore, you should choose the CJMCU-1232 for projects that demand ultra-high resolution and stable performance over a wide temperature range.

Key Features:

• High Resolution: The 24-bit Delta-Sigma architecture ensures exceptional precision for detecting minute changes in analog input signals.
• Low-Noise PGA: Includes an integrated programmable gain amplifier with selectable gains of 1, 2, 64, or 128 to match various sensor output levels.
• Two-Channel Differential Input: Supports two separate differential analog inputs, allowing the module to monitor multiple sensors simultaneously.
• Internal Temperature Sensor: Features a built-in sensor for temperature monitoring, which assists in compensating for thermal drift in sensitive measurements.
• Selectable Data Rates: Provides user-selectable output data rates of 10 SPS or 80 SPS, balancing between high-speed acquisition and superior noise rejection.

Technical Specifications:

• Resolution: 24-Bits
• Supply Voltage (AVDD/DVDD): 2.7 V to 5.3 V
• Full-Scale Differential Input: ±0.5 V_REF / Gain
• Common-Mode Rejection: 100 dB (Minimum)
• Noise Level: 17 nV at 10 SPS (Gain = 128)
• Integral Nonlinearity (INL): 0.0002%
• Operating Temperature: −40°C to +85°C

Mechanical Specifications:

• PCB Material: High-quality double-sided FR4
• Mounting Type: Through-hole header pins (2.54 mm pitch)
• Component Layout: Compact SMD arrangement to minimize parasitic interference
• Termination: Gold-plated pads for improved conductivity and corrosion resistance

Dimensions:

• Length: ≈ 23.5 mm
• Width: ≈ 16.0 mm
• Height: ≈ 3.0 mm (excluding header pins)
• Mounting Hole Diameter: ≈ 2.0 mm

Pinout and Wiring:

• DVDD/AVDD: Positive power supply inputs for digital and analog sections (typically 5 V or 3.3 V).
• GND: Ground connection for both power and signal reference.
• AINP1/AINN1: Positive and negative differential inputs for Channel 1.
• AINP2/AINN2: Positive and negative differential inputs for Channel 2.
• SCLK: Serial clock input for the digital interface.
• DOUT/DRDY: Data output and data-ready signal to the host microcontroller.
• GAIN0/GAIN1: Digital inputs used to configure the PGA gain level.
• SPEED: Digital input to select between 10 SPS (Low) and 80 SPS (High) data rates.

Datasheet Reference:

• Download Texas Instruments ADS1232 Datasheet

Commonly Used in:

• Digital Weighing Scales: Serving as the primary ADC for precision laboratory and retail scales.
• Industrial Process Control: Monitoring strain gauges, pressure sensors, and flow meters in automated factories.
• Scientific Instrumentation: Providing accurate digitization for high-sensitivity laboratory equipment.

Applications:

• Load Cell Digitization: Converting the millivolt signals from strain-based load cells into high-resolution digital data.
• Pressure Measurement: Interfacing with bridge-based pressure transducers for pneumatic or hydraulic systems.
• Thermal Analysis: Using the internal sensor to perform high-precision temperature logging.
• Smart Agriculture: Monitoring grain silo weights and liquid tank levels with long-term stability.

Equivalent Models:

• ADS1234: A four-channel version of the same architecture, however, it requires a larger footprint.
• HX711: A popular, lower-cost alternative for hobbyist scales, though it offers less configurability than the ADS1232.
• ADS1220: A similar 24-bit ADC that uses an SPI interface rather than the specialized bit-banged interface found on the ADS1232.

Package Includes:

• 1 x CJMCU-1232 ADS1232 24-bit Analog-to-Digital Converter Board
• 1 x Set of Male Header Pins