Product Description:

The CPS125 is a precision pressure sensor system-in-a-package (SIP) designed to deliver high accuracy and low power consumption. It combines a resistive bridge-type pressure sensor with a 24-bit ADC, offering high-resolution pressure measurements. The CPS125 features factory calibration for pressure and temperature, ensuring straightforward integration and use without the need for additional calibration by the host microcontroller.

Operation Modes

The CPS125 is factory programmed to operate in Sleep Mode by default. In this mode, the sensor remains inactive until it receives a Measurement Request (MR) from the master/host. Upon receiving an MR command, the CPS125 wakes up, performs a full measurement cycle, stores the measurement data in internal registers, and then returns to Sleep Mode.

I2C Interface

The CPS125 uses a two-wire I²C interface for reading sensor measurement data. The interface mode is selectable via the digital voltage level on the SS pin:

• SS = 1 or float → I²C Mode

If SS is set to 1 or not connected (internal pull-up at SS pin), the I²C mode is selected. The factory setting for the I²C slave address is 0x6C, and communication is restricted to this address only.

I2C Commands

• Measurement Request (MR): Wakes up the CPS125, performs a sensor measurement, stores the data in internal registers, and returns to Sleep Mode.
• Get Data (GD): Retrieves the sensor measurement data from the internal registers. Note that GD does not initiate a new measurement; it returns the last stored data.

The GD command follows the format of the 7-bit slave address with the 8th bit set to 1 (READ). The device sends an ACK to indicate communication success. The master controls the number of data bytes returned via NACK and stop conditions.

Physical Characteristics

• Size: 3 x 5 x 1.2 mm (W x L x H)
• Package: LGA, 8 Lead
• Sensing Port: Top side

Overview

The CPS125 system-in-a-package (SIP) solution consists of a resistive bridge-type pressure sensor and a 24-bit ADC, offering high-resolution and accurate pressure measurements. The digital output is fully calibrated for pressure and temperature, simplifying usage and integration.

Benefits

• Low Power Consumption
• Ideal for Battery-Powered Applications
• No External Clock Required
• High Resistance to Sensing Media

Features

• Factory Calibrated for Pressure and Temperature
• Supply Voltage: 2V to 5.5V (3V typical)
• Average Current Consumption: <5µA (one measurement)
• Sleep State Current Consumption: <200nA (25°C)
• Operating Temperature Range: -40°C to +85°C
• Pressure Absolute Accuracy: ±0.5 kPa (±5.0 mbar) @ 0°C to 50°C, 95 kPa to 105 kPa
• Pressure Relative Accuracy: ±0.05 kPa
• Temperature Accuracy: ±1.0°C
• I²C Interface: Up to 400kHz