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
