DPS368XTSA1 Datasheet, Pinout, Equivalents, and Specs
The DPS368XTSA1 is a miniaturized digital barometric air pressure and temperature sensor developed by Infineon Technologies. It is engineered for high-precision measurements with ultra-low current consumption, leveraging a capacitive sensing element for enhanced temperature stability. Housed in a robust, water-resistant 8-pin LGA package, the device is optimized for mobile, wearable, and IoT applications where space, power, and environmental resilience are critical design constraints.
Table of Contents
What is the DPS368XTSA1?
The Infineon DPS368XTSA1 is a high-resolution digital sensor capable of measuring both barometric pressure and temperature. Its internal architecture is based on a capacitive sensing principle, which provides high accuracy and stability across a wide temperature range, mitigating thermal drift common in other sensor types. The device integrates a 24-bit ADC for signal conversion and features an internal FIFO buffer that can store up to 32 measurements, allowing a host microcontroller to remain in a low-power sleep state for extended periods. Communication with the host is handled via standard I²C or SPI digital interfaces. Its target market includes smartphones, smartwatches, fitness trackers, drones, and smart home devices requiring precise altitude detection, weather monitoring, or indoor navigation capabilities. It is part of a broad family of environmental sensors. You can Browse Sensor Series to see related components.
Pinout Configuration and Packaging
The DPS368XTSA1 is supplied in a compact 8-pin HLGA (Holed Land Grid Array) package with dimensions of 2.0 x 2.5 x 1.1 mm³. The package design provides water resistance up to 50 meters (IPx8 rating). The pinout is optimized for straightforward integration onto a PCB.
- Pin 1 (SDO): SPI Serial Data Output. In I²C mode, this pin is used to set the LSB of the I²C address.
- Pin 2 (CSB): Chip Select for SPI interface (active low). Must be tied to VDDIO for I²C mode.
- Pin 3 (SDA/SDI): I²C Serial Data or SPI Serial Data Input.
- Pin 4 (SCL/SPC): I²C Serial Clock or SPI Serial Clock Input.
- Pin 5 (GND): Ground reference for the device.
- Pin 6 (VDDIO): Power supply for the digital I/O interface (1.2V - 3.6V).
- Pin 7 (GND): Ground reference for the device.
- Pin 8 (VDD): Main power supply for the sensor core (1.7V - 3.6V).
Core Architectural Features
- High-Precision Measurement: Achieves a relative accuracy of ±0.002 hPa, which translates to an altitude resolution of approximately ±2 cm, enabling precise vertical position tracking.
- Water and Dust Resistance: The sensor is housed in a robust package rated to IPx8, capable of withstanding water immersion up to 50 meters for one hour, making it suitable for wearables and outdoor devices.
- Low Power Consumption: Features multiple operational modes. In low-power mode, it consumes only 1.7 µA for pressure measurements at a 1 Hz sampling rate. Standby current is less than 0.5 µA.
- Integrated FIFO Buffer: Includes a 32-sample First-In, First-Out (FIFO) buffer that can store pressure and/or temperature readings. This allows the host processor to sleep and wake periodically to read buffered data, significantly reducing overall system power consumption.
- Flexible Digital Interfaces: Supports both I²C (up to 400 kHz) and 3/4-wire SPI (up to 10 MHz) communication protocols, providing design flexibility for interfacing with a wide range of microcontrollers.
Specifications Parameter Table
| Specification | Technical Details |
|---|---|
| Operating Pressure Range | 300 hPa to 1200 hPa |
| Relative Pressure Accuracy | ±0.002 hPa (equivalent to ±2 cm) |
| Absolute Pressure Accuracy | ±1 hPa (300...1100 hPa, 0...+65 °C) |
| Temperature Accuracy | ±0.5 °C (-40...+85 °C) |
| Supply Voltage (VDD / VDDIO) | 1.7V to 3.6V / 1.2V to 3.6V |
| Current Consumption (1 Hz Pressure) | 1.7 µA (Low Power Mode) |
DPS368XTSA1 Equivalents, Cross Reference, and Lifecycle
The DPS368XTSA1 is an active production component from Infineon with a stable lifecycle status. When considering alternatives, engineers often evaluate sensors like the Bosch Sensortec BMP388 or BMP390. While not pin-to-pin compatible due to different package layouts and pin assignments, the BMP388 offers similar functionality with high precision and a comparable I²C/SPI interface. The BMP388 is housed in a 10-pin LGA package (2.0 x 2.0 x 0.75 mm³), requiring a PCB layout modification. Key performance differences include variations in absolute/relative accuracy, power consumption profiles, and water resistance capabilities, where the DPS368XTSA1's IPx8 rating is a distinct advantage. Migrating from one to the other would necessitate driver software adjustments as register maps and calibration coefficient handling differ. For projects committed to the DPS368XTSA1, it is essential to verify component availability. You can Check DPS368XTSA1 Inventory & Pricing to ensure supply chain stability for your design.
Typical Application & Circuit Considerations
The DPS368XTSA1 is widely used in applications requiring precise altitude and environmental sensing. Common use cases include:
- Altitude Tracking: In drones, wearables, and portable navigation devices for accurate height stabilization and vertical speed indication.
- Indoor Navigation: Floor detection within multi-story buildings for enhanced location services where GPS is unavailable.
- Weather Stations: Localized barometric pressure monitoring for weather forecasting.
- Health and Fitness: Activity tracking, such as counting stairs climbed.
Video Demonstration
Frequently Asked Questions (DPS368XTSA1 FAQ)
Q: What is the purpose of the integrated FIFO buffer in the DPS368XTSA1?
A: The integrated 32-sample FIFO (First-In, First-Out) buffer allows the sensor to perform and store a series of pressure and/or temperature measurements without requiring immediate intervention from the host microcontroller (MCU). This enables the MCU to enter a low-power sleep mode for longer durations, only waking up periodically to read a batch of data from the FIFO. This system-level power-saving strategy is highly effective in battery-powered devices like wearables and remote IoT nodes, significantly extending battery life.
Q: How does the capacitive sensing element in the DPS368XTSA1 differ from piezoresistive sensors?
A: The DPS368XTSA1 uses a capacitive sensing element, where pressure changes cause a flexible membrane to move, altering the capacitance between two plates. This method is known for its high sensitivity and excellent temperature stability, as the capacitance change is less affected by thermal fluctuations. In contrast, piezoresistive sensors measure changes in electrical resistance of a material under mechanical stress. While also effective, piezoresistive sensors can exhibit higher temperature drift and typically consume more power, making the capacitive approach advantageous for high-precision, low-power applications.
Q: What are the considerations for selecting the oversampling rate (OSR) for pressure and temperature measurements?
A: The oversampling rate (OSR) determines how many raw measurements are averaged internally to produce a single output value. Selecting the OSR involves a direct trade-off between precision, measurement time, and current consumption. A higher OSR (e.g., 64x) reduces noise and increases precision but requires more time and consumes more current per measurement. A lower OSR (e.g., 2x) results in a faster measurement with lower power draw but at the cost of lower precision. The optimal OSR should be chosen based on the specific application's requirements for accuracy and power budget.
Q: Can the DPS368XTSA1 be used for underwater depth measurement?
A: Yes, within its specified limits. The DPS368XTSA1 has an IPx8 rating, meaning it is protected against water ingress up to a depth of 50 meters for one hour. To measure water depth, the sensor must be placed in a properly sealed housing. The sensor measures absolute pressure, which is the sum of atmospheric pressure and water pressure. Therefore, to calculate the relative water depth, the current atmospheric pressure must be measured first (or obtained from another source) and subtracted from the total pressure reading.
Q: What is the function of the VDDIO pin, and why is it separate from VDD?
A: The VDDIO pin provides the power supply for the sensor's digital input/output interface (I²C/SPI pins). It is separate from the main VDD pin, which powers the internal sensor core and analog circuitry. This separation allows the sensor to interface directly with a host microcontroller that operates at a different logic voltage level. For example, the sensor core can be powered by VDD at 1.8V, while VDDIO can be set to 3.3V to match the I/O voltage of a 3.3V MCU, eliminating the need for external logic level shifters.
Alan Carter
Senior Hardware Engineer & Component Specialist
Alan has over 15 years of expertise in embedded systems design, FPGA architecture, and global semiconductor supply chains. He specializes in component cross-referencing, lifecycle management, and helping OEMs navigate supply shortages.
