BMP388

Part: BMP388 — Bosch Sensortec

Type: Digital pressure sensor

Description: The BMP388 is a digital pressure and temperature sensor housed in a compact 2.0 × 2.0 × 0.75 mm³ metal-lid LGA package, offering a wide measurement range of 300-1250 hPa and low power consumption of 3.4 μA at 1 Hz.

Operating Conditions:

• Supply voltage: VDD 1.65–3.6 V, VDDIO 1.2–3.6 V
• Operating temperature: -40 to +85 °C
• Operating pressure range: 300–1250 hPa

Absolute Maximum Ratings:

• Max supply pin voltage: 3.8 V
• Max storage temperature: +85 °C
• Overpressure survivability: 2,000,000 Pa

Key Specs:

• Relative accuracy pressure: typ. ±0.08 hPa (900–1100 hPa, 25–40 °C)
• Absolute accuracy pressure: typ. ±0.50 hPa (300–1100 hPa, -20–65 °C)
• Current consumption (1 Hz pressure and temperature): 3.4 μA
• Sleep current: 2 μA (VDD=VDDIO 1.8-3.6V)
• Noise in pressure (lowest bandwidth, highest resolution): 0.03 Pa
• Absolute accuracy temperature: typ. ±0.3 °C (@25 °C)
• Long term stability: typ. ±0.33 hPa (12 months)
• Max sampling rate: 200 Hz

Features:

• Digital interface: I²C (up to 3.4 MHz) and SPI (3 and 4 wire, up to 10 MHz)
• Built-in IIR filter
• Three power modes: sleep, forced, and normal
• Oversampling settings for pressure and temperature (0 to 32 times)
• Interrupt functionality (Data ready, watermark, FIFO full)
• Integrated 512 byte FIFO buffer
• Hardware synchronization of pressure sensor data

Applications:

• Vertical velocity indication (e.g. rise/sink speed)
• Internet of things
• Enhancement of GPS navigation
• Indoor navigation & localization
• Outdoor navigation, leisure and sports applications
• Weather forecast
• Health care applications
• Fitness applications
• AR & VR applications
• Context awareness

Package:

• 2.0 mm x 2.0 mm x 0.75 mm metal lid LGA (10-pin)

Table 1: Key Features of BMP388

The sensor is more accurate than its predecessor BMP280, covering a wide measurement range from 300 hPa to 1250 hPa.

This new barometric pressure sensor exhibits an attractive price-performance ratio coupled with low power consumption.

It is available in a compact 10-in 2.0 x 2.0 x 0.75 mm³ LGA package with metal lid

Due to the built-in hardware synchronization of the pressure sensor data and its ability to synchronize data from external devices such as acceleration sensors, the BMP388 is ideally suited for fitness and navigation applications which require highly accurate, low power and low latency sensor data fusion.

The new interrupt functionality provides simple access to data and storage. Examples of interrupts than can be used in a power efficient manner without using software algorithms include: Data ready interrupt, watermark interrupt (on byte level) or FIFO full interrupt.

BMP388 also includes a new FIFO functionality. This greatly improves ease of use while helping to reduce power consumption of the overall device system during full operation. The integrated 512 byte FIFO buffer supports low power applications and prevents data loss in non-real-time systems.

• Vertical velocity indication (e.g. rise/sink speed)
• Internet of things
• Enhancement of GPS navigation (e.g. time-to-first-fix improvement, dead-reckoning, slope detection)
• Indoor navigation & localization (floor detection, elevator detection)
• Outdoor navigation, leisure and sports applications
• Weather forecast
• Health care applications (e.g. spirometry)
• Fitness applications like enhancement of calorie detection
• AR & VR applications
• Context awareness

The interrupt pin / pad is configured by the Bits in the 'INT_CTRL' register (see 4.3.14). However, the status bits are not influenced thereby.

The output mode of the INT pad is controlled by int_od bit:

Table 18: int_od

The level of the interrupt pad can be configured and switched by int_level between active low and active high:

Table 19: int_level

The latching of interrupts for INT pad and INT_STATUS register can be enabled by int_latch='1' or disabled by int_latch='0' .

FIFO interrupts are mapped to the INT pad by enabling the respective functions. For mapping FIFO watermark reached interrupt to the pad, the fwtm_en bit shall be written to '1' (disabling by '0'). The FIFO full interrupt can be mapped by writing ffull_en with '1').

The absolute maximum ratings are provided in Table 3 .

Table 3: Absolute maximum ratings

• Vertical velocity indication (e.g. rise/sink speed)
• Internet of things
• Enhancement of GPS navigation (e.g. time-to-first-fix improvement, dead-reckoning, slope detection)
• Indoor navigation & localization (floor detection, elevator detection)
• Outdoor navigation, leisure and sports applications
• Weather forecast
• Health care applications (e.g. spirometry)
• Fitness applications like enhancement of calorie detection
• AR & VR applications
• Context awareness