Document
ILPS28QSW
Datasheet
Dual full-scale, 1260 hPa and 4060 hPa, absolute digital output barometer with Qvar detection in a water-resistant package
Features
• Dual full-scale absolute pressure sensor in a water-resistant package
– Mode 1: 260 ~ 1260 hPa
– Mode 2: 260 ~ 4060 hPa
• Embedded analog hub for processing analog input data
• Embedded Qvar for detecting electric charge variation
• Current consumption down to 1.7 μA
• Absolute pressure accuracy: 0.5 hPa
• Low pressure sensor noise: 0.32 Pa
• Embedded temperature compensation
• Extended temperature range from -40 to +105 °C
• 24-bit pressure data output
• ODR from 1 Hz to 200 Hz
•
I²C or MIPI I3CSM interface
• Embedded FIFO
• Supply voltage: 1.7 to 3.6 V
• Easily sealed package with O-ring
• ECOPACK lead-free compliant
Product status link ILPS28QSW
Product summary
Order code
ILPS28QSWTR
Temperature range
-40 to +105 °C
Package
CCLGA-7L 2.8 x 2.8 x 1.95 mm
Packing
Tape and reel
Product resources TN0018 (design and soldering)
Product labels
Applications
• Industrial applications • Gas and water metering • Weather station equipment • Altimeters and barometers for outdoor devices • Smart filters • Ventilators and CPAP equipment • Man-down detection
Description
The ILPS28QSW is an ultracompact, piezoresistive, absolute pressure sensor that functions as a digital output barometer, supporting dual full-scale up to userselectable 4060 hPa. The device comprises a sensing element and an IC interface that communicates over the I²C or MIPI I3CSM interface from the sensing element to the application. The ILPS28QSW provides lower power consumption, achieving lower pressure noise than its predecessor. The ILPS28QSW embeds an analog hub sensing functionality that is able to connect an analog input and convert it to a digital signal for embedded processing. In addition, an embedded Qvar (electric charge variation detection) channel can be enabled for sensing in applications such as water-leak detection, tap, double tap, long press, and L/R - R/L swipe.
DS13905 - Rev 1 - January 2023 For further information contact your local STMicroelectronics sales office.
www.st.com
ILPS28QSW
The ILPS28QSW is available in a ceramic LGA package with metal lid. It is guaranteed to operate over a temperature range extending from -40 °C to +105 °C. The package is holed to allow external pressure to reach the sensing element. Gel inside the IC protects the electrical components from water and the metal cap is, optionally, connected to ground or left floating electrically in the application PCB layout. The connection of the metal cap is determined according to the customer’s target application.
DS13905 - Rev 1
page 2/52
1
Block diagrams
Figure 1. Device architecture block diagram
Temperature Sensor
ILPS28QSW
Block diagrams
MUX
Analog Front-End
ADC
Digital Logic
I2C / MIPI I3CSM
Sensing Element
Qvar / Analog input
Sensor Bias
Voltage and Current Bias
Clock and timing
Analog Front-End
ADC
AVG Filter
Figure 2. Digital logic
Pressure Compensation
Temperature Compensation
EN_LPFP
LP Filter
1
POUT
0
FIFO
Output Registers
TOUT
Output
Registers
I2C / MIPI I3CSM
DS13905 - Rev 1
page 3/52
ILPS28QSW
Pin description
2
Pin description
Figure 3. Pin connections (bottom view)
SDA 1
1
VDD 6
2 AH1/QVAR1
7
GND 5
3 SCL
4 AH2/QVAR2
Pin number 1 2 3 4 5 6 7
Name SDA AH1/QVAR1 SCL AH2/QVAR2 GND VDD PAD2LID
Table 1. Pin description
Function I²C / MIPI I3CSM serial data (SDA) Connect to GND if analog input / Qvar sensing is not needed. I²C / MIPI I3CSM serial clock (SCL) Connect to GND if analog input / Qvar sensing is not needed. 0 V supply Power supply Pad connection to metal lid
DS13905 - Rev 1
page 4/52
3
3.1
Mechanical and electrical specifications
ILPS28QSW
Mechanical and electrical specifications
Mechanical characteristics
VDD = 1.8 V, T = 25 °C, unless otherwise noted.
Table 2. Pressure and temperature sensor characteristics
Symbol
Parameter
Pressure sensor characteristics
PTop Pop
Operating temperature range Operating pressure range Mode 1 Mode 2
Pbits
Pressure output data
Psens
Pressure sensitivity Mode 1 Mode 2
PAccRel
Relative pressure accuracy(2) Mode 1 Mode 2
Test condition
Min. Typ.(1) Max.
Unit
-40
+105
°C
260
1260
hPa
260
4060
24
bits
T =25 °C P= 800 ~ 1100 hPa P = 2060 ~ 4060 hPa
4096 2048
±0.015 ±1
LSB/hPa hPa
PAccT Pnoise
Absolute pressure accuracy Mode 1
Mode 2
Refer to Table 3 RMS pressure sensing noise(3) Mode1 Mode 2 Refer to Table 25
ODRPres Pressure output data rate
P_longterm Pressure accuracy, long-term stability(4)
P_drift Soldering drift
Temperature sensor characteristics
Top
Operating temperature range
Tsens
Temperature sensitivity
P = 660 ~ 1260 T = 0 ~ 65 °C T = -40 ~ 105 °C
P = 1260 ~ 4060 hPa T = 0 ~ 65 °C T = -20 ~ 105 °C T = 25 °C
±1 ±2.5
±0.43% ±0.6%
0.32 0.57
1 4 10 25 50 75 100 200.