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UVIS25 Datasheet

Digital UV Index sensor

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UVIS25
Digital UV Index sensor: 0 - 15 UV Index output range
Datasheet - preliminary data
LGA-10L
(2.5 x 2.5 x 0.76 mm)
Features
0 - 15 UV Index output range
Resolution: UVI/16
Active and power down modes
Continuous reading at 1 Hz ODR / one shot
mode
Interrupt functions: Data Ready and UVI
thresholds
SPI and I²C interfaces
Supply voltage: 1.7 to 3.6 V
ECOPACK® lead-free compliant
Description
The UVIS25 is a digital UV Index sensor able to
provide an accurate measurement of the
Ultraviolet radiation index (UVI) from the sunlight.
It includes a sensing element and a mixed signal
ASIC to provide the UV Index data trough I2C and
SPI interfaces.
A dedicated technology has been developed to
achieve the best accuracy for UV Index
measurements.
The UVIS25 allows the measurement of the UV
Index, without the need of a dedicated algorithm
to calculate the UV Index and without specific
calibrations at customer manufacturing line.
The device can be configured to generate
interrupt events based on a threshold crossing or
when a new set of data is generated. The event is
available in a register as well as in a dedicated
pin.
The UVIS25 is available in a full-mold LGA
package (LGA). It is guaranteed to operate over a
temperature range extending from -20°C to
+85°C. The package is transparent to allow
external solar radiation to reach the sensing
element.
Applications
UV Index measurements
Wearable devices
Smartphone and tablet
Weather stations
Order code
UVIS25TR
Table 1. Device summary
Temperature range
[°C]
Package
-20 to +85
LGA-10L
Packing
Tape and reel
February 2015
DocID027323 Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
1/26
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STMicroelectronics Electronic Components Datasheet

UVIS25 Datasheet

Digital UV Index sensor

No Preview Available !

Contents
Contents
UVIS25
1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Sensor parameters and electrical specifications . . . . . . . . . . . . . . . . . . 6
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 I2C interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Factory calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 Soldering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 Digital interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1 I²C serial interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1.1 I²C operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2 SPI bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.2.1 SPI read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2.2 SPI write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2.3 SPI read in 3-wires mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6 Register mapping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7 Register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.1 WHO_AM_I (0Fh) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.2 CTRL_REG1 (20h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.3 CTRL_REG2 (21h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.4 CTRL_REG3 (22h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.5 INT_CFG (23h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.6 INT_SOURCE (24h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.7 THS_UV (25h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.8 STATUS_REG (27h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.9 UV_OUT_REG (28h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2/26 DocID027323 Rev 1


Part Number UVIS25
Description Digital UV Index sensor
Maker STMicroelectronics
Total Page 26 Pages
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