Datasheet STMicroelectronics UVIS25TR

UVIS25
Digital UV Index sensor: 0 - 15 UV Index output range
Datasheet - preliminary data 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. LGA-10L (2.5 x 2.5 x 0.76 mm) 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. 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 IІC interfaces Supply voltage: 1.7 to 3.6 V ECOPACK® lead-free compliant Applications UV Index measurements Wearable devices Smartphone and tablet Weather stations Table 1. Device summary
Order code UVIS25TR Temperature range [°C] -20 to +85 Package LGA-10L Packing Tape and reel February 2015 DocID027323 Rev 1 1/26
www.st.com This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice. Contents UVIS25 Contents
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 3.2 I2C interface 8 Factory calibration . 8 4 Application hints 9
4.1 Soldering information . 9 5 Digital interfaces . 10
5.1 5.2 IІC serial interface 10
5.1.1 5.2.1 5.2.2 5.2.3 IІC operation . 11 SPI read . 13 SPI write 14 SPI read in 3-wires mode . 15 SPI bus interface . 12 6 7 Register mapping 16 Register description 17
7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 WHO_AM_I (0Fh) . 17 CTRL_REG1 (20h) 17 CTRL_REG2 (21h) 18 CTRL_REG3 (22h) 19 INT_CFG (23h) . 20 INT_SOURCE (24h) . 21 THS_UV (25h) . 21 STATUS_REG (27h) 21 UV_OUT_REG (28h) 22 2/26 DocID027323 Rev 1 UVIS25 Contents 8 9 Package mechanical data 23 Revision history . 25 DocID027323 Rev 1 …