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PDF ( 数据手册 , 数据表 ) UVIS25TR

零件编号 UVIS25TR
描述 Digital UV Index sensor
制造商 STMicroelectronics
LOGO STMicroelectronics LOGO 


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UVIS25TR 数据手册, 描述, 功能
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
www.st.com







UVIS25TR pdf, 数据表
Functionality
3 Functionality
UVIS25
The UVIS25 is a high resolution, digital output UVI sensor packaged in an LGA full-mold
package. The device has been optimized for the UVI measurement to provide high level of
accuracy: 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.
3.1 I2C interface
The UV Index data may be accessed through an I²C or SPI interface, making the device
particularly suitable for direct interfacing with a microcontroller.
The UVIS25 features a Data-Ready signal which indicates when a new UV Index is
measured simplifying data synchronization or an interrupt generator that can identify if the
UV Index crosses a threshold.
The two events are available on a register (7.8: STATUS_REG (27h)) or a dedicated pin
(INT_DRDY) can be configured.
3.2 Factory calibration
The IC interface is factory calibrated to measure the sun radiation. The calibration data are
stored inside the device in a non-volatile memory. Any time the device is turned on, the
calibration data are downloaded into the registers to be used during the active operation.
This allows to use the device without further calibration.
8/26 DocID027323 Rev 1







UVIS25TR equivalent, schematic
Register mapping
6 Register mapping
UVIS25
Table 13 provides a quick overview of the 8-bit registers embedded in the device.
Name
Reserved
WHO_AM_I
Reserved
CTRL_REG1
CTRL_REG2
CTRL_REG3
INT_CFG
INT_SOURCE
THS_UV
Reserved
STATUS_REG
UV_OUT_REG
Table 13. Registers address map
Type
Register
address
Hex
Default
- 00-0E
-
R 0F 11001010
- 10-1F
-
R/W 20 00000000
R/W 21 00000000
R/W 22 00000000
R/W 23 00000000
R 24 00000000
R/W 25 00000000
- 26
-
R 27 00000000
R 28 output
Function and
comment
Reserved
ID register
Reserved
Reserved
Registers marked as Reserved must not be changed. The writing to those registers may
cause permanent damages to the device.
To guarantee the proper behavior of the device, all register addresses not listed in the
previous table must not be accessed, and the content stored in those registers must not be
changed.
The content of the registers that are loaded at boot should not be changed. They contain the
factory calibration values. Their content is automatically restored when the device is
powered up.
16/26
DocID027323 Rev 1










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