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PDF ALS-PDIC17-57B-TR8 Data sheet ( Hoja de datos )
| Número de pieza | ALS-PDIC17-57B-TR8 | |
| Descripción | Digital Ambient Light Sensor | |
| Fabricantes | Everlight Electronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ALS-PDIC17-57B-TR8 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
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Surface - Mount
I2C Digital Ambient Light Sensor
ALS-PDIC17-57B/TR8
Features
‧Close to the human eye's response
‧15 bit effective resolution
‧50Hz/60Hz rejection
‧Low sensitivity variation across various light sources
‧Operating temperature performance, -40oC to 85oC
‧Wide supply voltage range, 2.7V to 5.5V
• Low power consumption, less than 2mW while operating
• Shut-down mode, current consumption less than 0.1uA
2
• I C serial port communication: (1) Standard 100kHz, (2) Fast 400kHz
‧High dynamic sensing range and from 0 to 88,000 Lux
‧Dimension: 2.0mm(L)x2.0mm(W)x0.6mm(H)
‧RoHS compliant and Pb Free
Description
The ALS-PDIC17-57B/TR8 is a digital-output light sensor with a two-wire, I2C serial
interface that is compatible with SMBus operating at 100 KHz serial clock frequency. It
combines a photodiode and an analog-to-digital converter (ADC) on a single CMOS integrated
circuit to provide light measurements over an effective 15-bit dynamic range. One operation
modes are provided with constantly refreshing ADC. When working in “one time integration”
mode, no external resister is required. The integrating conversion technique used by
ALS-PDIC17-57B/TR8 effectively eliminates the effect of flicker from AC-powered lamps,
increasing the stability of the measurement. ALS-PDIC17-57B/TR8 is very close to human-eye
vision, having very low response to non-visible light, such as infrared and ultra-violet light.
Applications
• Detection of ambient light to control display backlighting
Mobile devices – Mobile phones, PDAs, Table PC and GPS
Computing device – TFT LCD monitor
Consumer device – TFT LCD TV, Plasma TV, Video camera, Digital camera, Toys
• Detection of ambient light for controlling the backlighting of TFT LCD display
• Automatic residential and commercial lighting management
• Automatic contrast enhancement for electronic signboard
• Ambient light monitoring device for daylight and artificial light
Everlight Electronics Co., Ltd.
Document No: DLS-00000xx Rev0.1
1
http://www.everlight.com
Jun. 22, 2011
1 page  
Surface - Mount
I2C Digital Ambient Light Sensor
ALS-PDIC17-57B/TR8
Notes:
1.
2.
3.
Cb = capacitance of one bus line in pF
The maximum tof for the I2C data and clock bus lines quoted in the AC table is longer
than the specified maximum tof for the output stages (250nS). This allows series
protection resistors (RS) to be connected between I2C data / clock pins and the I2C
data / clock bus lines without exceeding the maximum specified tof.
≦The I2C bus operation voltage is 1.8V, The ALS-PDIC17-57B supply voltage must 3V
(3Vx0.6=1.8V)
AC Characteristics of I2C Signals in Standard and Fast Mode
Parameter
Symbol
I2C clock frequency
Hold time (repeated) START condition.
After this period, the first clock pulse is
generated.
Low period of I2C clock
High period of I2C clock
Set-up time for a repeated START
condition
Data hold time for I2C-bus devices
Data set-up time
Rise time of both I2C data and clock
signal’s
Fall time of both I2C data and clock
signal’s
Set-up time for STOP condition
Bus free time between STOP and
START condition
Capacitive load for each bus line
fSCL
tHD;STA
tLOW
tHIGH
tSU;STA
tHD;DAT
tSU;DAT
tr
tf
tSU;STO
tBUF
Cb
Standard Mode
Min. Max.
0 100
4.0
4.7
4.0
4.7
0
250
-
3.45
-
1000
- 300
4.0 -
4.7 -
- 400
Fast Mode
Min. max.
0 400
0.6 -
1.3
0.6
0.6
0 0.9
100 -
5 300
0.1 300
0.6 -
1.3 -
- 400
Unit
KHz
us
us
us
us
us
ns
ns
ns
us
us
pF
Figure 2 I2C Timing Diagram
Everlight Electronics Co., Ltd.
Document No: DLS-00000xx Rev0.1
5
http://www.everlight.com
Jun. 22, 2011
5 Page 
Surface - Mount
I2C Digital Ambient Light Sensor
ALS-PDIC17-57B/TR8
Theory of Operation
The photocurrent, generated by the built-in photodiode while being illuminated, is
proportionally converted to frequency; the digital frequency signal is then integrated by a
15-bit counter for a predetermined period of time (tint). This period of time is called integration
time. The converted data are read out through a two-wire, I2C Interface bus. Since the
photodiode has been specially processed to suppress the spectral response in infrared region,
the readout is very close to the photonic transfer function, V(λ), which is the mathematic
expression of human-eye's response to ambient light.
Address Option for I2C
The I2C address is determined before placing an order; the default address is 0x29.
ADC Register
The ADC register contains 16 bits with a 15-bit wide data from D0 to D14 and a valid bit
D15. The register is divided into two groups; D[15..8] is the most significant (MS) byte and
D[7..0] is the least significant (LS) byte. See Table 1 for details.
Table 1 ADC Register Structure
Valid Bit Data Bits
D15
D14 D13 ~ D8
MSB
Most Significant (MS) byte
D7~D1
D0
LSB
Least Significant (LS) byte
Everlight Electronics Co., Ltd.
Document No: DLS-00000xx Rev0.1
11
http://www.everlight.com
Jun. 22, 2011
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ALS-PDIC17-57B-TR8.PDF ] | |
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