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PDF ISL29120 Data sheet ( Hoja de datos )
| Número de pieza | ISL29120 | |
| Descripción | Light Sensor | |
| Fabricantes | Intersil | |
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Digital Output, Low Power, Red, Green, and Blue Color
Light Sensor
ISL29120
The ISL29120 is a low power, high sensitivity, integrated red,
green, and blue light sensor with an I2C (SMBus Compatible)
interface. Its state-of-the-art photodiode array provides an
accurate red, green and blue spectral response. The ADC is
capable of rejecting 50Hz and 60Hz flicker caused by artificial
light sources. A selectable range allows the user to optimize
sensitivity suitable for the specific application.
ISL29120 is optimized for sensing red, green and blue light
components in an non-infrared environment (fluorescent and
LED lighting). When operating in infrared rich environments, an
external IR blocking filter should be used for accurate
measurements.
In normal continuous operation, the ISL29120 power
consumption is 70µA, which reduces to 0.3µA in power down
mode. In polling mode, the auto-power-down function shuts down
most of the device after each ADC conversion.
The ISL29120 supports both hardware and software interrupts.
The interrupt thresholds are user programmable. The Interrupt
persistency feature reduces false trigger notification.
Designed to operate on supplies from 2.25V to 3.3V and I2C supply
from 1.7V to 3.6V, the ISL29120 is specified for operation over the
-40°C to +85°C ambient temperature range.
Features
• 70µA Operating Current, 0.3µA Shutdown Current
• I2C (SMBus Compatible) Output
• Programmable 4, 8, 12 or 16-bits ADC Resolution
• Programmable Interrupt Windows
• Two Optical Sensitivity Ranges
• 2.25 to 3.63V Operating Power Supply
• 1.7V to 3.6V Supply for I2C Interface
• 2.0mmx2.1mmx0.7mm 6 Ld ODFN Package
Applications
• Smart Phone, PDA, GPS, Tablet PCs, LCD-TVs, Digital Picture
Frames, Digital Cameras
• Dynamic Display Color Balancing
• Printer Color Enhancement
• Industrial/Commercial LED Lighting Color Management
• Ambient Light Color Detection/Correction
• OLED Display Aging Compensation
VDD_PULLUP
SMBMaster
INT
SDA
SCL
VDD
R2
100Ω
4
6
5
INT
SDA
SCL
VDD
REXT
GND
1
3
2
PULL-UP RESISTORS
2.7kΩ TO 10kΩ
ISL29120
R1
499kΩ
C1
1µF
FIGURE 1. TYPICAL APPLICATION
0.5
RED SENSOR
0.4 BLUE SENSOR
0.3
0.2
0.1
0 GREEN SENSOR
300 400 500 600 700 800 900 1000 1100
WAVELENGTH (nm)
FIGURE 2. RELATIVE SPECTRAL SENSITIVITY FOR RED, GREEN AND
BLUE SENSE MODES
May 29, 2012
FN8314.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Free Datasheet http://www.datasheet4u.com/
1 page  
ISL29120
Register Set
There are eight registers that are available in the ISL29120. Table 1 summarizes their functions.
ADDR
00h
01h
02h
03h
04h
05h
06h
07h
REG NAME
COMMANDI
COMMANDII
DATALSB
DATAMSB
INT_LT_LSB
INT_LT_MSB
INT_HT_LSB
INT_HT_MSB
7
OP2
0
D7
D15
TL7
TL15
TH7
TH15
6
OP1
0
D6
D14
TL6
TL14
TH6
TH14
TABLE 1. REGISTER SET
BIT
54
3
OP0 0
0
0 0 RES1
D5 D4
D3
D13 D12
D11
TL5 TL4
TL3
TL13
TL12
TL11
TH5 TH4
TH3
TH13
TH12
TH11
2
IFLG
RES0
D2
D10
TL2
TL10
TH2
TH10
1
PRST1
0
D1
D9
TL1
TL9
TH1
TH9
0
PRST0
RANGE
D0
D8
TL0
TL8
TH0
TH8
DEFAULT
00h
00h
00h
00h
00h
00h
FFh
FFh
Command Register I 0x00
The first command register has the following functions:
Operation Mode: Bits[7:5]. These three bits determine the
operation mode of the device.
TABLE 2. OPERATION MODE
0x00[7:5]
OPERATION
000 Power-down
001 Red Sensor once
010 Blue Sensor once
011 Green Sensor once
100 Reserved
101 Red Sensor continuous
110 Blue Sensor continuous
111 Green Sensor continuous
Interrupt flag: Bit[2]. This is the interrupt status bit. The bit is set
high when the interrupt thresholds have been triggered. Once
triggered, the INT pin stays low and the status bit stays high. Both
the interrupt pin and the status bit are cleared at the end of
Command Register I read.
TABLE 3. INTERRUPT FLAG
0x00[2]
OPERATION
0 No Interrupt event
1 Interrupt event triggered
Interrupt persist: Bits[1:0]. The interrupt pin and the interrupt flag
are triggered/set when the data sensor reading is out of the
interrupt threshold window after m consecutive data conversion
cycles. The interrupt persist bits determine m.
0x00[1:0]
00
01
10
11
TABLE 4. INTERRUPT PERSISTENCE
NUMBER OF DATA CONVERSION CYCLES
1
4
8
16
Command Register II 0x01
The second command register has the following functions:
Resolution: Bits[3:2] determine the ADC’s resolution and the
integration time. The integration time is the period the device’s
analog-to-digital (A/D) converter samples the photodiode current
for a measurement.
TABLE 5. ADC RESOLUTION DATA WIDTH
0x01[3:2]
00
01
10
11
INTEGRATION TIME
(ms)
90
5.6
0.35
0.022
RESOLUTION
16 Bits
12 Bits
8 Bits
4 Bits
1. Range 0x01[0]: The Full Scale Optical Range (FSOR). Optical
sensitivity for the ‘Low’ range is 4.75 times the optical
sensitivity in ‘High’ range.
TABLE 6. RANGE
0x01[0]
FSR
0 Low
1 High
5 FN8314.0
May 29, 2012
Free
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| PDF Descargar | [ Datasheet ISL29120.PDF ] | |
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