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PDF ISL29012 Data sheet ( Hoja de datos )
| Número de pieza | ISL29012 | |
| Descripción | Light-to-Digital Output Sensor | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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®
Data Sheet
September 30, 2008
ISL29012
FN6476.0
Light-to-Digital Output Sensor with High
Sensitivity, Gain Selection, Interrupt
www.dFatuasnhceetti4ou.ncomand I2C Interface
The ISL29012 is an integrated light sensor with I2C (SMBus
Compatible) interface. It has an internal signed15-bit
integrating type ADC designed based on the
charge-balancing A/D conversion technique. This ADC is
capable of rejecting 50Hz and 60Hz flicker caused by
artificial light sources. The lux range select feature allows
the user to program the lux range for optimized counts/lux.
In normal operation, power consumption is typically 250µA.
Furthermore, a power-down mode can be controlled by
software via the I2C interface, reducing power consumption
to less than 1µA.
The ISL29012 supports a hardware interrupt that remains
asserted low until the host clears it through I2C interface.
Designed to operate on supplies from 2.5V to 3.3V, the
ISL29012 is specified for operation over the -40°C to +85°C
ambient temperature range.
Ordering Information
PART NUMBER
(Note)
TEMP.
PACKAGE
RANGE (°C) (Pb-Free)
PKG.
DWG. #
ISL29012IROZ-T7*
-40 to +85 6 Ld ODFN L6.2x2.1
ISL29012IROZ-EVALZ Evaluation Board
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach
materials and NiPdAu plate - e4 termination finish, which is RoHS
compliant and compatible with both SnPb and Pb-free soldering
operations. Intersil Pb-free products are MSL classified at Pb-free
peak reflow temperatures that meet or exceed the Pb-free
requirements of IPC/JEDEC J STD-020.
Block Diagram
VDD
1
LIGHT DATA
PROCESS
PHOTODIODE
ARRAY
IREF
FOSC
3
REXT
INTEGRATING
ADC
EXT
TIMING
216
COUNTER
2
GND
ISL29012
COMMAND
REGISTER
DATA
REGISTER
I2C
5 SCL
6 SDA
INT
INTERRUPT 4 INT
Features
• Range Select Via I2C
- Range 1 = 0.5 lux to 2,000 lux
- Range 2 = 0.5 lux to 8,000 lux
- Range 3 = 0.5 lux to 32,000 lux
- Range 4 = 0.5 lux to 128,000 lux
• Human Eye Response (540nm peak sensitivity)
• Temperature Compensated
• Signed 15-bit Resolution
• Adjustable Resolution: Up to 20 Counts per lux
• User-programmable Upper and Lower Threshold Interrupt
• Simple Output Code, Directly Proportional to lux
• IR + UV Rejection
• 50Hz/60Hz Rejection
• 2.5V to 3.3V Supply
• 6 Ld ODFN (2.1mmx2mm)
• Pb-free (RoHS compliant)
• Operating Temperature Range: -40°C to +85°C
• I2C and SMBus Compatible
Applications
• Display and Keypad Backlight Dimming
- Mobile Devices: Smart phone, PDA, and GPS
- Computing Devices: Notebook PC, UMPC Web Pod
- Consumer Devices: LCD-TV, Digital Picture Frame and
Digital Cameras
• Industrial and Medical Light Sensing
Pinout
ISL29012
(6 LD ODFN)
TOP VIEW
VDD 1
GND 2
REXT 3
6 SDA
5 SCL
4 INT
*EXPOSED PAD CAN BE CONNECTED TO GND OR
ELECTRICALLY ISOLATED
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2008. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL29012
Register Set
There are eight registers that are available in the ISL29012. Table 1 summarizes the available registers and their functions.
ADDR REG NAME
7
www.dat0a0shheet4uC.cOoMmMAND
01h CONTROL
ADCE
0
02h Interrupt ITH_HI7
Threshold_HI
03h Interrupt ITH_LO7
Threshold_LO
04h LSB SENSOR S7
05h MSB
SENSOR
S15
06h LSB TIMER
T7
07h MSB TIMER T15
6
ADCPD
0
ITH_HI6
TABLE 1. REGISTER SET
BIT
54
3
TIMM
0 ADCM1
INT_FLAG
0
GAIN1
ITH_HI5 ITH_HI4 ITH_HI3
ITH_LO6 ITH_LO5 ITH_LO4 ITH_LO3
S6 S5 S4
S14 S13 S12
S3
S11
T6 T5
T14 T13
T4
T12
T3
T11
2
ADCM0
GAIN0
ITH_HI2
ITH_LO2
S2
S10
T2
T10
1
RES1
IC1
ITH_HI1
ITH_LO1
S1
S9
T1
T9
0
RES0
IC0
ITH_HI0
ITH_LO0
S0
S8
T0
T8
DEFAULT
00h
00h
FFh
00h
00h
00h
00h
00h
TABLE 2. WRITE ONLY REGISTERS
REGISTER
FUNCTIONS/
ADDRESS NAME
DESCRIPTION
b1xxx_xxxx sync_I2C Writing a logic 1 to this address bit ends the
current ADC-integration and starts another.
Used only with External Timing Mode.
bx1xx_xxxx clar_int Writing a logic 1 to this address bit clears
the interrupt.
Command Register 00(hex)
The Read/Write command register has five functions:
1. Enable; Bit 7.This function either resets the ADC or enables
the ADC in normal operation. A logic 0 disables ADC to
reset-mode. A logic 1 enables ADC to normal operation.
TABLE 3. ENABLE
BIT 7
OPERATION
0 disable ADC-core to reset-mode (default)
1 enable ADC-core to normal operation
2. ADCPD; Bit 6. This function puts the device in a power
down mode. A logic 0 puts the device in normal
operation. A logic 1 powers down the device.
TABLE 4. ADCPD
BIT 6
OPERATION
0 Normal operation (default)
1 Power Down
3. Timing Mode; Bit 5. This function determines whether the
integration time is done internally or externally. In Internal
Timing Mode, integration time is determined by an
internal dual speed oscillator (fOSC), and the n-bit (n = 4,
8, 12,16) counter inside the ADC. In External Timing
Mode, integration time is determined by the time between
three consecutive external-sync sync_I2C pulses
commands.
BIT 5
0
1
TABLE 5. TIMING MODE
OPERATION
Internal Timing Mode. Integration time is internally timed
determined by fOSC, REXT, and number of clock cycles.
External Timing Mode. Integration time is externally
timed by the I2C host.
4. Photodiode Select Mode; Bits 3 and 2. Setting Bit 3 and
Bit 2 to 1 and 0 enables ADC to give light count DATA
output.
TABLE 6. PHOTODIODE SELECT MODE; BITS 2 AND 3
BITS 3:2
MODE
0:0 Disable ADC
0:1 Disable ADC
1:0 Light count DATA output in signed (n-1) bit *
1:1 No operation.
* n = 4, 8, 12,16 depending on the number of clock cycles
function.
5. Width; Bits 1 and 0. This function determines the number
of clock cycles per conversion. Changing the number of
clock cycles does more than just change the resolution of
the device. It also changes the integration time, which is
the period the device’s analog-to-digital (A/D) converter
samples the photodiode current signal for a lux
measurement.
.
TABLE 7. WIDTH
BITS 1:0
0:0
0:1
1:0
1:1
NUMBER OF CLOCK CYCLES
216 = 65,536
212 = 4,096
28 = 256
24 = 16
5 FN6476.0
September 30, 2008
5 Page 
2.5V TO 3.3V
www.datasheet4u.com
C1
0.01µF
I2C SLAVE_0
1 VDD
SDA 6
2 GND
SCL 5
3 REXT
INT 4
REXT
100k ISL29012
ISL29012
R1 R2
10k 10k
R3
RES1
I2C SLAVE_1
SDA
SCL
2.5V TO 5.5V
I2C SLAVE_n
SDA
SCL
FIGURE 6. ISL29012 TYPICAL CIRCUIT
I2C MASTER
MICROCONTROLLER
SDA
SCL
INT
11 FN6476.0
September 30, 2008
11 Page | ||
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| PDF Descargar | [ Datasheet ISL29012.PDF ] | |
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