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PDF ISL76683 Data sheet ( Hoja de datos )
| Número de pieza | ISL76683 | |
| Descripción | Light-to-Digital Output Sensor | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Light-to-Digital Output Sensor with Gain Selection,
Interrupt Function and I2C Interface
ISL76683
The ISL76683 is an integrated light sensor with an internal
integrating ADC intended for automotive applications. The ADC
provides 16-bit resolution and is capable of rejecting 50Hz and
60Hz flicker caused by artificial light sources. The I2C interface
provides four user programmable lux sensitivity ranges for
optimized counts/lux in a variety of lighting conditions. In
addition, the I2C interface provides multi-function control of the
sensor and remote monitoring capabilities.
In normal operation, power consumption is less than 300µA.
Furthermore, a software power-down mode controlled via the I2C
interface reduces power consumption to less than 1µA.
The ISL76683 supports twin (upper & lower) user programmed
thresholds and provides a hardware interrupt that remains
asserted low until the host clears it via the I2C control interface.
Designed to operate on supplies from 2.5V to 3.3V, the ISL76683 is
qualified to AECQ100 and specified for operation over the -40°C to
+105°C (grade 2) ambient temperature range. To achieve this, the
ISL76683 is packaged in a special extended temperature clear
package.
Features
• Range select via I2C
- Range 1 = 0 lux to 1000 lux
- Range 2 = 0 lux to 4000 lux
- Range 3 = 0 lux to 16,000 lux
- Range 4 = 0 lux to 64,000 lux
• Human Eye Response (540nm Peak Sensitivity)
• Temperature Compensated
• 16-bit Resolution
• Adjustable Sensitivity: up to 65 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)
Applications
• Automotive Ambient Light Sensing
• Backlight Control
• Lighting Controls
PHOTODIODE 1
VDD
1
www.DataSheet4U.com
MUX
INTEGRATING
ADC
COMMAND
REGISTER
DATA
REGISTER
PHOTODIODE 2
IREF
EXT
TIMING
I2C
3
REXT
FOSC
216
COUNTER
2
GND
ISL76683
INT
INTERRUPT
FIGURE 1. BLOCK DIAGRAM
5 SCL
6 SDA
4 INT
January 31, 2011
FN7697.1
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. 2011. 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.
1 page  
ISL76683
Typical Performance Curves (REXT = 100kΩ) (Continued)
1.015
1.010
1.005
1.000
0.995
TA = +27°C
COMMAND = 00H
5000 lux
200 lux
320.0
319.5
319.0
318.5
TA = +27°C
0.990
2.0 2.3 2.6 2.9 3.2 3.5
SUPPLY VOLTAGE (V)
FIGURE 6. OUTPUT CODE vs SUPPLY VOLTAGE
3.8
318.0
2.0 2.3 2.6 2.9 3.2 3.5 3.8
SUPPLY VOLTAGE (V)
FIGURE 7. OSCILLATOR FREQUENCY vs SUPPLY VOLTAGE
330
VDD = 3V
320
310
300
290
280
270
260
-60 -40 -20
0 20 40 60
TEMPERATURE (°C)
80 100 120
FIGURE 8. SUPPLY CURRENT vs TEMPERATURE
10
VDD - 3V
8
COMMAND = 00H
0 LUX
6
4
2 RANGE2
0
-60 -40 -20
0 20 40 60
TEMPERATURE (°C)
80 100 120
FIGURE 9. OUTPUT CODE FOR 0 LUX vs TEMPERATURE
1.10
1.08
1.06
VDD = 3V
COMMAND = 00H
1.04
1.02
1.00
0.98
5000 LUX
RANGE 3
0.96
200 LUX
RANGE 1
www.DataSh0e.9e4t4U.com
0.92
-60 -40 -20
0 20 40 60
TEMPERATURE (°C)
80 100 120
FIGURE 10. OUTPUT CODE vs TEMPERATURE
330
VDD = 3V
329
328
327
326
325
-60 -40 -20
0 20 40 60
TEMPERATURE (°C)
80 100 120
FIGURE 11. OSCILLATOR FREQUENCY vs TEMPERATURE
5 FN7697.1
January 31, 2011
5 Page 
ISL76683
Gain/Range, Range (k)
The Gain/Range can be programmed in the control register to
give Range (k) determining the FSR. Note that Range(k) is not
the FSR (see Equation 3). Range(k) provides four constants
depending on programmed k that will be scaled by REXT (see
Table 9). Unlike REXT, Range(k) dynamically adjusts the FSR. This
function is especially useful when light conditions are varying
drastically while maintaining excellent resolution.
Number of Clock Cycles, n-bit ADC
The number of clock cycles determines “n” in the n-bit ADC; 2n clock
cycles is a n-bit ADC. n is programmable in the command register in
the width function. Depending on the application, a good balance of
speed and resolution has to be considered when deciding for n. For
fast and quick measurement, choose the smallest n = 4. For
maximum resolution without regard of time, choose n = 16.
Table 12 compares the trade-off between integration time and
resolution. See Equations 10 and 11 for the relation between
integration time and n. See Equation 3 for the relation of n and
resolution.
TABLE 12. RESOLUTION AND INTEGRATION TIME SELECTION
RANGE1
fOSC = 327kHz
n tINT (ms)
RESOLUTION
LUX/COUNT
16 200
0.01
RANGE4
fOSC = 655kHz
tINT (ms)
RESOLUTION
(LUX/COUNT)
100 1
12 12.8 0.24 6.4
16
8 0.8
3.90 0.4
250
4 0.05
62.5 0.025 4000
REXT = 100kΩ
External Scaling Resistor REXT and fosc
The ISL76683 uses an external resistor REXT to fix its internal
oscillator frequency, fOSC. Consequently, REXT determines the
fOSC, integration time and the FSR of the device. fOSC, a dual
speed mode oscillator, is inversely proportional to REXT. For user
simplicity, the proportionality constant is referenced to fixed
constants 100kΩ and 655kHz:
fosc1 = 12-- × 1---R-0----0E---X-k--T-Ω--- × 655kHz
(EQ. 6)
fosc2 = 1----R0----0E---Xk---T-Ω--- × 655kHz
(EQ. 7)
fOSC1 is oscillator frequency when Range1 or Range2 are set.
This is nominally 327kHz when REXT is 100kΩ.
fOSC2 is the oscillator frequency when Range3 or Range4 are
set. This is nominally 655kHz when REXT is 100kΩ.
wwwW.DhaetnaSthheeeRta4nUg.eco/Gmain bits are set to Range1 or Range2, fOSC
runs at half speed compared to when Range/Gain bits are set to
Range3 and Range4.
fOSC1 = 12-- (fOSC2)
(EQ. 8)
The automatic fOSC adjustment feature allows significant
improvement of signal-to-noise ratio when detecting very low lux
signals.
Integration Time or Conversion Time
Integration time is the period during which the device’s analog-
to-digital ADC converter samples the photodiode current signal
for a lux measurement. Integration time, in other words, is the
time to complete the conversion of analog photodiode current
into a digital signal (number of counts).
Integration time affects the measurement resolution. For better
resolution, use a longer integration time. For short and fast
conversions use a shorter integration time.
The ISL76683 offers user flexibility in the integration time to
balance resolution, speed and noise rejection. Integration time can
be set internally or externally and can be programmed in the
command register 00(hex) bit 5.
INTEGRATION TIME IN INTERNAL TIMING MODE
This timing mode is programmed in the command register
00(hex) bit 5. Most applications will be using this timing mode.
When using the Internal Timing Mode, fOSC and n-bits resolution
determine the integration time. tint is a function of the number of
clock cycles and fOSC.
tint = 2n × f---o-1--s---c
for Internal Timing Mode only
(EQ. 9)
n = 4, 8, 12, and 16. n is the number of bits of resolution.
Therefore, 2n is the number of clock cycles. n can be programmed
at the command register 00(hex) bits 1 and 0.
Since fOSC is dual speed depending on the Gain/Range bit, tint is
dual time. The integration time as a function of REXT and n is:
tint1 = 2n × 3----2----7----k---H--R--z---E--×-X---T1----0---0----k----Ω---
(EQ. 10)
tint1 is the integration time when the device is configured for
Internal Timing Mode and Gain/Range is set to Range1 or
Range2.
tint2 = 2n × 6----5----5----k---H--R--z---E--×-X---T1----0---0----k----Ω---
(EQ. 11)
tint2 is the integration time when the device is configured for
Internal Timing Mode and Gain/Range is set to Range3 or
Range4.
TABLE 13. INTEGRATION TIMES FOR TYPICAL REXT VALUES
REXT
(kΩ)
RANGE1
RANGE2
n = 16-BIT n = 12-BIT
RANGE3
RANGE4
n = 12-BIT
n=4
50 100 6.4 3.2 0.013
100**
200
13
6.5 0.025
200 400
26
13 0.050
500 1000
64
32 0.125
*Integration time in milliseconds
**Recommended REXT resistor value
11 FN7697.1
January 31, 2011
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| PDF Descargar | [ Datasheet ISL76683.PDF ] | |
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