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ISL29011IROZ-EVALZ Datasheet(PDF) 6 Page - Intersil Corporation

Part # ISL29011IROZ-EVALZ
Description  Digital Ambient Light Sensor and Proximity Sensor with Interrupt Function
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL29011IROZ-EVALZ Datasheet(HTML) 6 Page - Intersil Corporation

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6
FN6467.4
May 5, 2011
Principles of Operation
Photodiodes and ADC
The ISL29011 contains two photodiode arrays which convert
light into current. The spectral response for ambient light
sensing and IR sensing is shown in Figure 7 in the performance
curves section. After light is converted to current during the light
signal process, the current output is converted to digital by a
built-in 16-bit Analog-to-Digital Converter (ADC). An I2C
command reads the ambient light or IR intensity in counts.
The converter is a charge-balancing integrating type 16-bit
ADC. The chosen method for conversion is best for converting
small current signals in the presence of an AC periodic noise. A
100ms integration time, for instance, highly rejects 50Hz and
60Hz power line noise simultaneously. See “Integration and
Conversion Time” on page 10.
The built-in ADC offers user flexibility in integration time or
conversion time. Integration time is determined by an internal
oscillator (fOSC), and the n-bit (n = 4, 8, 12,16) counter inside
the ADC. A good balancing act of integration time and
resolution depending on the application is required for optimal
results.
The ADC has I2C programmable range select to dynamically
accommodate various lighting conditions. For very dim
tSU:STO
Set-up Time for STOP Condition
600
ns
tBUF
Bus Free Time Between a STOP and START
Condition
1300
ns
Cb
Capacitive Load for Each Bus Line
400
pF
Rpull-up
SDA and SCL system bus pull-up resistor
Maximum is determined by tR and tF
1k
Ω
tVD;DAT
Data Valid Time
0.9
µs
tVD:ACK
Data Valid Acknowledge Time
0.9
µs
VnL
Noise Margin at the LOW Level
0.1VDD
V
VnH
Noise Margin at the HIGH Level
0.2VDD
V
NOTE:
9. All parameters in I2C Electrical Specifications table are guaranteed by design and simulation.
I2C Electrical Specifications
For SCL and SDA unless otherwise noted, VSUP(VDDD,VDDA) = 3V, TA = +25°C, REXT = 499kΩ 1%
tolerance, 16-bit ADC operation (Note 9).
PARAMETER
DESCRIPTION
CONDITION
MIN
TYP MAX UNIT
FIGURE 1. I2C TIMING DIAGRAM
ISL29011


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