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ISL29011IROZ-EVALZ Datasheet(PDF) 6 Page - Intersil Corporation |
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ISL29011IROZ-EVALZ Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 16 page 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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