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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ISL29030AIROZ-EVALZ 데이터시트(PDF) 9 Page - Intersil Corporation |
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ISL29030AIROZ-EVALZ 데이터시트(HTML) 9 Page - Intersil Corporation |
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9 / 16 page  ISL29030A 9 FN7722.0 November 18, 2010 The proximity sensor is an 8-bit ADC which operates in a similar fashion. When proximity sensing is enabled, the IRDR pin will drive a user-supplied infrared LED, the emitted IR reflects off an object (i.e., a human head) back into the ISL29030A, and a sensor converts the reflected IR wave to a current signal in 0.54ms. The ADC subtracts the IR reading before and after the LED is driven (to remove ambient IR such as sunlight), and converts this value to a digital count stored in Register 0x8. The ISL29030A is designed to run two conversions concurrently: a proximity conversion and an ALS (or IR) conversion. Please note that because of the conversion times, the user must let the ADCs perform one full conversion first before reading from I2C Registers PROX_DATA (wait 0.54ms) or ALSIR_DT1/2 (wait 100ms). The timing between ALS and Prox conversions is arbitrary (as shown in Figure 3). The ALS runs continuously with new data available every 100ms. The proximity sensor runs continuously with a time between conversions decided by PROX_SLP (Register 1 Bits [6:4]). Ambient Light and IR Sensing The ISL29030A is set for ambient light sensing when Register bit ALSIR_MODE = 0 and ALR_EN = 1. The light-wavelength response of the ALS appears as shown in Figure 6. ALS measuring mode (as opposed to IR measuring mode) is set by default. When the part is programmed for infrared (IR) sensing (ALSIR_MODE = 1; ALS_EN = 1), infrared light is converted into a current and digitized by the same ALS ADC. The result of an IR conversion is strongly related to the amount of IR energy incident on our sensor, but is unitless and is referred to in digital counts. Proximity Sensing When proximity sensing is enabled (PROX_EN = 1), the external IR LED is driven for 0.1ms by the built-in IR LED driver through the IRDR pin. The amplitude of the IR LED current depends on Register 1 bit 3: PROX_DR. If this bit is low, the load will see a fixed 110mA current pulse. If this bit is high, the load on IRDR will see a fixed 220mA current pulse as seen in Figure 4. When the IR from the LED reaches an object and gets reflected back into the ISL29030A, the reflected IR light is converted into current as per the IR spectral response shown in Figure 7. One entire proximity measurement takes 0.54ms for one conversion (which includes 0.1ms spent driving the LED), and the period between proximity measurements is decided by PROX_SLP (sleep time) in Register 1 Bits 6:4. Average LED driving current consumption is given by Equation 1. A typical IRDR scheme is 220mA amplitude pulses every 800ms, which yields 28μA DC. Total Current Consumption Total current consumption is the sum of IDD and IIRDR. The IRDR pin sinks current (as shown in Figure 4) and the average IRDR current can be calculated using Equation 1. IDD depends on voltage and the mode-of- operation as seen in Figure 11. ALS ACTIVE 100ms 100ms 100ms PROX SENSOR ACTIVE IRDR (CURRENT DRIVER) ALS CONVERSION TIME = 100ms (FIXED) 0.54ms FOR PROX CONVERSION SERIES OF CURRENT PULSES TOTALING 0.1ms SLEEP TIME (PROX_SLP) 100ms 100ms SEVERAL µs BETWEEN CONVERSIONS TIME TIME TIME FIGURE 3. TIMING DIAGRAM FOR PROX/ALS EVENTS - NOT TO SCALE FIGURE 4. CURRENT DRIVE MODE OPTIONS PIN 8 - IRDR 220mA (PROX_DR = 1) (IRDR IS HI-Z WHEN NOT DRIVING) 110mA (PROX_DR = 0) IlRDR AVE ; IlRDR PEAK ; 100 μs × TSLEEP -------------------------------------------------------- = (EQ. 1) |
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