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ISL29015IROZ-EVALZ Datasheet(PDF) 5 Page - Intersil Corporation |
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ISL29015IROZ-EVALZ Datasheet(HTML) 5 Page - Intersil Corporation |
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5 / 13 page  5 FN6522.0 October 31, 2008 programmable continuous proximity sensing. These six modes can be programmed in series to fulfill the application needs. The detailed program configuration is listed in “Register Set” on page 6. When the part is programmed for ambient light sensing, the ambient light with wavelength within the “Ambient Light Sensing” spectral response curve in Figure 6 is converted into current. With ADC, the current is converted to an unsigned n-bit (up to 16 bits) digital output. When the part is programmed for infrared (IR) sensing, the IR light with wavelength within the “IR or Proximity Sensing” spectral response curve on Figure 6 is converted into current. With ADC, the current is converted to an unsigned n-bit (up to 16 bits) digital output. When the part is programmed for proximity sensing, the external IR LED is turned on by the built-in IR LED driver through the IRDR pin. The amplitude of the IR LED current and the IR LED modulation frequency can be programmed through Command Register II. When the IR from the LED reaches an object and gets reflected back, the reflected IR light with wavelength within the “IR or Proximity Sensing” spectral response curve in Figure 6 is converted into current. With ADC, the current is converted to an unsigned n-bit (up to 16 bits) digital output. The output reading is inversely proportional to the square of the distance between the sensor and the object. When there is significant background IR noise like direct sunlight, both IR and proximity sensing can be implemented for background noise cancellation. The differential output reading from the ADC decreases with distance. I2C Interface There are four 8-bit registers available inside the ISL29015. The two command registers define the operation of the device. The command registers do not change until the registers are overwritten. The two 8-bit data Read Only registers are for the ADC output. The data registers contain the ADC's latest digital output, or the number of clock cycles in the previous integration period. The ISL29015’s I2C interface slave address is internally hardwired as 1000100. When 1000100x with x as R or W is sent after the Start condition, this device compares the first seven bits of this byte to its address and matches. Figure 1 shows a sample one-byte read. Figure 2 shows a sample one-byte write. The I2C bus master always drives the SCL (clock) line, while either the master or the slave can drive the SDA (data) line. Figure 2 shows a sample write. Every I2C transaction begins with the master asserting a start condition (SDA falling while SCL remains high). The following byte is driven by the master, and includes the slave address and read/write bit. The receiving device is responsible for pulling SDA low during the acknowledgement period. Every I2C transaction ends with the master asserting a stop condition (SDA rising while SCL remains high). For more information about the I2C standard, please consult the Philips™ I2C specification documents. FIGURE 1. I2C READ TIMING DIAGRAM SAMPLE START W A A A6 A5 A4 A3 A2 A1 A0 W A R7 R6 R5 R4 R3 R2 R1 R0 A A6 A5 A4 A3 A2 A1 A0 W A A A A D7D6 D5 D4 D3 D2D1 D0 13 5 7 13 57 12 3 4 5 6 9 2 4 6 STOP START SDA DRIVEN BY MASTER DEVICE ADDRESS SDA DRIVEN BY ISL29015 DATA BYTE0 REGISTER ADDRESS OUT DEVICE ADDRESS I2C DATA SDA DRIVEN BY MASTER SDA DRIVEN BY MASTER 24 68 92 4 6 8 9 78 1 3 5 7 8 9 I2C SDA I2C SDA I2C CLK IN ISL29015 |
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