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AD7889 Scheda tecnica(PDF) 27 Page - Analog Devices |
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AD7889 Scheda tecnica(HTML) 27 Page - Analog Devices |
27 / 40 page Data Sheet AD7879/AD7889 Rev. D | Page 27 of 40 For master mode operation, the channels to be digitized are written to Control Register 3. Master mode is then selected by writing 11 to the mode bits in Control Register 1. In this mode, the wake-up on touch feature is active; therefore, conversion does not begin immediately. The AD7879/AD7889 wait until the screen is touched before beginning the sequence of conversions. The ADC then digitizes the selected channels, and the results are written to the result registers. Before beginning another sequence of conversions, the AD7879/AD7889 wait for the screen to be touched again or for a timer event if the screen remains touched. ADC Channel (Control Register 1, Bits[14:12]) The ADC channel address is selected by Bits[14:12] of Control Register 1 (CHNL ADD2 to CHNL ADD0). A complete list of channel addresses is given in Table 21. For single-channel conversion, the channel address is selected by writing the appropriate code to the CHNL ADD2 to CHNL ADD0 bits in Control Register 1. For sequential channel conversion, the channels to be converted are selected by setting the bits corresponding to the channel number in Control Register 3 for slave and master mode sequencing. For both single-channel and sequential conversion, a normal conversion (single-ended) is selected by setting the SER/DFR bit in Control Register 2 (Bit 9). Ratiometric (differential) conversion is selected by clearing the SER/DFR bit. PENIRQ Enable (Control Register 1, Bit 15) The AD7879/AD7889 have a dual function output that performs as PENIRQ or INT, depending on the pen interrupt enable bit (Bit 15 of Control Register 1). When this bit is set to 0, the pin functions as a pen interrupt and goes low whenever the screen is touched. When the pen interrupt enable bit is set to 1, the pen interrupt request is disabled and the pin functions as an interrupt when a measurement exceeds a preprogrammed limit (INT). Table 21. Codes for Selecting Input Channel and Normal or Ratiometric Conversion Channel SER/DFR CHNL ADD[2:0] Analog Input X Switches Y Switches REF+ REF− 0 0 111 X+ (Y position) Off On Y+ Y− 1 0 110 Y+ (X position) On Off X+ X− 2 0 101 X+ (Z1 touch pressure) X+ off, X− on Y+ on, Y− off Y+ X− 3 0 100 Y− (Z2 touch pressure) X+ off, X− on Y+ on, Y− off Y+ X− 4 0 011 AUX Off Off V CC GND 5 0 010 VBAT Off Off V CC GND 6 0 001 TEMP Off Off V CC GND 0 000 Invalid address 7 1 111 X+ (Y position) Off On V CC GND 8 1 110 Y+ (X position) On Off V CC GND 9 1 101 X+ (Z1 touch pressure) Off Off V CC GND 12 1 100 Y− (Z2 touch pressure) Off Off V CC GND 13 1 011 AUX Off Off V CC GND 14 1 010 VBAT Off Off V CC GND 15 1 001 TEMP Off Off V CC GND 1 000 Invalid address |
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