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SS7646TR Datasheet(PDF) 9 Page - Silicon Standard Corp. |
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SS7646TR Datasheet(HTML) 9 Page - Silicon Standard Corp. |
9 / 13 page www.SiliconStandard.com 4 of 5 SS7646 8/21/2004 Rev.2.01 Reference Input The voltage difference between +REF and –REF (shown VREF in Figure 5), in the range of 1V to + VDD, sets the Analog-to-Digital converter (ADC) input range. The full-scale analog input range of the SS7646 is therefore from 0 to V REF. Typically the reference input is an external precise voltage source VREF (MODE0=1, see Table IV) for touch screen and auxiliary inputs measurement. Figure 6 shows the configuration for a Y coordinate measurement with MODE0=1. When utilizing the panel measurement, the VREF must equal VDD as input range is from 0 to VDD. If the reference input is from the power supply directly, as Figure 12 shows for example, special care must be taken to avoid noise from the power supply. When making touch screen measurements only, the reference input can be set from VDD directly (MODE0=0) and discard the VREF input. Figure 7 shows the configuration for a Y coordinate measurement with MODE0=0. Examples of DIN Configuration Table VI shows DIN configurations for specified applications. ADC VREF A2A1A0 (Shown 101) +REF -REF MODE0 = 1 IN X+ VDD GND Y- Y+ VDD GND Internal 2.5V Reference Figure 6. Touch Screen Measurement with MODE0=1 ADC VREF A2A1A0 (Shown 101) +REF -REF MODE0 = 0 IN X+ VDD GND Y- Y+ VDD GND Internal 2.5V Reference Figure 7. Touch Screen Measurement with MODE0=0 Measurement S A2 A1 A0 MODE1 MODE0 PD1 PD0 +REF X SWITCHES Y SWITCHES Touch Screen Y-Position (X+) 1 0 0 1 0 0 / 1 0 0 VDD / VREF OFF ON X-Position (Y+) 1 1 0 1 0 0 / 1 0 0 VDD / VREF ON OFF Z1-Position (X+) 1 0 1 1 0 0 / 1 0 0 VDD / VREF X+ OFF, X- ON Y+ ON , Y- OFF Z2-Position (Y -) 1 1 0 0 0 0 / 1 0 0 VDD / VREF X+ OFF, X- ON Y+ ON , Y- OFF Battery VBAT 1 0 1 0 0 1 1 1 VREF OFF OFF - 1 0 1 0 * 0 * * Invalid Configuration Auxiliary In. VIN 1 1 1 0 0 1 1 1 VREF OFF OFF - 1 1 1 0 * 0 * * Invalid Configuration Temperature TEMP1 1 1 1 1 0 1 1 1 VREF OFF OFF TEMP0 1 0 0 0 0 1 1 1 VREF OFF OFF - 1 1 1 1 * 0 * * Invalid Configuration - 1 0 0 0 * 0 * * Invalid Configuration Table VI . Examples of DIN Configuration |
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