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BL2046TS Datasheet(PDF) 8 Page - SHANGHAI BELLING CO., LTD. |
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BL2046TS Datasheet(HTML) 8 Page - SHANGHAI BELLING CO., LTD. |
8 / 21 page BL2046 Figure 3. Diagram of Differential Reference (SER/ low, Y switches enabled, X+ is analog input). Touch Screen Setting In some applications, external capacitors may be required across the touch screen for filtering noise picked up by the touch screen. These capacitors provide a low-pass filter to reduce the noise, but cause a settling time requirement when the panel is touched that typically shows up as a gain error. There are several methods for minimizing or eliminating this issue. The problem is the input and/or reference has not settled to the final steady-state value prior to the ADC sampling the input(s) and providing the digital output. Additionally, the reference voltage may still be changing during the measurement cycle. Option 1 is to stop or slow down the BL2046 DCLK for the required touch screen settling time. This allows the input and reference to have stable values for the Acquire period (3 clock cycles of the BL2046; see Figure 7). This works for both the single-ended and the differential modes. Option 2 is to operate the BL2046 in the differential mode only for the touch screen measurements and command the BL2046 to remain on (touch screen drivers ON) and not go into power-down (PD0 = 1). Several conversions are made depending on the settling time required and the BL2046 data rate. Once the required number of conversions have been made, the processor commands the BL2046 to go into its power-down state on the last measurement. This process is required for X-Position, Y-Position, and Z-Position measurements. Option 3 is to operate in the 15 Clock-per-Conversion mode, which overlaps the analog-to-digital conversions and maintains the touch screen drivers on until commanded to stop by the processor (see Figure 11). Tempeature Mesurement http://www.belling.com.cn - 8 - Total 8 Pages |
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