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WM9713 Datasheet(PDF) 64 Page - Wolfson Microelectronics plc |
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WM9713 Datasheet(HTML) 64 Page - Wolfson Microelectronics plc |
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64 / 111 page  WM9713L Preliminary Technical Data 1 PTD, March 2004, Rev 2.2 64 POWER MANAGEMENT To save power, the touchpanel digitiser and the pen-down detector can be independently disabled when they are not used. The power consumption of the pen-down detector is normally negligible, except when the pen is down. The pen ADC is powered-down using PADCPD, register 3Ch bit 15. The state of the digitiser and pen down detector is controlled by the following bits. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 3Ch 15 PADCPD 1 = off Pen ADC power down 15:14 PRP 00 Pen ADC/AUX ADC enable 00 – Pen digitiser off, pen detect off, no wake-up on pen down (default) 01 – Pen digitiser powered off, pen detect enabled, touchpanel digitiser wakes up (changes to state 11) on pen-down 10 – Pen digitiser off, pen detect enabled, no wake-up on pen down 11 – Pen digitiser and pen detect enabled 78h 13 RPR 0 Wake-up on pen-down mode 0: Wake-up the AC-Link only (hold SDATAIN high until controller sends warm reset or cold reset) 1: Wake-up the WM9713L without waiting for a reset signal from the controller Table 46 Touchpanel Digitiser Control (Power Management) |
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