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WM9712CLGEFL/V датащи(PDF) 9 Page - Wolfson Microelectronics plc |
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WM9712CLGEFL/V датащи(HTML) 9 Page - Wolfson Microelectronics plc |
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9 / 78 page ![]() Production Data WM9712L w PD, Rev 4.6, November 2011 9 TOUCHPANEL AND AUXILIARY ADC Test Conditions DBVDD=3.3V, DCVDD = 3.3V, AVDD = TPVDD = 3.3V, TA = +25 oC, MCLK = 24.576 MHz, unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Input Pins X+, X-, Y+, Y-, WIPER/AUX4, COMP1/AUX1, COMP2/AUX2 and BMON/AUX3 Input Voltage AGND AVDD V Input leakage current AUX pin not selected as AUX ADC input <10 nA ADC Resolution 12 bits Differential Non-Linearity Error DNL 0.25 1 LSB Integral Non-Linearity Error INL 2 LSB Offset Error 4 LSB Gain Error 6 LSB Power Supply Rejection PSRR 50 dB Throughput Rate DEL = 1111 (zero settling time) 48 kHz Settling Time (programmable) MCLK = 24.576MHz 0 6 ms Conversion Time Note: touch pressure measurements require two conversions 20.8 s Switch matrix resistance 12 Programmable Pull-up resistor RPU RPU = 000001 55 63 70 k Pen down detector threshold VDD/2 V Pressure measurement current IP PIL = 1 400 A PIL = 0 200 BMON/AUX3 (pin 31 only) Input Range AVDD = 3.3V AGND 5 V AVDD = 1.8V AGND 3.3 V Scaling -3% 1/3 +3% Input Resistance (Note 1) during measurement 30 k average over time 30 / duty cycle Note: 1. Current only flows into pin 31 during a measurement. At all other times, BMON/AUX3 is effectively an open circuit. COMPARATORS Test Conditions AVDD = 3.3V, TA = +25 oC, unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT COMP1/AUX1 and COMP2/AUX2 (pins 29, 30) Input Voltage AGND AVDD V Input leakage current pin not selected as AUX ADC input <10 nA Comparator Input Offset (COMP1, COMP2 only) -50 +50 mV COMP2 delay (COMP2 only) 24.576MHz crystal 0 10.9 s |
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