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STA1095 Datasheet(PDF) 69 Page - STMicroelectronics |
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STA1095 Datasheet(HTML) 69 Page - STMicroelectronics |
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69 / 127 page  DS13319 Rev 2 69/127 STA108x, STA109x Electrical Characteristics 126 4.10 Touch Screen Controller (TSC) Electrical Characteristics The following table lists the electrical characteristics of the TSC. 4.11 Regulator Specifications 4.11.1 Always-on LDO (3V3 TO 1V2 Low Power Regulator) Table 32. Touch screen controller Symbol Parameter Conditions Min Typ Max Unit VDDTSC SR Full scale voltage input span(1) - 3.0 3.3 3.6 V CIN S Total input capacitance(2) -- - 13 pF ILEAK S Input leakage - -2 - +2 µA tSETTLE S Panel settling time(3) -0.01 - 100 ms tTOUCH S Touch detect delay(3) -0.01 - 50 ms RON-P P Y+, X+ drivers on resistance IOH = -30 mA - - 12 RON-N P Y-, X- drivers on resistance IOL = +30 mA - - 13 IPANEL P Panel driver current capability - - - 30 mA VTOUCH P Touch detect comparator threshold(4) VDDTSC = 3.0 V 2.1 - - V VTOHYS S Touch detect comparator hysteresis - 300 - - mV 1. It is the same as ADC voltage reference range. 2. Equivalent to Cp1 + Cp2 + Cs in ADC section. 3. Controlled by the Touch Screen Configuration Register (TSCCONFIG). 4. Measured as VIH on X+ input. Table 33. 3V3 TO 1V2 Low Power Regulator Symbol Parameter Limit values Unit Min Typ Max VASupply SR Analog Supply 3.0 3.3 3.6 V Vout(@100µA) P Output Voltage @ Iload = max 1.14 1.2 1.26 V Cload SR Total off chip capacitance value(1) -- 2.2 nF PSRR S Power supply rejection at DC @ Full load - -50 -40 dB PSRR S Power supply rejection at 1MHz @ Full load --50 -40 dB Tstart S Start up time from power down to active - - 500 µs 1. This is mandatory for proper device functionality. |
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