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QT111-I Datasheet(PDF) 5 Page - Quantum Research Group |
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QT111-I Datasheet(HTML) 5 Page - Quantum Research Group |
5 / 6 page 5.5 DC SPECIFICATIONS VDD = 3.0V, CS = 10NF, CX = 10PF, TA = RECOMMENDED RANGE Typical, see figs 1, 2; Note 1, 2 fF 28 - 1,000 Sensitivity range S Cs = 10nF to 100nF µA 700 Supply current, slave mode IDD Cs = 10nF to 100nF µA 60 Supply current, master mode IDD Notes Units Max Typ Min Description Parameter Note 1: All percentage thresholds have been eliminated and replaced with a fixed threshold w.r.t. reference level Note 2: Sensitivity depends on value of Cx and Cs. Refer to Charts 1, 2. Piezo Driver Note The piezo acoustic driver has been removed, as the duration required to operate the beeper would interfere with the sensing interval and slow down the device. Sensitivity Adjustment Note The device has a fixed threshold point of 6 counts of deviation. Gain pin adjustment (pin 5) has been eliminated and replaced with a strap option for Master / Slave mode: Gnd Slave Vdd Master Tie Pin 5 to: Mode Table 1-1 Master/Slave Strap Options The sensitivity of the circuit is governed by the relative sizes of Cs and Cx. A detection is made if the signal rises by 6 counts from the reference level; this amount, unlike the QT110, is not ratiometric to the signal level and therefore the sensitivity can be altered by simply changing Cs. To provide a consistent level of sensitivity, only stable types of capacitors are recommended for Cs, such as NPO, C0G, PPS film, and certain types of polycarbonate when used over normal room temperature ranges. Larger values of Cs will make the sensor more sensitive, while larger amounts of Cx will desensitize it (see Charts 1, 2). Minimizing stray Cx is crucial if high levels of sensitivity are desired. By using values of Cs around 0.47uF (470nF), proximity distances of several centimeters can easily be obtained from small electrodes. NOTE: It is extremely important to maintain stable levels of Vdd, as the supply is used as a reference. Minor fluctuations in Vdd WILL cause false triggers or rapid swings in gain. DO NOT use bench power supplies or supply circuits shared with other digital functions. Ordinary 78L05 class regulators are fine in almost all cases. The QT115 is an extremely sensitive device... do not take power supply issues lightly. Pin Functions The QT115 pins are defined as shown: Ground, 0V Gnd 8 QT Sense pin 2 SNS2 7 QT Sense pin 1 SNS1 6 Vdd = Master mode, Gnd = Slave mode (strap option) Master/Slave select 5 >10us, <50us negative pulse input to trigger in slave mode In Master Mode: Connect to either Gnd or Vcc. Sync Pulse In (slave mode only) 4 20us nominal negative sync pulse Sync Pulse Out (master or slave mode) 3 Active-low output Out 2 Power, +3V to +5V Vdd 1 Description Function PIN Table 2-1 QT115 Pin Functions Quantum Research Group Ltd. 4 August 2004 QT113 QProx™ 8-pin Sensor © 1999 QRG Ltd. |
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