Rainbow-electronics AT42QT1040 User Manual

Features• Number of Keys: –Up to 4 • Discrete Outputs: – 4 discrete outputs indicating individual key touch• Technology: – Patented spread-spectrum ch

109524A–AT42–03/09AT42QT10404.4 CalibrationCalibration is the process by which the sensor chip assesses the background capacitance oneach channel. Dur

119524A–AT42–03/09AT42QT1040 Bit 7: This bit is set during calibrationBits 4 – 6: Contains the number of keys activeBits 0 – 3: Show the touch stat

129524A–AT42–03/09AT42QT1040Figure 4-3. Byte Following Byte (~ 30 µs Period)Figure 4-4. Full Debug Send (30 Bytes)Figure 4-5. Debug Lines Floating Bet

139524A–AT42–03/09AT42QT10405. Specifications 5.1 Absolute Maximum Specifications5.2 Recommended Operating Conditions5.3 DC SpecificationsVdd -0.5 to

149524A–AT42–03/09AT42QT10405.4 Timing Specifications5.5 Power ConsumptionParameter Description Min Typ Max Units NotesTBS Burst duration – 3.5 – ms C

159524A–AT42–03/09AT42QT10405.6 Mechanical DimensionsTITLE DRAWING NO. GPC REV. Package Drawing Contact: [email protected] 20M2 ZFC B20M2

169524A–AT42–03/09AT42QT10405.7 MarkingEither of the following two markings may be used:Program Week Code Number 1-52 Where:A = 1 B = 2 ... Z = 26 the

179524A–AT42–03/09AT42QT10405.8 Part Number 5.9 Moisture Sensitivity Level (MSL)Revision HistoryPart Number DescriptionAT42QT1040-MMH 20-pin 3 x 3 mm

9524A–AT42–03/09Headquarters InternationalAtmel Corporation2325 Orchard ParkwaySan Jose, CA 95131USATel: 1(408) 441-0311Fax: 1(408) 487-2600Atmel Asia

29524A–AT42–03/09AT42QT10401. Pinout and Schematic1.1 Pinout ConfigurationI/O CMOS input and output OD CMOS open drain output P Ground or powerTable

39524A–AT42–03/09AT42QT10401.2 SchematicFigure 1-1. Typical Circuit Suggested regulator manufacturers: • Torex (XC6215 series)• Seiko (S817 series)• B

49524A–AT42–03/09AT42QT10402. Overview of the AT42QT10402.1 IntroductionThe AT42QT1040 (QT1040) is a digital burst mode charge-transfer (QT™) capaciti

59524A–AT42–03/09AT42QT1040The use of AKS is selected by connecting a 1 M resisitor between Vdd and the SNSK0 pin(see Section 4.1 on page 8 for more

69524A–AT42–03/09AT42QT10403. Wiring and Parts3.1 Cs Sample CapacitorsCs0 – Cs3 are the charge sensing sample capacitors; normally they are identical

79524A–AT42–03/09AT42QT10403.5 Power SupplySee Section5.2 on page13 for the power supply range. If the power supply fluctuates slowlywith temperature,

89524A–AT42–03/09AT42QT10404. Detailed Operations4.1 Adjacent Key SuppressionThe use of AKS is selected by the connection of a 1 M resistor (RAKS res

99524A–AT42–03/09AT42QT1040Figure 4-1. ~500 ns Pulse On OUT2 Pin4.3 Speed SelectionSpeed selection is determined by a 1 M resistor (RFS resistor) con