LC717A30UR CapacitanceDigitalConverter LSI for Electrostatic Capacitive Touch Sensors The LC717A30UR is a high performance, low cost, and highly usable capacitance converter for electrostatic capacitive touch and www.onsemi.com proximity sensors. 8 capacitance-sensing input channels ideal for use in any end products that needs an array of switches. The LC717A30UR facilitates a short system development time through its automatic calibration function and minimal external components. The detection result 2 (ON/OFF) for each sensor is read out by the serial interface (I C or Top View Bottom View SPI). VCT28 3.5 3.5 Features CASE 601AE Differential Capacitive Detection Using Mutual Capacitance MARKING DIAGRAM Operates with Small to Large Capacitance Sensor Input Pads Capacitance Detection Down to Femto-Farad Level Measurement Time 16 ms for 8 Sensors XXXXXXXX Minimal External Components YMDDD 2 Selectable Interface: I C or SPI Current Consumption: 0.8 mA (V = 5.5 V) DD Supply Voltage: 2.6 V to 5.5 V XXXXX = Specific Device Code AECQ100 Qualified and PPAP Capable Y = Year M = Month Typical Applications DDD = Additional Traceability Data Automotive: Smart Key, Control Switches, Car Audio, Proximity Consumer: Home Appliance, White Goods, Induction Cooking ORDERING INFORMATION See detailed ordering and shipping information on page 9 of Industrial: Security Lock this data sheet. Computing: PC Peripherals, Audio Visual Equipment Lighting: Remote Control Switches Cref Cref CrefAdd CdrvBar nCS SCL/SCK CMAdd0 2 I C/SPI SDA/SI CMAdd4 Main SA0/SO Cin0 SW1 Microcomputer Cin1 SW2 GPIO nRST EXTINT Cin6 SW7 INOUT SW8 Cin7 V or V DD SS IFSEL Cdrv LC717A30UR Figure 1. Application Schematic 1 Semiconductor Components Industries, LLC, 2018 1 Publication Order Number: November, 2018 Rev. 0 LC717A30UR/DLC717A30UR 8 small capacitance sensors channels and 4-wire SPI interface. 4 pF (open) Cref CrefAdd CdrvBar nCS (open) SCL/SCK SDA/SI CMAdd0 (open) Main SA0/SO Microcomputer CMAdd4 (open) Cin0Cin0 GPIO nRST SW1 (Small capacitance: e.g. 4 pF) EXTINT INTOUT Cin1Cin1 SW2 (Small capacitance: e.g. 4 pF) Cin2Cin2 SW3 (Small capacitance: e.g. 4 pF) Cin3Cin3 SW4 (Small capacitance: e.g. 4 pF) Cin4 SW5 (Small capacitance: e.g. 4 pF) IFSEL Cin5 SW6 (Small capacitance: e.g. 4 pF) Cin6 SW7 (Small capacitance: e.g. 4 pF) Cin7 SW8 (Small capacitance: e.g. 4 pF) Cdrv LC717A30UR Figure 2. Application Schematic 2 2 8 large capacitance sensors and I C interface. 20 pF 16 pF VDD (open) Cref CrefAdd CdrvBar nCS SCL/SCK 16 pF SDA/SI CMAdd0 SA0/SO Main 16 pF Microcomputer CMAdd4 nRST Cin0 SW1 (Big capacitance: e.g. 20 pF) GPIO EXTINT INTOUT Cin1 SW2 (Big capacitance: e.g. 20 pF) Cin2 SW3 (Big capacitance: e.g. 20 pF) Cin3 VDD SW4 (Big capacitance: e.g. 20 pF) Cin4 SW5 (Big capacitance: e.g. 20 pF) IFSEL Cin5 SW6 (Big capacitance: e.g. 20 pF) Cin6 SW7 (Big capacitance: e.g. 20 pF) Cin7 SW8 (Big capacitance: e.g. 20 pF) Cdrv LC717A30UR Figure 3. Application Schematic 3 www.onsemi.com 2