LC717A30UJ CapacitanceDigitalConverter LSI for Electrostatic Capacitive Touch Sensors The LC717A30UJ 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 LC717A30UJ 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 SPI). Features SSOP30 (225 mil) Differential Capacitive Detection Using Mutual Capacitance CASE 565AZ Operates with Small to Large Capacitance Sensor Input Pads MARKING DIAGRAM Capacitance Detection Down to Femto-Farad Level Measurement Time 16 ms for 8 Sensors Minimal External Components XXXXXXXXXX 2 Selectable Interface: I C or SPI YMDDD Current Consumption: 0.8 mA (V = 5.5 V) DD Supply Voltage: 2.6 V to 5.5 V AECQ100 Qualified and PPAP Capable XXXXX = Specific Device Code 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 Industrial: Security Lock See detailed ordering and shipping information on page 9 of 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 LC717A30UJ Figure 1. Application Schematic 1 Semiconductor Components Industries, LLC, 2016 1 Publication Order Number: January, 2018 Rev. 1 LC717A30UJ/DLC717A30UJ 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 LC717A30UJ 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 LC717A30UJ Figure 3. Application Schematic 3 www.onsemi.com 2