IS31SE5100-QFLS2-EB ISSI

IS31SE5100 8-CH CAPACITIVE TOUCH SENSOR DESCRIPTION RECOMMENDED EQUIPMENT The IS31SE5100 is an ultra low power, fully integrated 5.0V, 500mA power supply solution for capacitive touch applications with up to 8 surfaces. The chip allows electrodes to project sense fields through any dielectric such as glass or plastic. ABSOLUTE MAXIMUM RATINGS On-chip calibration logic continuously monitors the environment and automatically adjusts on-and-off 5.5V power supply threshold levels to prevent false sensor activation. Caution: Do not exceed the conditions listed above, otherwise the board will be damaged. The IS31SE5100 is fully programmable via a 400kHz I2C serial bus protocol. PROCEDURE FEATURES The IS31SE5100 evaluation board is fully assembled and tested. Follow the steps listed below to verify Supply voltage from 2.7V to 5.5V board operation. I2C interface, 1.8V/2.8V is allowed Caution: Do not turn on the power supply until all connections Auto offset compensation are completed. Fully integrated sense controller with eight 1) Connect the ground lead of the power supply to capacitive touch inputs the EVB GND terminal and the positive lead to the Interrupt driven output EVB VCC terminal. Or use the connector (DC IN) Adjustable sensitivity with external capacitor or by with a power adaptor: jack size 3.5mm x 1.35mm. internal register 2) Turn on the power supply and pay attention to the supply current. If the current exceeds 100mA, Low power consumption please check for a circuit fault. ESD HBM 8kV IC controller in QFN-24 (4mm 4mm) EVALUATION BOARD OPERATION This evaluation board is controlled by a QUICK START pre-programmed P89LPC922 (80C51 core). IS31SE5100 evaluation board has 8 touch surfaces designed on a 2mm thick acrylic board to induce a dielectric. Each touch surface has an associated LED that will light when the corresponding surface area is touched. C BODY LED C PCB IS31SE5100 Figure 2: Capacitance Detection The capacitance (C ) of an approaching finger BODY increases as it approaches the sense area. The Figure 1: Photo of IS31SE5100 Evaluation Board IS31SE5100 detects this increase in capacitance and turns on the associated LED. SOFTWARE SUPPORT Please refer to the integrated program. Please refer to the datasheet for more information. Lumissil Microsystems www.lumissil.com 1 Rev. A, 07/25/2013 IS31SE5100 8-CH CAPACITIVE TOUCH SENSOR ORDERING INFORMATION Part No. Temperature Range Package IS31SE5100-QFLS2-EB -40C ~ +85C (Industrial) QFN-24, Lead-free Table1: Ordering Information For pricing, delivery, and ordering information, please contacts Lumissils analog marketing team at analog Lumissil.com or (408) 969-6600. U2 3.0V 1 15 P0.0/CMP2/KBI0 VDD GND SCL 20 U3 1 P0.1/CIN2B/KBI1 RST SDA 19 2 P0.2/CIN2A/KBI2 PDA SDB 18 C6 VCC 3.0V 3 P0.3/CIN1B/KBI3 PCL PDA 17 0.1uF VCC 1 5 4 P0.4/CIN1A/KBI4 VDD VOUT 3.0V PCL 16 5 5 P0.5/CMPREF/KBI5 VSS 14 P0.6/CMP1/KBI6 ICP 13 3 P0.7/T1/KBI7 10uF C1 SD C3 C5 0.1uF 10uF DC INPUT C4 TXD 12 2 4 P1.0/TXD GND BP RXD 11 P1.1/RXD RXD 10 10nF 3 P1.2/T0/SCL TXD 9 6 2 P1.3/INT0/SDA P3.1/XTAL1 LDO INTB 8 1 P1.4/INT1 RST 4 7 P1.5/RST P3.0XTAL2/CLKOUT 3 P1.6 2 P1.7 VCC LPC922 R4 R1 R3 R2 10K 10K 4.7K 4.7K U1 VCC VCC 2 15 SDB VCC SD KEY1 14 INTB INTB 13 SDA SDA C2 12 SCL SCL KEY2 0.1uF 11 D7 D6 D4 D2 D1 D8 D5 D3 AD 1 GND 19 GND KEY3 R20 R5 510 3 24 1K Cap1 OUT8 R19 KEY4 R6 510 4 23 1K Cap2 OUT7 R7 510 5 22 R18 1K Cap3 OUT6 KEY5 R17 1K R8 510 6 21 Cap4 OUT5 R16 KEY6 R9 510 7 20 1K Cap5 OUT4 R10 510 8 18 R15 1K Cap6 OUT3 KEY7 R14 R11 510 9 17 1K Cap7 OUT2 R13 KEY8 R12 510 10 16 1K Cap8 OUT1 C7 C8 C9 C10 C11 C12 C13 C14 IS31SE5100 5pF 5pF 5pF 5pF 5pF 5pF 5pF 5pF Figure 3: IS31SE5100 Application Schematic Lumissil Microsystems www.lumissil.com 2 Rev. A, 07/25/2013