IS31SE5104 4-CH CAPACITIVE TOUCH SENSOR EVALUATION BOARD GUIDE
Integrated Silicon Solution, Inc. – www.issi.com
1
Rev. A, 11/19/2014
DESCRIPTION
The IS31SE5104 is an ultra low power, fully integrated
solution for capacitive touch applications with up to 4
surfaces. The chip allows electrodes to project sense
fields through any dielectric such as glass or plastic.
On-chip calibration logic continuously monitors the
environment and automatically adjusts on-and-off
threshold levels to prevent false sensor activation.
The IS31SE5104 is fully programmable via a 400kHz
I2C serial bus protocol.
FEATURES
Supply voltage from 2.7V to 5.5V
I2C interface, 1.8V/2.8V is allowed
Auto offset compensation
Fully integrated sense controller with 4 capacitive
touch inputs
Interrupt driven output
Adjustable
sensitivity
with
external capacitor or by
internal register
Low power consumption
ESD HBM 8kV
IC controller in QFN-16 (3mm × 3mm)
QUICK START
Figure 1: Photo of IS31SE5104 Evaluation Board
RECOMMENDED EQUIPMENT
5.0V, 500mA power supply
ABSOLUTE MAXIMUM RATINGS
≤
5.5V power supply
Caution: Do not exceed the conditions listed above, otherwise
the board will be damaged.
PROCEDURE
The IS31SE5104 evaluation board is fully assembled
and tested. Follow the steps listed below to verify
board operation.
Caution: Do not turn on the power supply until all connections
are completed.
1) Connect the ground lead of the power supply to
the EVB GND terminal and the positive lead to the
EVB VCC terminal. Or use the connector (DC IN)
with a power adaptor: jack size 3.5mm x 1.35mm.
2) Turn on the power supply and pay attention to the
supply current. If the current exceeds 100mA,
please check for a circuit fault.
EVALUATION BOARD OPERATION
This evaluation board is controlled by a
pre-programmed P89LPC922 (80C51 core).
IS31SE5104 evaluation board has 4 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.
Figure 2: Capacitance Detection
The capacitance (C
BODY
) of an approaching finger
increases as it approaches the sense area. The
IS31SE5104 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.
C
BODY
C
PCB
IS31SE5104
LED
