Sensing Solutions EVM GUI
8
SNOU144 – December 2016
Copyright © 2016, Texas Instruments Incorporated
LDC2114 Evaluation Module for Inductive Touch Inductance to Digital
Converter
The EVM has the following features, as shown in
1. Power indication LED: this LED shows that the PCB is powered through the USB cable
2. MSP430 GPIO headers: This is a multi-purpose GPIO header which facilitates connection with a
second I2C interface, JTAG, UART, and three additional GPIOs. It also contains 5V, 3.3V, and GND
rails. These pins could be used for example to connect a haptics driver or an audio amplifier. Note that
functionality pof these pins is not implemented in the default EVM firmware.
3. Sensor capacitors: These are the sensor capacitors of the LDC2114. Replace them with suitable
values if appropriate.
4. Alternative connection for UTP cables: Custom sensors can be connected to these header
connections. Unshielded twisted pair (UTP) wires are the preferred wire choice for the sensor.
5. ZIF connector for LDCTOUCHCOMCOILEVM: Sensors of this PCB can be connected easily by
connecting the supplied flat ribbon cable.
6. BSL jumper connection: If firmware upgrade is unsuccessful, put the MSP430 into bootstrap loader
mode by shorting these two pins while powering up the EVM.
7. Micro-USB connector: connect to the PC using a micro-USB cable
8. Force touch LEDs: these eight LEDs show the intensity of the button press. They default firmware
chooses the channel with the strongest button push to indicate intensity.
9. MSP430 F5528: This microcontroller is used to configure the LDC2114, facilitate data streaming to the
GUI, and to show the intensity of the button press.
10. Perforation and probing header: These pads can be used for probing any signals between the
MSP430 and the LDC2114. It can be populated with a standard 2x11 pin 2.54mm header for ease of
access. It is also possible to break the LDC along the perforation and attach a different microcontroller
to these pins. The signals of the header are: [1-2]: OUT3, [3-4]: OUT2, [5-6]: OUT1, [7-8]: OUT0, [9-
10]: INTB, [11-12]: LPWRB, [13-14]: SDA, [15-16]: SCL, [17-18]: GND, [19-20]: +3.3V, [21-22]: GND.
Note that the signals on this header are referenced to the Microcontroller VIO voltage (3.3V).
11. Button Press LEDs: These LEDs indicate which button has been pressed. Note that the MAXWIN
function is not enabled by default, so multiple buttons can be pressed simultaneously, and therefore
multiple LEDs may light up.
12. LDC2114: The LDC2114 Inductive Touch Inductance-to-Digital Converter for Consumer and Low-
Power Applications
13. LDC probing pads: These probing points use the level-shifted (1.8V referenced) signals of SDA, SCL,
OUT0, OUT1, OUT2, and OUT3
4
Sensing Solutions EVM GUI
The Sensing Solutions EVM GUI provides direct device register access, user-friendly configuration, and
data streaming.
4.1
System Requirements
The host machine is required for device configuration and data streaming. The following steps are
necessary to prepare the EVM for the GUI:
•
The GUI and EVM driver must be installed on a host computer.
•
The EVM must be connected to a full speed USB port (USB 1.0 or above).
The Sensing Solutions EVM GUI supports the following operating systems (both 32-bit and 64-bit):
•
Windows XP
•
Windows 7
•
Windows 8 and 8.1
•
Windows 10