User manual

Capacitive Touch BoosterPack Hardware

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3 Capacitive Touch BoosterPack Hardware

As shown in Figure 6 and Table 1, the Capacitive Touch BoosterPack is a typical capacitive touch

application example for the new MSP430G2xx2 touch-sense enabled I/O pins. The board shows three

different capacitive sensor types: a single button in the middle, a wheel made of four single capacitive

sensors, and a proximity sensor around the edge of the PCB. In addition, there are nine LEDs on the

board to give instant feedback to user interaction. The eight LEDs around the wheel are multiplexed to

increase their number without using too many of the microcontrollers I/O pins. By using a time-shared

signal, only five I/O pins are used to drive all eight LEDs.

Figure 6. Capacitive Sense BoosterPack Hardware

Table 1. BoosterPack Interface

Pin MSP430 Port BoosterPack Signal Description

1 VCC NC Supply voltage, not connected to BoosterPack

2 P1.0 LED9 The white center LED

Backchannel UART transmit data output, not connected to

3 P1.1/TXD NC

BoosterPack

4 P1.2/RXD NC Backchannel UART receive data input, not connected to BoosterPack

5 P1.3 LEDx LED base to drive the eight multiplexed LEDs

6 P1.4 LED1 LED1 positive and LED5 negative drive

7 P1.5 LED2 LED2 positive and LED6 negative drive

8 P2.0 SENS0 Touch-sense proximity sensor

9 P2.1 SENS1 Touch-sense wheel sensor left

10 P2.2 SENS2 Touch-sense wheel sensor down

11 P2.3 SENS3 Touch-sense wheel sensor right

12 P2.4 SENS4 Touch-sense wheel sensor up

13 P2.5 SENS5 Touch-sense center button sensor

14 P1.6 LED3 LED3 positive and LED7 negative drive

15 P1.7 LED4 LED4 positive and LED8 negative drive

16 RST/SBWTDIO NC Reset line for SBW JTAG data, not connected to BoosterPack

17 TEST/SBWTCK NC Test line for SBW JTAG clock, not connected to BoosterPack

18 P2.6/XOUT NC Oscillator output, not connected to BoosterPack

19 P2.7/XIN NC Oscillator input, not connected to BoosterPack

20 GND GND Supply ground

430BOOST-SENSE1 - Capacitive Touch BoosterPack for the LaunchPad SLAU337A– April 2011– Revised September 2011

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