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CapTIvate™ Touch Getting Started Manual
13
Copyright © 2021, Texas Instruments Incorporated
3.2
MCU selection
Table 3-1 summarizes all MSP430s that support capacitive touch. According to the required CAP I/O and
corresponding peripherals, the appropriate MSP430 can be selected. It should be noted that the capacitive touch
code needs to occupy
3-6k
bytes of space according to different configurations, and the maximum output current
of the I/O port under 3V power supply is only 5mA.
Table 3-
1 MSP430 CapTIvate™ series device selection
Part number
Generation
CAP
I/O
FRAM
(kB)
RAM
(KB)
ADC
Communication
Package Group
MSP430FR2512 Gen1
4
8
2
10 bit
1 UART; 1 I2C; 2 SPI
TSSOP|16, VQFN|20
MSP430FR2522 Gen1
8
8
2
10 bit
1 UART; 1 I2C; 2 SPI
TSSOP|16, VQFN|20
MSP430FR2532 Gen1
8
8
1
10 bit
2 UART; 1 I2C; 3 SPI
VQFN|24
MSP430FR2533 Gen1
16
16
2
10 bit
2 UART; 1 I2C; 3 SPI
TSSOP|32, VQFN|32
MSP430FR2632 Gen1
8
8
2
10 bit
2 UART; 1 I2C; 3 SPI
DSBGA|24, VQFN|24
MSP430FR2633 Gen1
16
16
4
10 bit
2 UART; 1 I2C; 3 SPI
DSBGA|24, TSSOP|32,
VQFN|32
MSP430FR2672 Gen2
16
8
2
12 bit
2 UART; 2 I2C; 4 SPI
VQFN|32
MSP430FR2673 Gen2
16
16
4
12 bit
2 UART; 2 I2C; 4 SPI
VQFN|32
MSP430FR2675 Gen2
16
32
6
12 bit
2 UART; 2 I2C; 4 SPI
LQFP|48, VQFN|32, VQFN|40
MSP430FR2676 Gen2
16
64
8
12 bit
2 UART; 2 I2C; 4 SPI
LQFP|48, VQFN|32, VQFN|40
What needs to be added is that the CapTIvate™ series of MSP430 is mainly divided into two series. The first
-
generation product Gen1 focuses on cost performance, while the second-generation product Gen2 has more
abundant peripherals and stronger Ca
pTIvate™ module performance. The specific differences are shown in Table
3-2.
Table 3-2 Comparison of Gen1 and Gen2
Features
Gen1 device
Gen2 device
Advantages
Electrode charging voltage
VREG power supply: 1.5V VREG power supply: 1.5V
DVCC power supply: 2.7-3.6V
Will affect the charging and
discharging voltage, the newly
added DVCC mode can improve
the signal-to-noise ratio and
anti-interference ability.
Input bias current
No
Yes
Improve anti-interference ability.
Conversion and anti-noise
processing
Software
Hardware
Improve response speed and
save code space.
Typical signal-to-noise ratio
(-40°C-25°C)
19:1
–
36:1
28:1
–
42:1
Higher signal-to-noise ratio and
lower temperature drift.
3.3
EVM development board selection and evaluation
In the previous evaluation of capacitive touch function, the software and hardware involved are shown in Table 3-
3. To set up the entire development chain, GUI, IDE, SDK, Programmer, MCU, and sensor board are required. Part
of the MCU board and sensor board are integrated.
Table 3-
3 CapTIvate™ Development Chain
GUI
IDE
SDK
Programmer
MCU board
Sensor board
Supported Sensor type
Self-mode
button/Wheel/slider/Proximity
Mutual-mode
button/Wheel/slider/Proximity
(FR2522)
12 mutual mode buttons and 1
proximity
(FR2512)
4 self-mode buttons
The software part of the development chain is:
•
GUI: Used to generate code and debug parameters online.
