SLAU857A May   2021  – July 2021 MSP430FR2476 , MSP430FR2512 , MSP430FR2522 , MSP430FR2532 , MSP430FR2533 , MSP430FR2632 , MSP430FR2633 , MSP430FR2672 , MSP430FR2673 , MSP430FR2675 , MSP430FR2676

 

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3.2 MCU Selection

Table 3-1 summarizes all of the MSP430 MCUs that support CapTIvate capacitive touch. According to the required CAP I/O pins and other peripherals, the appropriate MCU can be selected. The capacitive touch code occupies 3KB to 6KB depending on the configuration, and the maximum output current of the I/O port with a 3-V power supply is 5 mA.

Table 3-1 MSP430 CapTIvate MCU Selection
Part NumberGenerationCAP I/OsFRAM (KB)RAM (KB)ADCCommunicationPackage
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

The CapTIvate MCUs include two generations of devices. The first-generation product (Gen1) focuses on cost performance, while the second-generation product (Gen2) has more abundant peripherals and stronger CapTIvate module performance. Table 3-2 compares the two device generations.

Table 3-2 Comparison of Gen1 and Gen2
FeaturesGen1 DeviceGen2 DeviceGen2 Advantages
Electrode charging voltage VREG power supply: 1.5 VVREG power supply: 1.5 V

DVCC power supply: 2.7 V to 3.6 V

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 to 25°C) 19:1 to 36:1 28:1 to 42:1 Higher signal-to-noise ratio and lower temperature drift.