The Texas Instruments MSP430F5309IRGZR is a 16-bit MSP430 CPUXV2 microcontroller in the MSP430F5xx series, clocked at 25 MHz. It carries 24 KB of Flash program memory and 6 KB of RAM, with 31 general-purpose I/O lines. The peripheral set includes I²C, SPI, UART, LINbus, and IrDA interfaces, plus an 8-channel 10-bit ADC, brown-out detect, DMA, POR, PWM, and a watchdog timer. Supply range is 1.8 V to 3.6 V, and the operating temperature covers -40°C to 85°C — the industrial grade that suits factory-floor controllers, outdoor telecom nodes, and automotive body-electronics modules.
25 MHz core — timing budget for control loops
At 25 MHz, the CPUXV2 pipeline handles sensor fusion loops at a few kilohertz or bit-banged protocols. The 6 KB RAM holds data buffers for UART or SPI streams without external memory.
Industrial temperature grade and package
The -40°C to 85°C range qualifies the MSP430F5309IRGZR for environments where the PCB sees thermal cycling — motor drives, outdoor base stations, and under-hood automotive modules. The 48-VQFN package with exposed pad (7x7 mm) requires a thermal via pattern under the pad for adequate heat sinking when the MCU is running continuous ADC conversions or PWM outputs near the maximum supply voltage.
Connectivity and peripherals
The I²C, SPI, and UART interfaces can operate simultaneously — the USCI modules are independent, so you can talk to an I²C sensor while the SPI bus handles a display and a UART carries debug output. LINbus support makes this part a natural fit for automotive sub-networks like door modules or seat controls. The 8-channel 10-bit ADC samples at rates sufficient for battery monitoring or analog sensor inputs.