6. DCO Frequency vs. Temperature | Texas Instruments MSP430x1xx

Basic Clock Module Operation

Using an External Resistor (ROSC) for the DCO

The DCO temperature coefficient can be reduced by using an external resistor

ROSC tied to DVCC to source the current for the DC generator. Figure 4−6 shows the typical relationship of fDCO vs. temperature for both the internal and

external resistor options. Using an external ROSC reduces the DCO temperature coefficient to approximately 0.1%/C. See the device-specific data sheet for parameters.

ROSC also allows the DCO to operate at higher frequencies. For example, the internal resistor nominal value is approximately 300 kΩ, allowing the DCO to operate up to approximately 5 MHz. When using an external ROSC of approximately 100 kΩ the DCO can operate up to approximately 10 MHz. The user should take care to not exceed the maximum MCLK frequency specified in the datasheet, even though the DCO is capable of exceeding it.

Figure 4−6. DCO Frequency vs. Temperature

fDCO
25%
0
			External
			Internal
−25%
			Celsius
−50	0	50	100

4-8	Basic Clock Module

MSP430x1xx specifications

The Texas Instruments MSP430x1xx series is a family of ultra-low-power microcontrollers that are highly regarded in the embedded systems community for their versatility and performance. Designed for applications ranging from portable instrumentation to low-power industrial devices, the MSP430x1xx combines flexibility and efficiency with advanced features tailored for energy-sensitive applications.

One of the standout characteristics of the MSP430x1xx is its ultra-low-power operation. This series offers several low-power modes that can significantly extend battery life in portable devices. The microcontroller can be in active mode, low-power mode, or even in a deep sleep state, allowing developers to optimize power consumption based on the application's requirements. In fact, some configurations can operate at just a few microamps, making it ideal for battery-operated devices.

Another key feature is the 16-bit RISC architecture that provides powerful processing capabilities while maintaining a low power profile. The MSP430x1xx series supports a maximum clock speed of 16 MHz, allowing for efficient task execution while consuming minimal energy. This architecture ensures that programs run smoothly while the microcontroller remains energy efficient.

The MSP430x1xx is equipped with various integrated peripherals, including analog-to-digital converters (ADCs), timers, and communication interfaces like UART, SPI, and I2C. The inclusion of a powerful ADC enables the microcontroller to handle sensor readings with high accuracy, making it suitable for applications like environmental monitoring and medical devices. The integrated timers provide essential functionality for real-time applications, allowing for event-driven programming and precise timing control.

Memory options in the MSP430x1xx series are also robust, with configurations offering flash memory sizes from 1 KB to 64 KB. This flexibility allows developers to choose the optimal memory size for their specific applications, accommodating a wide range of requirements.

Additionally, the MSP430x1xx microcontrollers are designed with a wide operating voltage range, typically from 1.8V to 3.6V, making them compatible with various power sources and further enhancing their usability in diverse applications.

In summary, the Texas Instruments MSP430x1xx series of microcontrollers is an excellent choice for developers seeking low-power, high-performance solutions for embedded applications. With an efficient architecture, a rich set of peripherals, and flexible memory options, these microcontrollers are positioned to meet the growing demands of modern electronic designs, particularly in battery-powered and energy-sensitive applications.

Texas Instruments MSP430x1xx manual Using an External Resistor Rosc for the DCO

Models: MSP430x1xx

Using an External Resistor (ROSC) for the DCO

Figure 4−6. DCO Frequency vs. Temperature

MSP430x1xx specifications