Migrating From MSP430F541x and MSP430F543x MCUs to MSP430F541xA and MSP430F543xA MCUs

This application report helps you migrate an application based on an MSP430F541x or MSP430F543x microcontroller (MCU) to an MSP430F541xA or MSP430F543xA MCU. This application report describes the main differences between the two device families and provides migration solutions for both software and hardware.

Trademarks

MSP430 is a registered trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

1 Device Comparison

The A revisions of the MSP430F541x and MSP430F543x microcontrollers (MCUs) offer better performance, lower power, and the full set of features for the MSP430F5xx MCUs. This enables a more robust and cost-optimized system design. Table 1 shows a general high-level comparison of the MCUs to provide an overview of reasons to consider migrating.

NOTE

In this migration guide, the term F543x is indicates the MSP430F541x and MSP430F543x MCUs (also known as the "non-A" versions), and the term F543xA indicates the MSP430F541xA and MSP430F543xA MCUs (also knowns as the "A" versions).

Table 1. High-Level Differences Between F543x and F543xA MCUs

	MSP430F541x and MSP430F543x	MSP430F541xA and MSP430F543xA
Maximum CPU clock speed	18 MHz	25 MHz
V_CC operating range	2.2 V to 3.6 V	1.8 V to 3.6 V
Standby current consumption (LPM3)	2.7 µA	1.9 µA⁽¹⁾
Minimum voltage for flash ISP	2.2 V	1.8 V
Bootstrap loader	Non-customizable	Customizable peripheral interface
Reliable operating temperature range⁽²⁾	-20°C to 85°C	-40°C to 85°C
ADC12 voltage reference	Internal 1.5-V or 2.5-V reference	General-purpose REF module (1.5-V, 2.0-V, or 2.5-V reference)
LPM4.5 exit	LPM4.5 not supported	Exit LPM4.5 using RST and/or port interrupts

(1) The value shown here is the expected current consumption and has not been characterized.

(2) See erratum PMM6 in the device-specific erratasheet.

2 Hardware Considerations

Fortunately, the F543xA versions of silicon have very few differences from the F543x versions that affect an application's hardware design. The package and pinout of the A versions is pin-to-pin compatible with the F543x versions.