1 Introduction

The MSP430F67xxA devices are the latest e-meter SoCs from Texas Instruments for 1-phase and 3-phase meters. These devices offer enhancements from the previous non-A MSP430F67xx e-meter SoCs while still maintaining all of the features of the non-A chips so that a non-A device can be replaced with the corresponding A version of that chip. As an example, this would allow a MSP430F6736-based design to be upgraded by swapping its MSP430F6736 with a MSP430F6736A. This can be done for all of the F67xxA chips, which are all mentioned below:

• MSP430F672xA and MSP430F673xA single-phase metering SoCs
• MSP430F676x1A low-cost poly-phase metering SoCs
• MSP430F677xA, MSP430F676xA, MSP430F674xA, MSP430F677x1A, MSP430F676x1A, and MSP430F674x1A high-accuracy poly-phase metering SoCs

Note that the "A" in the MSP430F67xxA devices is listed on a chip as a part of the part number and is independent of the letter listed as the silicon revision number. For example, a non-A device may be labeled on the chip as being "Rev A" but is still considered a non-A device. Similarly, a MSP430F67xxA device may say "Rev B" but is still a MSP430F67xxA chip. Care must be taken not to confuse the revision letter on the chip with being a part of the chip part number.

Also, when comparing the MSP430F67xx non-A devices to the MSP430F67xxA devices, the following changes were made onto the MSP430F67xxA:

• Errata AUXPMM1 and RTC8 have been fixed.
• An RTCLOCK feature has been added to the RTC.
• A modification was made to better address ESD robustness.