SLAA666A March 2015 – January 2020 MSP430F6720 , MSP430F6720A , MSP430F6721 , MSP430F6721A , MSP430F6723 , MSP430F6723A , MSP430F6724 , MSP430F6724A , MSP430F6725 , MSP430F6725A , MSP430F6726 , MSP430F6726A , MSP430F6730 , MSP430F6730A , MSP430F6731 , MSP430F6731A , MSP430F6733 , MSP430F6733A , MSP430F6734 , MSP430F6734A , MSP430F6735 , MSP430F6735A , MSP430F6736 , MSP430F6736A , MSP430F6745 , MSP430F67451 , MSP430F67451A , MSP430F6745A , MSP430F6746 , MSP430F67461 , MSP430F67461A , MSP430F6746A , MSP430F6747 , MSP430F67471 , MSP430F67471A , MSP430F6747A , MSP430F6748 , MSP430F67481 , MSP430F67481A , MSP430F6748A , MSP430F6749 , MSP430F67491 , MSP430F67491A , MSP430F6749A , MSP430F6765 , MSP430F67651 , MSP430F67651A , MSP430F6765A , MSP430F6766 , MSP430F67661 , MSP430F67661A , MSP430F6766A , MSP430F6767 , MSP430F67671 , MSP430F67671A , MSP430F6767A , MSP430F6768 , MSP430F67681 , MSP430F67681A , MSP430F6768A , MSP430F6769 , MSP430F67691 , MSP430F67691A , MSP430F6769A , MSP430F6775 , MSP430F67751 , MSP430F67751A , MSP430F6775A , MSP430F6776 , MSP430F67761 , MSP430F67761A , MSP430F6776A , MSP430F6777 , MSP430F67771 , MSP430F67771A , MSP430F6777A , MSP430F6778 , MSP430F67781 , MSP430F67781A , MSP430F6778A , MSP430F6779 , MSP430F67791 , MSP430F67791A , MSP430F6779A
6 Metrology Results
With the changes made onto the MSP430F67xxA, the metrology performance should still be comparable to the non-A MSP430F67xx devices. To show this, an EVM430-F6779 poly-phase EVM is tested with both a MSP430F67791 and a MSP430F67791A. For the tests, the software attached to the application report Implementation of a Three-Phase Electronic Watt-Hour Meter Using MSP430F677x(A) (SLAA577) is used to test the MSP430F67791. The same software was then modified to use the MSP430F67791A to test the metrology performance of the MSP430F67791A. The software used to test the MSP430F67791A is available with the TI Design TIDM-3PHMTR-TAMP-ESD.
Similarly, an EVM430-F6736 single-phase EVM is tested with both a MSP430F6736 and a MSP430F6736A. The MSP430F6736 was tested with the code that is available with the application report Implementation of a Single-Phase Electronic Watt-Hour Meter Using MSP430F6736(A) (SLAA517). This same code was then updated to correspond to the MSP430F6736 for performing metrology testing. This MSP430F6736A-based software is available with the TI Design TIDM-1PHMTR-ESD.
Table 6, Figure 3, and Figure 4 show the metrology results for the MSP430F67791 and MSP430F67791A. Table 7, Figure 5, and Figure 6 show the metrology results for the MSP430F6736 and MSP430F6736A. In both sets of results, the A version of the chips do not differ significantly from the non-A versions of the chips.
Table 6. Active Energy % Error for MSP430F67791 and MSP430F67791A
| Current
(Amps) |
MSP430F67791 | MSP430F67791A | ||||
|---|---|---|---|---|---|---|
| 0° | 60° | -60° | 0° | 60° | -60° | |
| 0.05 | -0.043 | -0.086 | -0.076 | -0.011 | -0.024 | -0.08 |
| 0.1 | -0.053 | -0.019 | -0.068 | -0.005 | 0.077 | -0.079 |
| 0.25 | -0.028 | -0.03 | -0.057 | -0.018 | 0.005 | -0.078 |
| 0.5 | -0.014 | -0.018 | -0.04 | -0.027 | -0.009 | -0.058 |
| 1 | -0.01 | -0.004 | -0.022 | -0.015 | 0 | -0.04 |
| 2 | -0.0206667 | -0.00166667 | -0.039 | -0.029 | 0.00166667 | -0.0543333 |
| 5 | -0.018 | -0.015 | -0.0123333 | -0.0216667 | -0.0113333 | -0.0296667 |
| 10 | -0.00733333 | -0.0233333 | 0.0143333 | -0.0126667 | -0.017 | -0.00833333 |
| 20 | -0.00833333 | -0.042 | 0.028 | -0.0106667 | -0.0273333 | 0.00666667 |
| 30 | -0.000333333 | -0.0646667 | 0.062 | -0.005 | -0.043 | 0.0393333 |
| 40 | -0.003 | -0.091 | 0.078 | -0.00233333 | -0.0606667 | 0.0563333 |
| 50 | -0.0143333 | -0.122 | 0.0983333 | -0.008 | -0.101333 | 0.0786667 |
| 60 | -0.009 | -0.135 | 0.111333 | -0.0106667 | -0.113333 | 0.0863333 |
| 70 | -0.0123333 | -0.148667 | 0.12 | -0.0113333 | -0.120667 | 0.0963333 |
| 80 | -0.011 | -0.15 | 0.130333 | -0.016 | -0.131667 | 0.097 |
| 90 | -0.014 | -0.158667 | 0.126333 | -0.018 | -0.136 | 0.098 |
| 100 | -0.027 | -0.179333 | 0.119333 | -0.0253333 | -0.144333 | 0.0933333 |
Figure 3. EVM430-F6779 Performance With MSP430F67791 
Figure 4. EVM430-F6779 Performance With MSP430F67791A Table 7. Active Energy % Error for MSP430F6736 and MSP430F6736A
| Current
(Amps) |
MSP430F6736 | MSP430F6736A | ||||
|---|---|---|---|---|---|---|
| 0° | 60° | -60° | 0° | 60° | -60° | |
| 0.05 | -0.045 | 0.058 | -0.07 | 0.058 | 0.006 | 0.006 |
| 0.1 | -0.019 | 0.083 | -0.07 | 0.006 | -0.019 | 0.006 |
| 0.25 | -0.019 | 0.0575 | -0.0575 | 0.006 | 0.032 | -0.019 |
| 0.5 | 0.006 | 0.083 | -0.045 | -0.0023 | 0.0233 | 0.0063 |
| 1 | 0.0147 | 0.0663 | -0.0617 | 0.0147 | 0.032 | -0.0023 |
| 2 | -0.007 | 0.058 | -0.07 | -0.007 | 0.0233 | -0.019 |
| 5 | 0.0043 | 0.022 | -0.019 | 0.008 | 0.011 | 0.017 |
| 10 | -0.007 | -0.024 | 0.003 | 0.014 | -0.0007 | 0.03 |
| 20 | -0.015 | -0.0533 | 0.0493 | 0.006 | -0.019 | 0.032 |
| 30 | 0.0003 | -0.079 | 0.0747 | 0.015 | -0.045 | 0.058 |
| 40 | -0.0067 | -0.096 | 0.07 | 0.019 | -0.0493 | 0.0787 |
| 50 | 0.011 | -0.106 | 0.1023 | 0.03 | -0.055 | 0.119 |
| 60 | 0.0006 | -0.099 | 0.1203 | 0.032 | -0.0643 | 0.123 |
| 70 | 0.0167 | -0.096 | 0.1187 | 0.0307 | -0.067 | 0.1307 |
| 80 | 0.0263 | -0.098 | 0.143 | 0.035 | -0.064 | 0.1407 |
| 90 | 0.0367 | -0.096 | 0.1563 | 0.043 | -0.062 | 0.1467 |
| 100 | 0.0387 | -0.0943 | 0.16 | 0.04 | -0.06 | 0.155 |
Figure 5. EVM430-F6736 Performance With MSP430F6736 
Figure 6. EVM430-F6736 Performance With MSP430F6736A