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Data Sheet
ADE7854/ADE7858/ADE7868/ADE7878
Table 29. Values Written to the SAGLVL and ZXTOUT Registers May Not Be Immediately Used by ADE7854 , ADE7858 ,
ADE7868 , and ADE7878 [er005, Version = 4 and Version = 5 Silicons]
Background
Issue
Workaround
Related Issues
Usually, the SAGLVL and ZXTOUT registers initialize immediately after power-up or after a hardware/software reset. After
the run register is set to 1, the phase voltage sag detector (for SAGLVL), and the zero-crossing timeout circuit (for ZXTOUT)
use these values immediately.
After the SAGLVL register is initialized with a new value after power-up or a hardware or software reset, the new value
may be delayed and not available for immediate use by the phase voltage sag detector. However, it is used by the
detector after at least one phase voltage rises above 10% of the full-scale input at the phase voltage ADCs.
After the ZXTOUT register is initialized with a new value after power-up or a hardware or software reset, the new value
may be delayed and not available for immediate use by the zero-crossing timeout circuit. However, the circuit does use
the new value after at least one phase voltage rises above 10% of the full-scale input at the phase voltage ADCs.
Usually, at least one of the phase voltages is greater than 10% of full scale after power-up or after a hardware/software
reset. If this cannot be guaranteed, then the SAGLVL and ZXTOUT registers should be written eight consecutive times to
reduce the probability of not being considered immediately by the phase voltage sag detector and zero-crossing timeout
circuit below 0.2 ppm.
None.
SECTION 1. ADE7854 / ADE7858 / ADE7868 / ADE7878 FUNCTIONALITY ISSUES
Reference
Number
er001
er002
er003
er004
er005
Description
Offset rms registers cannot be set to negative values.
Values written to the CF1DEN, CF2DEN, CF2DEN, SAGLVL, and ZXTOUT registers may not be immediately
used by ADE7854 , ADE7858 , ADE7868 , and ADE7878 .
The read-only rms registers may show the wrong value.
To obtain best accuracy performance, internal setting must be changed.
Values written to the SAGLVL and ZXTOUT registers may not be immediately used by ADE7854 , ADE7858 ,
ADE7868 , and ADE7878 .
Status
Identified
Identified
Identified
Identified
Identified
This completes the Silicon Anomaly section.
Rev. H | Page 79 of 100
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