Maxim Integrated 71M6534 Energy Meter IC Family Software - Manual (Page 50)

71M653X Software User’s Guide
Feature
Feature Code
Size
1
φ
3
φ Description
Creep mode 0.37KB Y Y Adjustable at calibration.
If V < Vthreshold and I < Ithreshold for all elements,
then creep.
Zero accumulator
of CE N/A Y Y The pulse accumulation register in the CE is cleared
to prevent spurious pulses from low current noise.
Current threshold N/A Y Y Adjustable at calibration.
Set If max(abs(IA2), abs(IB2)) < Current threshold
then creep mode.
Current is calculated from RMS if possible, or, if
below 0.1A, from VA / V, where VA is calculated as
sqrt(Wh^2 + VARh^2)
For all elements.
Voltage threshold 0.12KB Y Y Adjustable at calibration.
If max(abs(VA2), abs(VB2)) < Volt threshold
inhibit frequency measurement, (frequency of zero)
Inhibit use of zero crossing counts, (main edge count
is zero), iInhibit voltage phase measurement (if any)
This feature is needed only if frequency or mains
edge count is present.
Table 5-7: Creep Functions
Feature Code
Size
1
φ
3
φ Description
Brownout mode 0.1KB Y Y Used to enter sleep and LCD modes. Command line
interface is available (32KB) when resetting into this
mode. Command prompt in this mode to be “B>”.
LCD mode 0.5KB Y Y Is entered automatically when power fails. Displays
the Wh register, waits 7 sec using wakeup timer, then
initiates sleep mode.
Wake button 0.5KB Y Y When in sleep mode, enters LCD mode.
Wake timer 0.5KB Y Y Used to exit the LCD mode, and enter sleep mode.
Table 5-8: Operating Modes
Note: The sleep mode does not require any support by MPU code. The mission mode performs the other code
features.
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