Maxim Integrated 71M6521BE Energy Meter IC Family Software - Manual (Page 44)

71M652X Software User’s Guide
Revision 1.7 TERIDIAN Proprietary 44 of 138
© Copyright 2005-2007 TERIDIAN Semiconductor Corporation
Feature
Feature Code
Size
8KB 16KB 32KB Description
Creep mode 0.37KB Y Y Y Adjustable at calibration.
If abs(W) < Creep threshold, then creep mode.
Zero accumulator
of CE N/A Y 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 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 N 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
8KB 16KB 32KB Description
Brownout mode 0.1KB Y 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 Y Is entered automatically when a sag event occurs.
Displays the Wh register, waits 7 sec using wakeup
timer, then initiates sleep mode.
Wake button 0.5KB Y Y Y When in sleep mode, enters LCD mode.
Wake timer 0.5KB Y 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 is represented by the sum of the
other code features.