71m6532f-igt Maxim Integrated Products, Inc., 71m6532f-igt Datasheet - Page 18
71m6532f-igt
Manufacturer Part Number
71m6532f-igt
Description
Energy Meter Ic
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.71M6532F-IGT.pdf
(120 pages)
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signals to the MPU that accumulated data are available.
The end of each multiplexer cycle is signaled to the MPU by the CE_BUSY interrupt. At the end of each
multiplexer cycle status information, such as sag data and the digitized input signal, is available to the MPU.
Figure 7
50, consisting of 2100 samples of 397 µs each, followed by the XFER_BUSY interrupt. The sampling in
this example is applied to a 50 Hz signal.
There is no correlation between the line signal frequency and the choice of PRE_SAMPS[1:0] or
SUM_CYCLES[5:0] (even though when SUM_CYCLES[5:0] = 42 one set of SUM_CYCLES[5:0] happens to
sample a period of 16.6 ms). Furthermore, sampling does not have to start when the line voltage crosses
the zero line and the length of the accumulation interval need not be an integer multiple of the signal cycles.
Data Sheet 71M6531D/F-71M6532D/F
For example, PRE_SAMPS[1:0] = 42 and SUM_CYCLES[5:0] = 50 will establish 2100 samples per accumulation
cycle. PRE_SAMPS[1:0] = 100 and SUM_CYCLES[5:0] = 21 will result in the exact same accumulation
cycle of 2100 samples or 833 ms. After an accumulation cycle is completed, the XFER_BUSY interrupt
18
shows the accumulation interval resulting from PRE_SAMPS[1:0] = 42 and SUM_CYCLES[5:0] =
20ms
© 2005-2010 TERIDIAN Semiconductor Corporation
Figure 6: Samples from Multiplexer Cycle
Figure 7: Accumulation Interval
IA
VA
833ms
IB
VB
13/32768Hz = 397µs
per mux cycle
1/32768Hz =
30.518µs
Interrupt to MPU
FDS 6531/6532 005
XFER_BUSY
v1.3
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