71M6545 MAXIM [Maxim Integrated Products], 71M6545 Datasheet - Page 29

• Manufacturer Part Number: 71M6545
• Description: Four-Quadrant Metering, Phase Metrology Processors Flash/RAM Size
• Manufacturer: MAXIM [Maxim Integrated Products]

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 11
PDS_6545_009
0x2107[4:0] and 0x2108[7:0]), consisting of 1819 samples of 457.8 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 SUM_SAMPS[12:0]. 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.
v1.0
(32768 Hz)
STATE
CK32
MUX
S
shows the accumulation interval resulting from SUM_SAMPS[12:0] = 1819 (I/O RAM
61.04 µs
20ms
IA
0
Figure 10: Samples from Multiplexer Cycle (Frame)
61.04 µs
© 2008–2011 Teridian Semiconductor Corporation
VA
1
Figure 11: Accumulation Interval
IB
2
833ms
Multiplexer Frame (15 x 30.518 µs = 457.8 µs)
MUX_DIV
= 7 Conversions
VB
3
IC
4
61.04 µs
VC
5
Interrupt to MPU
Data Sheet 71M6545/H
XFER_BUSY
61.04 µs
ID
6
30.5 µs
Settle
S
29