71M6543F datasheet(29/157 Pages) MAXIM

Part #	71M6543F

Description	Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation

PDF	157 Pages

Scroll/Zoom	100%

Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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71M6543F/H and 71M6543G/GH Data Sheet

v1.2

Figure 10: Samples from Multiplexer Cycle (Frame)

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: Accumulation Interval

Figure 11 shows the accumulation interval resulting from SUM_SAMPS[12:0] = 1819 (I/O RAM 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.

MUX

STATE

CK32

(32768 Hz)

MUX_DIV = 7 Conversions

Settle

Multiplexer Frame (15 x 30.518 µs = 457.8 µs)

30.5 µs

61.04 µs

XFER_BUSY

Interrupt to MPU

20ms

833ms

71M6543F Datasheet(PDF) 29 Page - Maxim Integrated Products