71M6543F Datasheet, PDF(28/157 Page) Maxim Integrated Products – Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation

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71M6543F Datasheet, PDF (28/157 Pages) Maxim Integrated Products – Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation

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71M6543F/H and 71M6543G/GH Data Sheet

The WPULSE and VPULSE pulse generator outputs are available on pins SEGDIO0/WPULSE and

SEGDIO1/VPULSE, respectively (pins 45 and 44). The pulses can also be output on OPT_TX pin 53

(see OPT_TXE[1:0], I/O RAM 0x2456[3:2] for details).

CK32

150

MUX_SYNC

ADC MUX Frame

MUX_DIV Conversions (MUX_DIV=4 is shown)

Settle

CE CODE

S0 S1 S2 S3 S4 S5

W_FIFO

RST

WPULSE

4*PLS_INTERVAL 4*PLS_INTERVAL 4*PLS_INTERVAL 4*PLS_INTERVAL 4*PLS_INTERVAL 4*PLS_INTERVAL

1. This example shows how the FIFO distributes 6 pulse generator updates over one MUX frame.

2. If WPULSE is low longer than (2*PLS_MAXWIDTH+1) updates, WPULSE will be raised until the next

low-going pulse begins.

3. Only the WPULSE circuit is shown. The VARPULSE circuit behaves identically.

4. All dimensions are in CK_FIR cycles (4.92MHz).

5. If PLS_INTERVAL=0, FIFO does not perform delay.

Figure 9. Pulse Generator FIFO Timing

2.3.7 CE Functional Overview

The ADC processes one sample per channel per multiplexer cycle. Figure 10 shows the timing of the

samples taken during one multiplexer cycle with MUX_DIV[3:0] = 7 (I/O RAM 0x2100[7:4]).

The number of samples processed during one accumulation cycle is controlled by the I/O RAM register

SUM_SAMPS[12:0] (0x2107[4:0] and 0x2108[7:0]). The integration time for each energy output is:

SUM_SAMPS[12:0] / 2184.53, where 2184.53 is the sample rate in Hz

For example, SUM_SAMPS[12:0] = 2184 establishes 2184 multiplexer cycles per accumulation cycle or

2184/2184.53 = 0.9998 seconds. After an accumulation cycle is completed, the XFER_BUSY interrupt

signals to the MPU that accumulated data are available. The slight difference between the nominal length

of the accumulation interval (1000 ms) and the actual length of 999.8 ms (0.025%) is accounted for in the

CE code and is of no practical consequence.

v1.2

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