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71M6515H
A Maxim Integrated Products Brand
Energy Meter IC
DATA SHEET
JULY 2011
Bits 13-8: These six bits ( SUM_CYCLES ) define the length of the accumulation interval τ per the formula:
τ =
SUM _ CYCLES ? 42
2520 . 6
Allowed values are 24 (400ms) through 60 (1000ms), unless the post-processor is disabled. Bit 8 is the LSB.
It is important to note that the length of the accumulation interval, as determined by SUM_CYCLES , is not an exact multiple
of 1000ms. For example, if SUM_CYCLES = 60, the resulting accumulation interval is:
τ =
60 ? 42
32768 Hz
=
2520
2520 . 62 Hz
= 999 . 75 ms
13
This means that accurate time measurements should be based on the RTC, not the accumulation interval.
Bit 14: This bit ( CKOUT_DISB ) disables the CKOUT pin when set. The CKOUT pin can be used for diagnostics. For EMC
compliance and power saving reasons, CKOUT_DISB should always be set.
Bit 15: This bit ( ADC_DIS ) disables the ADC when set, e.g. to save power. Of course, no metering or measuring can be
performed with the ADC disabled.
Bits 18-16: These three bits ( TMUX ) select the source for the TMUX diagnostic output pin. For EMC compliance and
power saving reasons, TMUX should be zero (default) if unused.
Bit 18
TMUX2
0
0
0
0
1
1
1
1
Bit 17
TMUX1
0
0
1
1
0
0
1
1
Bit 16
TMUX0
0
1
0
1
0
1
0
1
TMUX
0
1
2
3
4
5
6
7
Signal Selected for the TMUX Pin
GND
MUX_SYNC
RTM
RTC Output
CE_BUSY
XFER_BUSY
VX_OK (Comparator Output)
V3P3/2 =1.5V internal analog voltage
Page: 38 of 60
? 2005 ? 2011 Teridian Semiconductor Corporation
1.6
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