SA2007P Datasheet, PDF (6/12 Pages) Sames – Programmable Single Phase Energy Metering IC with Tamper Detection

SA2007P
sames
DEVICE CONFIGURATION
SIGNAL FLOW DESCRIPTION
The following is an overview of the SA2007P's registers. For a
detailed description of each parameter please refer to
parameter description section.
Figure 6 shows the various registers in the SA2007P's power
to pulse rate block. The inputs to this block are two single bit
pulse density modulated signals, each having a pulse rate of
641454 pulses per second at rated conditions. The
parameters Kc1, Kc2, Ne, Cs, Kr, Cres, and Cled contain
values which are read from the external EEPROM during
power up.
The divider registers, Channel 1 Balance and Channel 2
Balance, are used for calibration and to balance the gain of
each channel. The Earth Leakage Compensation register is
used to compensate for any permissible earth leakage that
may cause the SA2007P to indicate a tamper condition at low
current. The Channel Select register selects the source
(channel 1 or channel 2) which will be used for the pulse output.
Register Rated Condition is used to program the rated
condition of the meter and feeds the registers LED-constant
and Counter Resolution with the applicable pulse rate. These
two registers are programmed to select the LED output rate
and the counter resolution (pulses per kWh) respectively. The
Counter Pulse Width register is used to program the pulse
width for the mechanical counter driver output MOP and MON.
Channel 1 Power
641454p/s
Channel 2 Power
641454p/s
Channel 1
Balance
÷Kc1
Channel 2
Balance
÷Kc2
Earth Leakage
Compensation
Ne
Channel Select (1, 2, auto) Cs
Rated Condition
÷Kr
Normally 1253p/s
Normally 6400p/kWh
Counter
Resolution
Cres
LED-Constant
Cled
Counter
Pulse width
CPW
MOP MON
LED
Figure 6: Signal flow block diagram
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PRELIMINARY