SA9607P
INPUT SIGNALS
VREF
The VREF pin is the reference for the bias resistor and is the
recommended point for analog calibration. With a bias resistor
of 24kΩ optimum conditions are set. Any changes to the bias
resistor will affect the output pulse rate quadratically (i.e.(R
= +5%,(f=10%).
Serial Data SDA
The SDA pin connects directly to the SDA pin of an external
EEPROM. The pin is used to transfer data between the
EEPROM to the SA9607P. An external pull up resistor in not
needed.
Serial Clock SCL
The SCL pin connects directly to the SCL of an external
EEPROM. The SCL output is used to strobe data at a rate of
50kHz out of the EEPROM. An external pull up resistor is not
needed.
Configuration CNF
A rising edge on the CNF pin, with DIRO high, will trigger a
register update from the external EEPROM. This feature may
be used during calibration to load updated register data in the
SA9607P. For normal operation of the SA9607P the CNF pin
should be connected to V
SS
.
VDD
L ED
VSS
D R -013 32
t
LED
t
LED
= 10ms (6400 or 3200 pulses per kWh)
t
LED
= 71µs (1252 pulses per second)
Figure 5: LED pulse output
Selected input indication (SEL1)
The SA9607P continuously compares the power consumptions
on both channel 1 and channel 2 inputs. The larger of the two
measurements are used for pulse output generation. The
SEL1 output pin indicates which channel is currently being
used for the pulse output.
Signal
Output
SEL1
Value Description
0
1
Current Channel 1 selected (IIN1 / IIP1)
Current Channel 2 selected (IIN2 / IIP2)
OUTPUT SIGNALS
Motor output (MOP, MON)
The motor pulse width is programmable for 71ms and 142ms.
The MON pulse will follow the MOP pulse within the selected
pulse width time. This prevents that the motor armature is in
the wrong position after a power failure. Both MOP and MON
outputs are active high. One energy pulse is represented by a
MOP pulse followed by a MON pulse. The motor drive wave
forms are shown in figure 4.
VDD
MOP
VSS
VDD
MON
VSS
D R -0 1 5 5 9
Earth loop tamper indication (ELT)
In case the power measurements from both current channels
differ by more than 12.5%, (indicating a earth loop tamper
condition), the ELT output is set to zero. The SA9607P
continues to generate output pulses from the larger of the two
measured powers in this condition. The ELT output is active
low.
Direction indication (DIRO)
The SA9607P provides information about the energy flow
direction on pin DIRO. A logic 1 on pin DIRO indicates reverse
energy flow. Reverse energy flow is defined as the condition
where the voltage sense input and a current sense input are
out of phase (greater than 90 degrees).
Positive energy flow, when voltage sense and current sense
input are in phase, is indicated on pin DIRO as a logic 0.
The DIRO pin may be used to drive a LED in order to indicate
reverse energy.
Signal
Output
DIRO
Value
1
0
Description
Reverse energy flow
Forward energy flow
t
m
t
m
t
m
t
m
= 71ms, 142ms
Figure 4: Motor drive on MON and MOP pins of device
LED output (LED)
Three options for the LED output pulse rate are available, 6400
and 3200 pulses per kWh, as well as a pulse rate of 1252
pulses per second at rated conditions. At 1252 pulses per
second t
LED
is 71µs, for the other options t
LED
is 10ms. The LED
output is active low as in figure 5.
5/12
SAMES [ SAMES ]
