SA2002D Datasheet, PDF (6/10 Pages) Sames – Single Phase Kilowatt-hour Metering IC for Mechanical Display Applications

SA2002D
sames
Direction input (DIRI)
The DIRI input pin allows the representation of the measured
energy to be selected. The representation can be of any three
types:
Positive Energy
Pulses are generated on the output if the energy flow is
positive. Any negative energy (reverse energy) flow is
disregarded.
Negative Energy
Pulses are generated on the output if the energy flow is
negative. Any positive energy flow is disregarded. Negative
energy flow is defined as the condition where the voltage
sense input and current sense input are out of phase (greater
than 90 degrees).
Bi-direct
Pulses are generated on the output if the energy flow is
positive or negative. The energy direction may be ascertained
by monitoring the DIRO pin.
Energy Direction Selection
DIRI
1
0
DIRO
Direction
Positive
Negative
Bi-direct
Fast Calibration (FAST)
The SA2002D may be put in a fast calibration mode by setting
FAST to V_DD. In this mode the pulse rate is 1252Hz on the LED
output at rated conditions.
OUTPUT SIGNALS
Motor Pulse Output (MOP, MON)
These outputs can be used to drive an electromechanical
counter directly at 100 (200) impulses per kWh. See table 1.
MOP
VDD
VSS
VDD
MON
VSS
DR-01559
t_m = 230ms
t_m
t_m
t_m
Figure 5: Motor output MON and MOP
LED Output (LED)
The LED pulse output follows the average power consumption
measured and is intended for calibration purposes. The pulse
rate is dependant on the settings of pins R0, R1 and R2 (see
rated conditions select). The LED output is active low. The LED
waveform is shown below:
LED
VDD
VSS
DR-01332
T_LED = 10ms
t_LED
Figure 6: LED pulse output
An integrated anti-creep function prevents any output pulses if
the measured power is less than 0.02% of the meters rated
current.
Direction Indication (DIRO)
The SA2002D provides information about the energy flow
direction on pin DIRO. A logic 0 on pin DIRO indicates reverse
energy flow. Reverse energy flow is defined as the condition
where the voltage sense input and current sense input are out
of phase (90..270 degrees).
Positive energy flow, when voltage sense and current sense
input are in phase, is indicated on pin DIRO as a logic 1.
The DIRO pin may be used to drive a LED in order to indicate
reverse energy.
http://www.sames.co.za
6/10