SA2005F Datasheet, PDF (5/10 Pages) Sames – Three Phase Bidirectional Power/Energy Metering IC with Instantaneous Pulse Output

SA2005F
sames
Voltage Sense Inputs (IVN1, IVN2, IVN3)
The current into the voltage sense inputs (virtual ground)
should be set to 14µA_RMS at rated voltage conditions. The
individual mains voltages are divided down to 14V_RMS per
phase. The resistors R8, R9 and R10 set the current for the
voltage sense inputs. The voltage sense inputs saturate at an
input current of ±25µA peak.
Pulse Programming Inputs (PGM0, PGM1)
The pulse programming inputs PGM1 and PGM0 define the
representation of energy measured by the device on FOUT.
The table below shows the difference between the various
modes.
Frequency
Mode PGM1 PGM0 at rated
conditions
0 00
64Hz
1 01
64Hz
2 10
64Hz
3 11
1160Hz
Forward
Pulse
Width
1.14ms
1.14ms
1.14ms
71µs
Reverse
Pulse
Width
3.4ms
1.14ms
1.14ms
71µs
Test Inputs (TCLK, TEST)
The TEST and TCLK inputs are manufacturers test pins and
must be connected to VSS in a metering application.
OUTPUT SIGNALS
Direction Indication (DIRO)
The SA2005F indicates the measured energy flow direction on
pin DIR. A logic 0 on pin DIR 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
(greater than 90 degrees). Positive energy flow, when voltage
sense and current sense input are in phase, is indicated on pin
DIR as a logic 1. The DIR pin may be used to drive a LED in
order to indicate reverse energy flow.
Frequency Output (FOUT)
The sum of the measured power, from the three phases
produce a pulse rate of 64Hz or 1160Hz (mode 3), at rated
conditions on FOUT. The format of the pulse output signal,
which provides power/energy and direction information is
shown in figure 4. Refer to Pulse Programming Inputs for pulse
widths.
The following equation may be used for calculating the output
frequency:
f = 11.16 x FOUTX x ((I_I1 x I_V1)+(I_I2 x I_V2)+(I_I3 x I_V3)) / 3 x I_R
Where:
FOUTX = Nominal rated frequency (64Hz/1160Hz)
I_I1, I_I2, I_I3 = Input currents for current sensor inputs (16µA at rated
line current)
I_V1, I_V2, I_V3 = Input currents for voltage sensor inputs (14µA at
rated line voltage)
I_R = Reference current (typically 50µA)
An integrated anti-creep function ensures that no pulses are
generated at zero line currents.
ELECTROSTATIC DISCHARGE (ESD) PROTECTION
The SA2005F integrated circuit's inputs/outputs are protected
against ESD.
POWER CONSUMPTION
The overall power consumption rating of the SA2005F
integrated circuit is less than 50 mW with a 5V supply.
MODE 0
FOUT
MODE1
FOUT
MODE2
FOUT
MODE3
FOUT
DIR
DR-01582
Note: Frequency of pulse rate in MODE 3 is 18 times higher than other modes
Figure 4: FOUT options
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