ADE7758ARW Analog Devices Inc, ADE7758ARW Datasheet - Page 43

• Manufacturer Part Number: ADE7758ARW
• Description: IC ENERGY METERING 24-SOIC
• Manufacturer: Analog Devices Inc

Specifications of ADE7758ARW

• Rohs Status: RoHS non-compliant
• Input Impedance: 380 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 2.4V
• Voltage - I/o Low: 0.8V
• Current - Supply: 8mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (0.300", 7.50mm Width)
• Meter Type: 3 Phase
• Lead Free Status / RoHS Status: Not Compliant

Gain Calibration Using Pulse Output
Gain calibration is used for meter-to-meter gain adjustment,
APCF or VARCF output rate calibration, and determining the
Wh/LSB, VARh/LSB, and VAh/LSB constant. The registers used
for watt gain calibration are APCFNUM (0x45), APCFDEN
(0x46), and xWG (0x2A to 0x2C). Equation 50 through
Equation 52 show how these registers affect the Wh/LSB
constant and the APCF pulses.
END
YES
WATT OFFSET
ALL PHASES
CAL?
SET UP PULSE
WATT OFFSET
@ I
OUTPUT FOR
CALIBRATE
A, B, OR C
NO
MIN
, PF = 1
YES
ALL PHASES
VAR OFFSET
CAL?
SET UP PULSE
@ I
OUTPUT FOR
VAR OFFSET
CALIBRATE
Figure 76. Calibration Using Pulse Output
INDUCTIVE
A, B, OR C
NO
MIN
YES
, PF = 0,
PHASE ERROR
Rev. D | Page 43 of 72
PHASES
CAL?
ALL
START
PHASE @ I
SET UP PULSE
OUTPUT FOR
CALIBRATE
INDUCTIVE
A, B, OR C
For calibrating VAR gain, the registers in Equation 50 through
Equation 52 should be replaced by VARCFNUM (0x47),
VARCFDEN (0x48), and xVARG (0x2D to 0x2F). For VAGAIN,
they should be replaced by VARCFNUM (0x47), VARCFDEN
(0x48), and xVAG (0x30 to 0x32).
Figure 77 shows the steps for gain calibration of watts, VA, or
VAR using the pulse outputs.
NO
PF = 0.5,
YES
TEST
GAIN CAL
PHASES
,
VAR?
ALL
@ I
SET UP FOR
CALIBRATE
INDUCTIVE
A, B, OR C
NO
VAR GAIN
TEST
PHASE
YES
, PF = 0,
CALIBRATE VRMS
CALIBRATE IRMS
VA AND WATT
GAIN CAL?
PHASES
OFFSET
OFFSET
ALL
HAVE SEPARATE PULSE OUTPUTS
PF = 1 BECAUSE THEY
CAN BE CALIBRATED
SIMULTANEOUSLY @
SET UP PULSE
WATT AND VA
GAIN @ I
OUTPUT FOR
WATT AND VA
CALIBRATE
A, B, OR C
NO
PF = 1
MUST BE DONE
BEFORE VA GAIN
CALIBRATION
TEST
ADE7758
,