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71M6511/71M6511H Demo Board User’s Manual
The Demo Code will compensate for the increased gain, i.e. the energy and current readings do not have to
be scaled.
A top-level schematic of the board connected to a shunt resistor is shown in Figure 1-10.
L6
IA
J3
IA_IN
R110
R14
IA
TP21
IA
6511
HDR3
GND
GND
FERRITE
0
U1
750
HDR2
V3P3
C17
1000pF
L7
C18
1000pF
R24
10K
1
2
3
A1 AC1
C1 C2
AC2 A2
BAV99DW
6
5
4
C8
1000pF
V3P3
FERRITE
L4
IB
SHUNT1
J16
IB_IN
R111
R104
IB
TP22
IB
HDR3
GND
GND
FERRITE
0
U6
750
HDR2
C11
1000pF
C10
1000pF
R106
3.4
R107
3.4
1
2
3
A1
C1
AC2
AC1
C2
A2
6
5
4
C29
1000pF
L5
BAV99DW
V3P3
FERRITE
JP17
L3
FERRITE
VA
V3P3
V3P3J2
HDR2
JP16
HDR3
C15
1nF
GND
V3P3_JUMPER
L1
FERRITE
L2
TP4
LOAD
R18
R17
R16
R15
V3P3
V3P3
2M
274K
270K
700
FERRITE
R32
750
C9
1000pF
VA
HDR2
GND
V3P3J2
NEUTRAL
J9
1
NEUTRAL
V3P3_JUMPER
C32
C14
1nF
30nF
2200uF, 16V
8.06K
TL431
GND
R8
RV1
510V
D3
1N4736A
+ C1
+ C2
10uF
8
+ C4
33uF
C5
0.1uF
D10
UCLAMP3301D
LIVE
J4
1
LIVE
L8
FERRITE
R118
10, 2W
1
0.47uF, 1000Vdc
C6
R6
100, 2W
6.8V, 1W
D4
1N4148
R7
130
25.5K
R20
0
GND
JP2
HDR2
Figure 1-10: Current Shunt Top-Level Schematics (Shown for the 2-Layer Board)
1.8.7 ADJUSTING THE DEMO BOARD TO DIFFERENT VOLTAGE DIVIDERS
The 6511 Demo Board comes equipped with its own network of resistor dividers for voltage measurement
mounted on the PCB. The resistor values (for the 4-layer Demo Board) are 2.5477M ? (R15-R21, R26-R31
combined) and 750 ? (R32), resulting in a ratio of 1:3,393.933. This means that VMAX equals
176.78mV*3,393.933 = 600V. A large value for VMAX has been selected in order to have headroom for
overvoltages. This choice need not be of concern, since the ADC in the 71M6511 has enough resolution,
even when operating at 120Vrms or 240Vrms.
If a different set of voltage dividers or an external voltage transformer is to be used, scaling techniques
similar to those applied for the current transformer should be used.
In the following example we assume that the line voltage is not applied to the resistor divider for VA formed
by R15-R21, R26-R31, and R32, but to a voltage transformer with a ratio N of 20:1, followed by a simple
resistor divider. We also assume that we want to maintain the value for VMAX at 600V to provide headroom
for large voltage excursions.
Revision 5.4
? 2005-2007 TERIDIAN Semiconductor Corporation
Page: 29 of 115
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