MCP6N16 Evaluation Board User’s Guide
DS50002365A-page 18
2015 Microchip Technology Inc.
2.4
DETAILED CIRCUIT DESCRIPTIONS
2.4.1
Power Supply
When in its default configuration, the evaluation board requires only one external power
supply, typically a +5.0V single supply voltage applied to pin 3 (or 4) of the 4-pin screw
terminal J2. The ground connection (GND) should be made to pin 1 of J2; see
The LEDs D1 and D2 will indicate that power is applied to the V
DUT
and VS+ supplies.
FIGURE 2-2:
Power Supply Circuit and Connections.
The power plane of the evaluation board is separated into two segments: one labeled
V
DUT
and one VS+. The V
DUT
supply line mainly powers the
MCP6N16
instrumentation
amplifier. It is also connected to be the supply rail for any attached bridge sensor (VB+,
VB-). The VS+ supply powers the precision voltage reference MCP1525, and the
Zero-Drift op-amp MCP6V11.
The evaluation board is also preconfigured to be operated from a +3.3V supply rail
when connected up to a PIC
®
microcontroller. Jumper 8 is needed to make this
connection, while any external lab supplies must be disconnected from the power
connector J2.
In addition to connecting the supply voltages, pin 2 of terminal J2 can be used to apply
an external common-mode voltage (V
CM
) for biasing the inputs of the instrumentation
amplifier
MCP6N16
(see
). Further details on this function can be found in
Section 2.4.3 “Instrumentation Amplifier”
.
Note 1:
Jumper J1 is installed by default and therefore shorts the V
DUT
and VS+
supply voltage connections together. In this configuration, the evaluation
board can be operated with full functionality within a voltage range of
+2.7V to +5.5V.
2:
Removing jumper J1 will necessitate a second external power supply to
maintain full operation of the evaluation board. This will allow the
MCP6N16 to be operated over its full supply range of +1.8V to +5.5V. The
VS+ supply should not be lower than +2.7V, in order to maintain operation
of the +2.5V precision reference IC MCP1525.
VCM
GND
0.1uF
C5
10uF
C2
GREEN
D1
GND
12
34
J2
10uF
C1
DA
C
2
1k
R5
+2.7V t
5.5V
+1.8V t
5.5V
12
J8
Switched
3.3VDD from
Motherboard
220R
FB1
1
2
Vcm
GND
VS+
VDUT
GREEN
D2
GND
1k
R31
1k
R3
+
o
o
+
Содержание MCP6N16
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