Hardware Description
2015 Microchip Technology Inc.
DS50002376A-page 25
3.7
DEMO MODE SETUP AND OPERATION
Demo mode uses an on-board current source to exercise and demonstrate the features
of the PAC1921 power monitor. The 100 mV constant-current source is provided using
a +5V USB as the supply. Parallel sense resistors are provided to convert the current
to a corresponding voltage for the PAC1921 to read at the SENSE+ and SENSE-
inputs. The evaluation board is assembled with jumpers J3 and J4 positioned for Demo
mode (see
). Current is controlled by the evaluation
board Demo Configuration section of the evaluation board GUI (see
Section 4.2.6 “EVB Demo Configuration Panel”
3.8
SYS MODE SETUP AND OPERATION
Sys mode uses external current sources to exercise and demonstrate the features of
the PAC1921 power monitor.
3.8.1
Jumper Positions
To use Sys mode, reposition jumpers J3 and J4 (see
) to disconnect the
on-board demonstration current sources.
3.8.2
Load Connection
A 5 milliohm (1% tolerance) sense resistor, connected between J1 and J2, is provided
on-board the PAC1921 evaluation board to measure system current.
Load connections to the system can be established, as shown in
.
. .
FIGURE 3-3:
Load Connection Location.
J11 GND
Connect to
System Ground
J2 V
SOURCE-
Connect to
System DC
Load or Supply
J1 V
Connect to
System DC
Load or Supply
