1
dc1697af
DEMO MANUAL DC1697A
DESCRIPTION
LTC2945
Wide Range I
2
C Power Monitor
Demonstration circuit 1697A features the LTC2945. The
LTC2945 is a rail-to-rail system monitor that measures
current, voltage, and power. It features an operating range
of 2.7V to 80V and includes a shunt regulator for supplies
above 80V to allow flexibility in the selection of input sup-
ply. The current common mode measurement range of
0V to 80V is independent of the input supply. An onboard
0.75% accurate 12-bit ADC measures load current, input
voltage and an auxiliary external voltage. A 24-bit power
value is generated by digitally multiplying the measured
12-bit load current and input voltage data. Minimum and
L
, LT, LTC, LTM, QuikEval, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
BOARD PHOTO
maximum values are stored and an overrange alert with
programmable thresholds minimizes the need for software
polling. Data is reported via a standard I
2
C interface. The
demo board is populated for a 5A application. This can
be changed by populating R1 accordingly.
Design files for this circuit board are available at
http://www.linear.com/demo
Figure 1. Proper Test Equipment Setup
4V TO 80V
TO DC590
LOAD
dc1697A F01
