4
dc1697af
DEMO MANUAL DC1697A
HARDWARE SETUP
Jumper VDD_SEL set to INTVCC with a resistor connected
from DC1697 GND to circuit ground.
Note: The DC590 provides isolation and level shifting, as
the I
2
C interface is operating at 5.9V to 6.7V below the
supply being monitored.
The 5k shunt resistor shown provides 15mA to INTVCC at
80V. The allowable range of resistance for a given input
range is given by the following formula:
V
S(MAX)
– 5.9V
35mA
≤
R
SHNT
≤
V
S(MIN)
– 6.7V
1mA
+
I
LOAD(MAX)
> 80V
5k
dc1697A F03
Figure 3. Powering DC1697A Using High-Side Shunt Regulator to Allow for Input Voltage Higher Than 80V
Jumper VDD_SEL Set to INTVCC With A Resistor Connected from DC1697 GND to Circuit Ground
