2
dc1812af
DEMO MANUAL DC1812A
Quick start proceDure
Demonstration circuit 1812A is easy to set up to evalu-
ate the performance of the LTC2943. Refer to Figure 2
for proper measurement equipment setup and follow the
procedure below.
1. Connect a Li-Ion battery across V_BAT and GND. Multiple
Li-ion batteries can also be used as long as the total
voltage does not exceed the operating voltage of the
device. The LTC2943 has a maximum operating voltage
of 20V, so for a 4.2V lithium ion battery the maximum
cell count would be 4 cells.
2. Connect a load across V_CHRG/LD and GND for battery
discharge measurement. Up to 500mA supplied from
the battery can be measured with the board default
100mΩ sense resistor. Use SENSE
+
and SENSE
–
test
points to read voltage across the sense resistor.
3. Connect a 2.7V to 5.5V battery charger supply across
V_CHRG/LD and GND for battery charge measurement.
Up to 500mA supplied to the battery can be measured
with the board default 100mΩ sense resistor. Use
SENSE
+
and SENSE
–
test points to read voltage across
the sense resistor.
4. Connect a DC590 to 14-pin connector J1 for evaluation
with QuikEval, or connect a host controller I
2
C bus to
the SDA, SCL and GND test turrets.
5. If a host I
2
C controller is used, then provide a bus pull-up
voltage to the +5V turret, else start QuikEval software
on PC.
6. Read and write to the LTC2943 through I
2
C.
7. Through I
2
C, configure the
AL/CC
pin. Set JP1 accord-
ingly.
8 If
AL/CC
is set for charge complete, use pushbutton
switch S1 to simulate a logic low from a controller to
indicate a fully charged battery.
Figure 2. DC1812A Basic Setup
