4
dc1812af
DEMO MANUAL DC1812A
Quikeval interface
InFo CoLumn
Accumulated Charge Since Start (ACR Display)
The “Accumulated Charge Since Start” text box displays
the change in accumulated charge since the start of a scan.
The initial data in the ACR registers (registers C and D)
is first stored at the start of a scan and then any change
in charge is reported in the ACR text box. This data can
be displayed in one of two formats: coulombs and mAh.
Voltage and Current Display
Data from the voltage ADC (registers I and J) and the
current ADC (registers O and P) is displayed here in volts
and amperes, respectively. If the current falls into the mA
range then the interface automatically updates the units
accordingly. The display indicates the current as seen
from the battery. Hence, if a negative value is displayed,
the battery is discharging. If a positive value is displayed,
the battery is charging.
Temperature Display
Data from the temperature ADC (register U and V) is dis-
played here. It can be displayed in two formats: Celsius
and Kelvin.
Start Button
Click on start to begin a polling routine that is based on
the selected ADC mode. By default the ADC mode is set to
automatic mode which updates the interface every 60ms.
If the scan ADC mode is selected from the “Registers and
Control” tab, then the interface would update every 10s.
The ADC mode can be switched in real time during a scan
and the interface will respond accordingly.
The interface recognizes when it is scanning and replaces
the start button with a stop button during a polling routine.
Similarly, for a single update, select the manual mode
and click start. The LTC2943 will take a snapshot of the
charge, voltage, current and temperature after which it
will immediately go into sleep mode in which only the
charge accumulator is running. For convenience the GUI
will hold the values of the snapshot for 2 seconds before
updating the interface and displaying “ADC Off” in the
current, voltage and temperature text box.
