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5 Insertion of battery cells and placement of the corresponding jumper
Insert only the number of battery cells that are intended to be used with the SB20x in
the SB20x daughter board socket. Further, make sure to place the jumper that selects
the number of cells correct – otherwise one of the battery cells will be shorted.
Recommended order
Step
1
2
3
4
5
6
7
8
Action
Power Off SB200
Insert SB201-?
Start PC SW
Power On SB200
# of Cells LED should light up
Place Red Jumper correct
Insert battery / batteries
Press HWB button
Remark
Remove Batteries !
Check that correct SB201 is shown in status bar
Only one jumper
One minute charge is started
6 Supply voltage
SB200 can be supplied with up to 20V through the DC jack. The DC jack has positive
center. Minimum supply voltage is 7V.
The supply voltage need not be 20V, but needs to be a few volts higher than the
maximum voltage of the battery stack on the board. The Charger and the opamp’s in
the Constant Current Load need that to function properly.
If a two cell smart battery application is being developed it is therefore sufficient to
connect e.g. 10V. A higher voltage will only generate unnecessary heat in the board
supply regulator, which is used to generate 5V for the USB1287, tiny861 and the
DAC.
7 Charger
The Charger on the SB200 can deliver 0-20 volts and 0-2 ampere, using a constant
current, constant voltage charging scheme. It is configured by setting maximum
voltage, maximum current and timeout. The Charger will make sure that no limit is
exceeded and will try to make sure one of them is reached.
7.1 How it works
A fast PWM output on the Charger is connected via a buck converter to the battery.
By changing the duty cycle on the PWM, the voltage to the battery can be adjusted.
To be able to measure voltage and current, two ADC pins is connected on both sides
of a shunt resistor just before the battery.
The Charger continuously measures the voltage and current and adjusts the PWM
output accordingly. The PWM is adjusted one step at a time and this will make it take
approximately seven tenths of a second to go from minimum to maximum output. If
either maximum current, maximum voltage or timeout is set to zero, charging will stop
immediately.
4
AVR459
8132A-AVR-10/08
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