Supply Voltage

SB200 can be supplied with up to 20V through the DC jack. The DC jack has positive center. Minimum supply voltage is 6.5V.

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, ATtiny861, and the DAC.