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Always keep the temperature of the FETs (Q404 and Q405) and the resistors (R444
and R445) below a reasonable temperature (very warm is ok, untouchable is bad).
The equations below can be used to determine the maximum currents for the load
resistors and FET transistors – still, keep well below these values.
Equation 3-1. Maximum current in the resistor in the electronic load.
I res, max =
2 W
100 m ?
= 4 . 47 A
Equation 3-2. Maximum current in the FET transistor in the electronic load.
I FET, max =
1 5W
V supply ? V res
3.4 Supply voltages and ground levels
The board operates with three supply voltages (V3P3, V6P0 and V3P3A) and two
grounds (PGND and GND).
The VP3P3 (3.5V) and VP6P0 (6.3V) are the supply voltage for the ATmega644 and
other miscellaneous parts of the design, such as the electronic load, that are used to
support the development of an application.
The V3P3A (3.3V) is an adjustable mixed analog and digital supply voltage for the
ATtiny devices – this is used for the core part of the battery-charger. The mega644
can adjust this voltage, if desired. The PWM from OC2B set the adjustment and the
output Q3 on the port expanded U202 enables the adjustment.
PGND is used as ground reference for all power electronics (buck converter,
electronic load and so on), while GND is used as ground reference for other noise
sensitive analog circuits and low-current part of the circuits such as the
microcontrollers. The PGND and GND are connected at two points, the R142 and the
R143, which are both 0 ohm resistors.
3.5 ADC reference
To achieve sufficiently high accuracy on the current measurements a 2.500V (0.1%)
external reference is used. The reference is a high-accuracy zener diode, buffered by
operational amplifiers.
If it is desired to use the AVR’s internal voltage reference rather than the external one
the external voltage reference can be disconnected by removing the resistor R141.
4 Connectors and jumpers
The connectors and jumpers on the BC100 are described in the sections below.
4.1 Power connector
The BC100 can be connected to a DC power supply (9V-40V) through either the 4mm
banana connectors, or through the power jack (negative center). Please refer to
6
AVR451
8088A-AVR-09/07
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