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Table 2-6. Test points on SB100
Test Point Name
TP1
TP2
TP3
Description
Test Point 1 is the junction between the two primary power MOSFET
devices, Q3 and Q4, and is provided for testability purposes only.
Test Point 2 is the Vref output signal. If enabled and calibrated, this
should have 1.100VDC present.
Test Point 3 is the BATT signal, after passing through a dual diode
device to allow enabling this signal from either a cell-side or a host-
side power source. It is provided for testability purposes only.
2.2 Using the simulator stages
This chapter describes how to calibrate and use the integrated voltage simulator, and
also how to use the current simulator.
2.2.1 Calibrating the Cell Simulator
Calibration of the Cell Simulator section is actually very easy due to the design of the
circuitry. Since each cell’s potentiometer can be independently adjusted without
affecting the others, calibration does not require a great deal of back-and-forth
adjustment to take place.
Due to component tolerances, the upper range of adjustment will typically exceed
what can be tolerated by the ATmega406, namely, 5.5V. Care should therefore be
taken not to exceed the ATmega406 voltage ratings during calibration and during
development.
For most users it will be helpful to have all four cell simulation potentiometers
adjusted to the same setting, with the ability to adjust each cell slightly upward if
desired before reaching the upper end of the adjustment. This procedure will
establish that setting.
1. Wire up the CONN2 terminal strip for simulation as indicated in Figure 2-3.
2. Install all five jumpers on JB3.
3. Adjust V-SIM1-4 (VR1-4) fully counter-clockwise to their minimum setting. The
potentiometers are 12-turn, and one can hear a low click when end settings are
reached and every full turn from thereafter.
4. Apply 24.0VDC to the designated V-SIM supply terminals (not to the I-SIM
terminals!). Do not exceed 24.5VDC to the board at any time! Ensure that you have
a ripple-free DC supply available. Some wall converters that are DC-rated do not
include a filter capacitor and only output pulsed DC, which is not acceptable for
use.
5. Adjust V-SIM Range Adjust (VR5) fully clockwise. This supplies the maximum
current into the simulation pots.
6. Measure across CELL1+/CELL1- terminals while adjusting V-SIM1 clockwise to
reach 5.25VDC.
7. Repeat step 6 for cells 2-4.
After calibration, the main power supply voltage can be reduced if so desired, as low
as the maximum cell stack voltage plus 2.0VDC. Before making this adjustment, VR5
should be reduced to match the maximum stack voltage. For example, if the
maximum cell voltage desired is 4.2VDC, and a four-cell stack is used, adjust VR5 to
produce 4 . 2 V ? 4 = 16 . 8 V across the stack (CELL4+ to CELL1-). The power supply
can then be reduced from 24V to 18.8V.
8
AVR454
2598C-AVR-06/06
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