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Hardware Description
Figure 2-5. Flash evaluation board plugged to AT8xC5122D evaluation board
(AT89STK03)
2.2
Power supply
The Flash Evaluation Board power is supplied by the CPU board. The power supply must be set
to 3.3V for the AT89C5131A Evaluation board and 3.6V for the AT8xC5122D Evaluation board.
The figure 2.5 shows the different possible configurations of the AT89C5130/31A Evaluation
board (AT89STK05) and the figure 2.6 shows how to select 3.6V on the AT8xC5122D
Evaluation board in the 3.6V power supply configuration :
Figure 2-6. Power supply (3.3V) - AT89C5131A Evaluation Board (AT89STK05)
Power
Source
Regulation
Direct Input
VBUS
PWR.S.
LIM
REG
VBUS and
Current Limiter
PWR.S.
LIM
REG
External
PWR.S.
LIM
REG
VCC
5V
VCC
5V
VCC
5V
PWR
PWR.S.
LIM
3.3V
PWR
PWR.S.
LIM
3.3V
PWR
PWR.S.
LIM
3.3V
3.3V Regulate
REG
REG
REG
VCC
5V
VCC
5V
VCC
5V
AT89STK-10 Starter Kit Hardware User Guide
PWR
3.3V
PWR
3.3V
PWR
3.3V
2-5
7534A–USB–07/05
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