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3.4
JP3 V
Voltage Generation
DD
The V
for biasing MCU devices can be adjusted to a desired voltage level. To set the desired V
DD
select JP3 for the preset voltage level. R10 is an optional footprint for through-hole resistor. If V
other than the preset values is desired, install R10 to adjust V
calculate the desired V
, use the following equation.
DD
Where R1 = 825Ω/ R10 and R2 = 500Ω.
When there is no jumper inserted on JP3, V
voltage if you accidentally remove JP3 while power is connected. However, it is good practice to
remove power from J8 (power jack) before changing JP3, JP4, or any other jumpers.
Figure 5.
3.5
JP1 V
Target Voltage Detect Bypass
DE
When the M-Station baseboard is used for flash programming of a micro-board or target system, the
V
signal (pin 10 on the flash programming connector) is used to sense that power is applied on the
DE
micro-board or target system. V
and micro-board to ensure compatible voltage levels.
V
_SEL = [1+(R1/R2)]*1.25 + (50µA)*R2
DD
defaults to 2V to prevent V
DD
JP3 Multiple V
Generation
DD
is also used to power the interface circuit between the M-Station
DE
7
M-Station Baseboard
, and do not insert a jumper in JP3. To
DD
from rising to a high
DD
,
DD
DD
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