12 jumper j27 – step-down switcher disable, 13 jumper j26 led power source, Jumper j27 – step-down switcher disable – Kontron SMARC Evaluation Carrier User Manual
Page 34: Jumper j26 led power source
User’s Guide
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7.12 Jumper J27 – Step-Down Switcher Disable
J27 is used to enable or disable and bypass the step-down switcher in the Battery Charger subsystem. Refer to Figure 2
Input Power Path Block Diagram for an illustration.
For single level battery cells (3.6V nominal battery voltage), the switcher should be disabled. For two level and three
level cells, the switcher should be enabled.
Jumper
Position
Function
J27
Inserted
Disables step-down switcher in Battery Charger system.
Not inserted
Switcher enabled
7.13 Jumper J26 LED Power Source
The LED power source can be disconnected by removing jumper J26. This can be important when trying to minimize
power. The combined power consumption of all the LEDs, if they are all on, can be over 0.5W.
Jumper
Position
Function
J34
Inserted
LEDs are powered
Not inserted
LED power is cut off