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3.3.2
Current Measurement Jumpers:
The four
“
BT4 Current Measurement Jumpers
”
across the top of the board must ALWAYS be installed regardless
of what power source is chosen. These four jumpers are on power pins of the BT4 SoC and are made available to
measure the current draw on various parts of the BT4 Radio IP as well as the Host MCU. Below is the list of these
jumpers, the voltage rail name and a brief description. A more detailed explanation of current measurement is
provided in Section 5.
Table 3.3.1 - BT4 SoC Voltage Rails
– Current Measurement Pins
3.3.3
LDO Jumpers:
When the board is powered by an external 5 volt power supply, 5
LDO’s generate the required on-board
voltage supplies. These 5
“LDO jumpers” (J12, 13, 29, 30, & 31) are all required to be installed if the board is
powered whether by an external 5V supply or through USB. (Population of these jumpers may be present in
Battery Power Mode but have no relevance). These jumpers are provided to measure current consumption or
provide a tap for an external power source for voltage margining. The relevant jumpers related to measuring
current consumption by the BT Radio IP Block is 1V_ADJ (J30) and 3V_ADJ (J31) as the other three
LDO’s
power additional devices on the board. Below is a description of what each voltage rail powers on the board.
Table 3.3.2 - LDO Power Jumpers