User Manual
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iption  UM1765
The board also includes: 
–  a high frequency 16 MHz crystal 
–  a low frequency 32 kHz crystal for lowest power consumption 
– a BALF-NRG-01D3 balun & harmonic filter 
–  an EEPROM M95640-RMN6P to store the board parameters 
Not mounted: 
–  a JTAG connector to program the BlueNRG processor 
–  an SMA connector for the external antenna 
2.1.1 Current measurements 
To monitor the power consumption of entire BlueNRG X-NUCLEO-IDB04A1 board, jumper 
U5 can be used, inserting an ammeter probe between pins 1 and 2 of the connector. Since 
the power consumption of BlueNRG during most of its operating time is very low, an 
accurate instrument in the range of few uA  may be required. 
6/15 DocID026346 Rev 4 










