12048321 Rev. 01 (Draft)
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4.31. RTC-Battery Internal Connector
Reference Designator:
– J54
1.25mm Pitch Molex PicoBlade wire-to-board header, SMT, straight, 2 circuits
Description
J54 is external RTC-Battery connection terminal with double protection against overcurrent and reversed polarity by
diode and resistor in serial. The external RTC-Battery can be connected parallel to the on board CR2023 coin cell
(J55).
Connector drawing and contact-numbering scheme
Figure 40 Connector
– J54
Pinout
J54
Pin
Signal / Function
Pin Type
Signal Description
1
V_3V0_BATCONN
Power
Coin cell positive (+) pole
2
GND
GND
Coin cell negative (-) pole
4.32. RTC-Battery CR2023 Socket
Reference Designator:
– J55
Description
The J55 is a RTC-Battery CR2023 socket. The RTC-Battery is protected against overcurrent and reversed polarity
by diode and resistor in serial. The external RTC-Battery can be connected parallel to the on board CR2023 coin cell
(J54).
Connector drawing and contact-numbering scheme
Figure 41 Connector
– J55
