1vv0300773a Rev. 0 - 24/01/08
The suggested circuit is:
GE863-PRO3
VRTC
3V
Lithium1μ F primary
battery ceramic
S-817A19A Seiko
1.2μΑ
10K Ω
1μ F ceramic
The quoted current intensity are without VBATT power supply for the module.
The
At ambient temperature 20°C, the BR2032 coin type (Panasonic 190 mAh) should be sufficient for
When the VBATT voltage is present, the VRTC voltage exceeds the
NOTE: the
5.4 General Design Rules
The principal guidelines for the Power Supply Design embrace three different design steps:
•the electrical design
•the thermal design
•the PCB layout
5.4.1Electrical design Guidelines
The electrical design of the power supply depends strongly from the power source where this power is drained. We will distinguish them into three categories:
•+5V input (typically PC internal regulator output)
•+12V input (typically automotive)
•Battery
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