TD 91684GB
16 April 2015 / Ver. G
Installation Guide
T942C and T942C/2 Central Unit
17
1.4.13 Activation of Power Changeover Circuit
Activate the RAM back-up battery by closi
ng jumper S03 on the circuit board.
Figure 22. The RAM back-up battery.
NOTE: The power changeover circuit contains a 3V lithium
battery. At any interruption in the
ordinary +5V supply, both the RAM and real-time clock will be supplied by the battery
so that they retain their data.
Data
Current consumption, RAM and real-time clock:
• 3 V battery: typical 2 µA, max 40 µA
Battery life (battery connected):
• 5 V not connected: typical 7 years, min. 0.5 years
• 5 V connected: minimum 10 years
Battery life (battery not connected):
• min. 10 years
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