Integrator's Manual GR47/GR48

5. SYSTEM CONNECTOR INTERFACE

LZT 123 7589 R1A

In back-up mode, the back-up source must provide enough power for RTC

operation. Refer to the table for the amount of current required.

The following table shows voltage characteristics for both modes.

If the voltage drops below 1.0 V in back-up mode, the RTC will stop

working. The following diagram shows the RTC connections.

Figure 5.13 RTC connections

Parameter Min. Typ. Max. Units

Supply Voltage RTC (normal mode -

charging the capacitor)

1.6 1.8 2.0 V

Supply Voltage RTC (back-up mode -

Capacitor provides the current)

1.0 1.8 2.0 V

Current drawn 5.0 10.0 µA

Backup

supply

VRTC

GR47

DGND