Rtc; Figure 18 Battery Holder For Coin Cells; Figure 19 Xmc4200 Power Domains And Real Time Clock - Infineon CPU-42A-V1 Manual

2.9

RTC

The XMC4200 CPU has two power domains, the Core Domain and the Hibernate Domain.
The Core Domain (VDDP pins) is connected to the VDD3.3 rail. An on-board LDO voltage regulator generates
VDD3.3 (3.3 V) out of VDD5 (5 V).
The Hibernate Domain is powered via the auxiliary supply pin VBAT, which is supplied by either a 3 V coin cell
(size 1216, 1220 or 1225) plugged into the battery holder or 3.3 V (VDD3.3) generated by the on-board voltage
regulator.
Figure 18 Battery Holder for Coin Cells
The Real Time Clock (RTC) is located in the hibernate domain. Even if the Core Domain is not powered the
Hibernate Domain will operate if VBAT is supplied. The RTC keeps running as long as the Hibernate Domain is
powered via the auxiliary supply VBAT.
IFX1763
LDO
Voltage Reg.
Figure 19 XMC4200 Power Domains and Real Time Clock
Board User's Manual
VDDP
VDD3.3
VBAT
+
Battery
CPU Board XMC4200 Actuator
XMC4200
Core Domain
Hibernate Domain
Internal OSC
21
CPU_42A-V1
Hardware Description
Battery
Holder
Battery.emf
12 MHz
CPU
RTC
32.768 kHz
External OSC
RTC.emf
Revision 1.0, 2013-02-19