Specifications

TC35 / TC37 Hardware Interface Description
TC35_37_HD_02_V03.10 - Released Page 39 of 92 21.12.2001
Baseband
processor
RTC
PSU
ZIF
+
VBATT+
VDDLP
+
Figure 13: RTC supply from non-chargeable battery
Note: In battery powered applications (Figure 12 and Figure 13), ensure that the voltage
supplied from the batteries is V
BATTERY
≤ V
BATT+
.
The V
DDLP
voltage should be kept below the minimum V
BATT+
. voltage. This is
significant to prevent the GSM engine from being powered over the RTC backup
battery. Please refer to chapter 3.9, Table 18 for more information.