Hardware+Design V1.07
Table Of Contents
- Revision History
- 1 Introduction
- 2 Package Information
- 3 Application Interface Specification
- 4 RF Specification
- 5 Reliability and Operating Characteristics
- 6 Guide for Production
- Appendix
Smart Machine Smart Decision
3.1.3 RTC Backup
The module uses RTC (Real Time Clock) to update and maintain inherent time and keeps system alive at
no power supply status. The RTC power supply of module can be provided by an external capacitor or a
battery (non-chargeable or rechargeable) through the VRTC. The following figures show various reference
circuits for RTC back up. The discharge current is less than 10uA. If this feature is used, please refer to the
AT commands “AT+CTZU” and “AT +CTZR”.
z External capacitor backup
Figure 12: RTC supply from capacitor
z Non-chargeable battery backup
Figure 13: RTC supply from non-chargeable battery
z Rechargeable battery backup
Figure 14: RTC supply from rechargeable battery
SIM5320_Hardware Design_V1.07 2012-09-21
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