Quectel M10 Hardware Description

M10 Hardware Design
3.7 RTC backup
The RTC (Real Time Clock) power supply of module can be provided by an external capacitor or
battery (rechargeable or non-chargeable) through the VRTC on the SMT pad. There is a 3.9 K
resistor has been integrated in the module used for limiting current. You need only a coin-cell
battery or a super-cap to VRTC to backup power supply for RTC.
Note: The VRTC couldn’t be designed to a NC pin in your circuit. You should connect the
VRTC pin to a battery or a capacitor.
The following figures show various sample circuits for RTC backup.
RTC
Core
3.9K
MODULE
VRTC
Non-chargeable
Backup Battery

Figure 13: RTC supply from non-chargeable battery
RTC
Core
3.9K
MODULE
VRTC
Rechargeable
Backup Battery
Figure 14: RTC supply from rechargeable battery
M10_HD_V1.00 - 32 -
Quectel

Quectel M10 Specifications

General

Brand	Quectel
Model	M10
Category	GSM/GPRS Modules
Language	English