GNSS Module Series

L76&L76-L_Hardware_Design 23 / 59

PMU

VCC

10 µF 100 nF

Module

TVS

ESD5651N

33 pF

Figure 4: VCC Input Reference Circuit

3.2.2. V_BCKP

The V_BCKP pin supplies power for the RTC domain. If the module power supply fails, the V_BCKP pin

supplies power for the real-time clock (RTC) and RAM. Use of valid time and GNSS orbit data at startup,

allows GNSS hot (warm) start. If no backup power is connected, the modules perform a cold start at

power up.

If there is a constant power supply in your system, it can be used to provide a suitable voltage to power

V_BCKP.

V_BCKP can be directly powered by an external battery (rechargeable or non-rechargeable). It is

recommended to place a battery with the combination of a 4.7 μF, a 100 nF and a 33 pF capacitor near

the V_BCKP pin. The figure below illustrates the reference design for supplying power for the RTC

domain with a non-rechargeable battery.

RTC

Domain

V_BCKP

Non-

rechargeable

Backup Battery

4.7 μF

100 nF

Module

33 pF

Figure 5: RTC Powered by Non-rechargeable Battery

Quectel L76 Hardware Design

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