Specifications

L70 Hardware Design
L70_HD_V1.0 - 19 -
Table 8: Pin definition of the V_BCKP pin
Note: The V_BCKP could not keep open. The V_BCKP pin should be connected to a battery or a
capacitor for GPS module warm/hot start and AGPS.
Please refer to the following figure for RTC backup:
RTC
LDO
MODULE
V_BCKP
Non-chargeable
battery or capacitor
Figure 6: RTC supply from non-chargeable battery or capacitor
The V_BCKP pin does not implement charging for rechargeable battery. It is necessary to add a
charging circuit for rechargeable battery, shown as the following figure:
Charge Circuit
VCC
RTC
LDO
1K
MODULE
V_BCKP
Chargeable
Backup Battery
Figure 7: Reference charging circuit for chargeable battery
 Coin-type Capacitor backup
Coin-type Rechargeable Capacitor such as XH414H-IV01E from Seiko can be used.
Name
Pin No.
Function
V_BCKP
6
Backup voltage supply
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