2. Power
PNT-SG3FS GNSS Module Hardware User Guide
9
2.
Power
The PNT-SG3FS is supplied with 3 power pins: VCC (pin 8), VCC_IO (pin 7), and VBAT (pin 6).
VCC
VCC (pin 8) is the main supply. The VCC voltage range differs depending on the voltage of
VCC_IO, as shown in Table 1 below.
Table 1. VCC Voltage Characteristics Against VCC_IO
Symbol Parameter
VCC_IO
Min
Typ
Max
Unit
VCC
Digital supply voltage
1.8
1.755 1.8
4.2
V
VCC
Digital supply voltage
3.3
3.0
3.3
4.2
V
During startup or low power application, current can change suddenly. It is important that supply
IC can provide this current variability.
VBAT
VBAT (pin 6) is the supply for the low-power domain backup: backup RAM and RTC.
VBAT can be either connected to VCC, or it can be connected to a dedicated always-on power
supply. Supplying power to VBAT during low-power mode enables fast recovery of GNSS fix.
VBAT prevents current flow when VBAT is lower than VCC. This is important when VBAT is
supplied with a small battery, especially if the battery is not rechargeable.
The VBAT voltage range differs depending on the voltage of VCC_IO, as shown in Table 2 below.
Table 2. VBAT Voltage Characteristics Against VCC_IO
Symbol Parameter
VCC_IO
Min
Typ
Max
Unit
VBAT
Backup input supply
voltage
1.8
1.755 1.8
4.2
V
VBAT
Backup input supply
voltage
3.3
3.0
3.3
4.2
V
VCC_IO
The VCC_IO (pin 7) voltage range is shown in Table 3 below.
Table 3. VCC_IO Supported Voltage Range
Symbol
Parameter
Min
Typ
Max
Unit
VCC_IO
IO supply voltage
1.755
1.8
1.98
V
VCC_IO
IO supply voltage
3.0
3.3
3.6
V
