u-blox SARA-G3 Series User Manual

SARA-G3 series - System Integration Manual
UBX-13000995 - R06 Objective Specification Design-in
Page 151 of 218
module. If the external signals connected to the wireless module cannot be tri-stated or set low,
insert a multi channel digital switch (e.g. Texas Instruments SN74CB3Q16244, TS5A3159, or
TS5A63157) between the two-circuit connections and set to high impedance during module power
down mode and during the module power-on sequence.
If the GPIO pins are not used, they can be left unconnected on the application board.
OUTIN
GND
LDO Regulator
SHDN
3V8 1V8
GPIO3
GPIO4
TxD1
EXTINT0
24
25
R1
VCC
GPIO2 23
SARA-G350
u-blox GNSS
1.8 V receiver
U1
C1
R2
R4
3V8
Network Indicator
R3
GNSS Supply Enable
GNSS Data Ready
GNSS RTC Sharing
16
GPIO1
DL1
T1
Figure 61: GPIO application circuit
Reference
Description
Part Number - Manufacturer
R1
47 kΩ Resistor 0402 5% 0.1 W
Various manufacturers
U1
Voltage Regulator for GNSS receiver
See GNSS module Hardware Integration Manual
R2
10 kΩ Resistor 0402 5% 0.1 W
Various manufacturers
R3
47 kΩ Resistor 0402 5% 0.1 W
Various manufacturers
R4
820 Ω Resistor 0402 5% 0.1 W
Various manufacturers
DL1
LED Red SMT 0603
LTST-C190KRKT - Lite-on Technology Corporation
T1
NPN BJT Transistor
BC847 - Infineon
Table 36: Components for GPIO application circuit
2.7.1.1 Guidelines for GPIO layout design
The general purpose input/output pins are generally not critical for layout.

u-blox SARA-G3 Series Specifications

General

Brand	u-blox
Model	SARA-G3 Series
Category	GSM/GPRS Modules
Language	English