LISA-U series - System Integration Manual
UBX-13001118 - R17
Advance information
System description
Page 114 of 190
start-up event), to avoid latch-up of circuits and allow a proper boot of the module. If the external signals
connected to the module cannot be tri-stated, 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, when external reset is forced low and during power-on
sequence.
SIM card holder
SW1
SW2
4
V_INT
51
GPIO5
R4
R3
OUT
IN
GND
LDO Regulator
SHDN
3V8
1V8
GPIO3
GPIO4
TxD1
EXTINT0
23
24
R1
VCC
GPIO2
21
LISA-U series
u-blox GNSS
1.8 V receiver
U1
J1
C1
R5
R7
3V8
Network Indicator
R6
GPS Supply Enable
GPS Data Ready
GPS RTC Sharing
SIM Detection
20
GPIO1
DL1
T1
D1
Function not supported by LISA-U200-00S version
R2
Figure 59: GPIO application circuit
Reference
Description
Part Number - Manufacturer
R1
47 k
Ω
Resistor 0402 5% 0.1 W
Various manufacturers
U1
Voltage Regulator for GNSS receiver
See GNSS Module Hardware Integration Manual
R2
4.7 k
Ω
Resistor 0402 5% 0.1 W
Various manufacturers
R3
1 k
Ω
Resistor 0402 5% 0.1 W
Various manufacturers
R4
470 k
Ω
Resistor 0402 5% 0.1 W
Various manufacturers
D1
ESD Transient Voltage Suppressor
USB0002RP or USB0002DP - AVX
J1
SIM Card Holder
CCM03-3013LFT R102 - C&K Components (or equivalent)
R5
10 k
Ω
Resistor 0402 5% 0.1 W
Various manufacturers
R6
47 k
Ω
Resistor 0402 5% 0.1 W
Various manufacturers
R7
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 49: Components for GPIO application circuit
The recommended application circuit for the module status indication function, provided by LISA-U2 series
module (except for LISA-U200-00S)
GPIO1
and
GPIO13
pins to indicate module status (power-off mode, i.e.
module switched off, versus idle, active or connected mode, i.e. module switched on), is described in Figure 60.