Integration Manual

TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R04 Advance Information Design-in
Page 103 of 141
According to the V_INT supply output voltage ripple characteristic specified in the TOBY-L2 Data Sheet [1]:
 Additional filtering may be needed to properly supply an external LNA, depending on the characteristics of
the used LNA, adding a series ferrite bead and a bypass capacitor (e.g. the Murata BLM15HD182SN1 ferrite
bead and the Murata GRM1555C1H220J 22 pF capacitor) at the input of the external LNA supply line
u-blox GNSS
1.8 V receiver
TxD1
EXTINT0
V_BCKP V_BCKP
3
SDA2
SCL2
VCC
1V8
C1
R3
5
V_INT
R5
R4
TP
T2
T1
R1 R2
1V8 1V8
GNSS data ready
GNSS RTC sharing
GNSS supply enabled
TOBY-L2 series
(except TOBY-L2x0-00S)
22
GPIO2
SDA
SCL
GPIO3
GPIO4
55
54
24
25
Figure 58: Application circuit for connecting TOBY-L2 modules to u-blox 1.8 V GNSS receivers using V_INT as supply
Reference
Description
Part Number - Manufacturer
R1, R2
4.7 k Resistor 0402 5% 0.1 W
RC0402JR-074K7L - Yageo Phycomp
R3
47 k Resistor 0402 5% 0.1 W
RC0402JR-0747KL - Yageo Phycomp
R4
10 k Resistor 0402 5% 0.1 W
RC0402JR-0710KL - Yageo Phycomp
R5
100 k Resistor 0402 5% 0.1 W
RC0402JR-07100KL - Yageo Phycomp
T1
P-Channel MOSFET Low On-Resistance
IRLML6401 - International Rectifier or NTZS3151P - ON Semi
T2
NPN BJT Transistor
BC847 - Infineon
C1
100 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C104KA01 - Murata
Table 37: Components for connecting TOBY-L2 modules to u-blox 1.8 V GNSS receivers using V_INT as supply
For additional guidelines regarding the design of applications with u-blox 1.8 V GNSS receivers see the GNSS
Implementation Application Note [13] and the Hardware Integration Manual of the u-blox GNSS receivers.