SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26
Design-in
Page 106 of 217
C5
GND
C4
C2
SARA-G3 / SARA-U2
(except SARA-U201)
52
VCC
53
VCC
51
VCC
3V8
C1
+
C3
Figure 45: Suggested design for all SARA-G3 and SARA-U2 series modules except SARA-U201: VCC bypass capacitors are used to
reduce ripple / noise on VCC voltage profile and to avoid undershoot / overshoot on VCC voltage drops
C1
GND plane
VCC line
Capacitor with
SRF ~900 MHz
C5
C3 C2
FB1
Ferrite Bead
for GHz noise
C4
C5
GND
C4
C2
SARA-U201
52
VCC
53
VCC
51
VCC
3V8
C1
+
FB1
C3
Capacitor with
SRF ~1900 MHz
SARA-U201
Figure 46: Suggested design for SARA-U201 module, highly recommended when using an integrated antenna
Reference
Description
Part Number - Manufacturer
C1
330 µF Capacitor Tantalum D_SIZE 6.3 V 45 m
T520D337M006ATE045 - KEMET
C2
100 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C104KA01 - Murata
C3
10 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C103KA01 - Murata
C4
15 pF Capacitor Ceramic C0G 0402 5% 25 V
GRM1555C1E150JA01 - Murata
C5
56 pF Capacitor Ceramic C0G 0402 5% 25 V
GRM1555C1E560JA01 - Murata
FB1
Chip Ferrite Bead EMI Filter for GHz Band Noise
220
at 100 MHz, 260
at 1 GHz, 2000 mA
BLM18EG221SN1 - Murata
Table 28: Suggested components to reduce ripple / noise on VCC and to avoid undershoot/ overshoot on VCC voltage drops
The ESD sensitivity rating of the
VCC
supply pins is 1 kV (Human Body Model according to JESD22-A114).
A higher protection level can be required if the line is externally accessible on the application board, e.g. if
accessible battery connector is directly connected to
VCC
pins. A higher protection level can be achieved
by mounting an ESD protection (e.g. EPCOS CA05P4S14THSG varistor array) close to accessible points.
