Ublox SARA-R5 Series System Integration Manual

SARA-R5 series - System integration manual
UBX-19041356 - R04 Design-in Page 91 of 118
C1-Public
u-blox GNSS
3.0 V receiver
R1
IN
OUT
LDO regulator
SHDN
R2
VMAIN3V0
U1
23
GPIO2
26
SDA
27
SCL
1V8
SDA_A
SDA_B
GND
U2
SCL_ASCL_B
VCCA
VCCB
I2C-bus bidirectional
voltage translator
4
V_INT
C1
C2 C3
R3
SDA2
SCL2
VCC
OE
GNSS supply enable
GND
SARA-R500S / SARA-R510S
TXD1
EXTINT
TIMEPULSE
GND
24
GPIO3
25
GPIO4
46
SDIO_CMD
GND
1V8
B1 A1
GND
U3
B3A3
VCCBVCCA
Unidirectional
voltage translator
C4
C5
3V0
DIR1
DIR2 OE
B2 A2
B4A4
DIR4
DIR3
GNSS data ready
GNSS time stamp
GNSS time pulse
Figure 68: Application circuit for connecting SARA-R500S/SARA-R510S modules to a u-blox 3.0 V GNSS receiver
Reference
Description
Part number - Manufacturer
R1, R2
4.7 kΩ resistor 0402 5% 0.1 W
Generic manufacturer
R3
47 kΩ resistor 0402 5% 0.1 W
Generic manufacturer
C2, C3, C4, C5
100 nF capacitor ceramic X5R 0402 10% 10V
GCM155R71C104KA55 - Murata
U1, C1
Voltage regulator for GNSS receiver and
related output bypass capacitor
See GNSS receiver hardware integration manual
U2
I2C-bus bidirectional voltage translator
TCA9406DCUR - Texas Instruments
U3
Generic unidirectional voltage translator
SN74AVC4T774
12
- Texas Instruments
Table 43: Components for connecting SARA-R500S/SARA-R510S modules to a u-blox 3.0 V GNSS receiver
☞ For additional guidelines regarding Cellular and GNSS RF coexistence, see section 2.4.4
☞ For additional guidelines regarding the design of applications with u-blox 3.0 V GNSS receivers,
refer to the SARA-R5 series positioning implementation application note [18] and to the hardware
integration manual of the u-blox GNSS receivers.
2.6.5.2 Guidelines for DDC (I2C) layout design
The DDC (I2C) serial interface requires the same consideration regarding electro-magnetic
interference as any other digital interface. Keep the traces short and avoid coupling with RF line or
sensitive analog inputs, since the signals can cause the radiation of some harmonics of the digital
data frequency.
2.7 Audio
☞ Audio is not supported by the “00” product version of SARA-R5 series modules.
12
Voltage translator providing partial power down feature, so the 3 V supply can be also ramped up before V_INT 1.8 V supply

Ublox SARA-R5 Series Specifications

General

Brand	Ublox
Model	SARA-R5 Series
Category	Control Unit
Language	English