User Manual
LARA-R2 series - System Integration Manual
UBX-16010573 - R02 Objective Specification Appendix
Page 138 of 148
Appendix
A Migration between SARA-U2 and LARA-R2
A.1 Overview
Migrating between u-blox SARA-U2 series 3G / 2G cellular modules and LARA-R2 series LTE Cat 1 / 2G cellular
modules is a straightforward procedure that allows customers to take maximum advantage of their hardware
and software investments.
The SARA cellular modules (26.0 x 16.0 mm, 96-pin LGA) have a different form factor than the LARA cellular
modules (26.0 x 24.0 mm, 100-pin LGA), but the footprint of SARA and LARA modules has been developed to
ensure layout compatibility as described in Figure 71, so that the modules can be alternatively mounted on the
same single common application board.
64 63 61 60 58 57 55 54
22
50
65 66 67 68 69 70
71 72 73 74 75 76
77 78
79 80
81 82
83 84
85 86 87 88 89 90
91 92 93 94 95 96
CTS
RTS
DCD
RI
V_INT
V_BCKP
GND
CODEC_CLK
RESET_N
GPIO1
PWR_ON
RXD
TXD
11
10
8
7
5
4
2
1
21
19
18
16
15
13
12
3
20
17
14
9
6
23 25 26 28 29 31 3224 27 30
43
44
46
47
49
52
53
33
35
36
38
39
41
42
51
48
45
40
37
34
5962 56
GND
GND
DSR
DTR
GND
VUSB_DET
GND
USB_D–
USB_D+
RSVD
GND
GPIO2
GPIO3
SDA
SCL
GPIO4
GND
GND
GND
GND
VCC
VCC
RSVD
I2S_TXD
I2S_CLK
SIM_CLK
SIM_IO
VSIM
SIM_DET
VCC
SIM_RST
I2S_RXD
I2S_WA
GND
GND
GND
GND
GND
GND
GND
GND
GND
ANT_DET
ANT
SARA-U2
Top View
Pin 65-96: GND
GND
RSVD
RSVD
RSVD
RSVD
RSVD
RSVD
64 63 61 60 58 57 55 54
22
50
65 66 67 68 69 70
71 72 73 74 75 76
77 78
79 80
81 82
83 84
85 86 87 88 89 90
91 92 93 94 95 96
CTS
RTS
DCD
RI
V_INT
V_BCKP
GND
GPIO6
RESET_N
GPIO1
PWR_ON
RXD
TXD
11
10
8
7
5
4
2
1
21
19
18
16
15
13
12
3
20
17
14
9
6
23 25 26 28 29 31 3224 27 30
43
44
46
47
49
52
53
33
35
36
38
39
41
42
51
48
45
40
37
34
5962 56
GND
GND
DSR
DTR
GND
VUSB_DET
GND
USB_D–
USB_D+
RSVD
GND
GPIO2
GPIO3
SDA
SCL
GPIO4
GND
GND
GND
GND
VCC
VCC
RSVD
I2S_TXD
I2S_CLK
SIM_CLK
SIM_IO
VSIM
GPIO5
VCC
SIM_RST
I2S_RXD
I2S_WA
GND
GND
GND
GND
GND
GND
GND
GND
ANT_DET
ANT2
ANT1
LARA-R2
Top View
Pin 65-96: GND
99 100
97 98
RSVD
RSVD
HSIC_STRB
HSIC_DATA
HOST_SELECT
SDIO_D2
SDIO_CMD
SDIO_D0
SDIO_D1
SDIO_D3
SDIO_CLK
Figure 71: SARA-U2 and LARA-R2 series modules pin layout and pin assignment
SARA-U2 and LARA-R2 series modules are basically pin-to-pin compatible, given that LARA-R2 series modules
provide further additional functions and interfaces, as shown in Figure 71:
Secondary antenna
SDIO interface
HSIC interface
HOST_SELECT function