LEXI-R422 - System integration manual
UBX-23007449 - R02
Appendix
Page 102 of 108
C1-Public
Appendix
A
Migration from SARA-R42 series modules
SARA-R42 series modules (26 x 16 mm, 96-pin LGA), consisting of the SARA-R422, SARA-R422S,
SARA-R422M8S and SARA-R422M10S modules, and LEXI-R422 modules (16 x 16 mm, 133-pin LGA)
have a different form-factor, but they integrate the same key internal components, offering the same
electrical characteristics and allowing the use of the same external circuits.
Therefore, migrating from SARA-R42 series to LEXI-R422 modules is a straightforward procedure
that allows integrators to take maximum advantage of their hardware and software investments.
Due to the different form-factor of the modules, the various interfaces and functions are in different
layout positions on the LGA pads of the modules.
The pin assignment comparison SARA-R42 series to LEXI-R422 modules, with remarks for migration,
is illustrated in the following
SARA-R42 series LEXI-R422 module
No Name
ID
No Name
Remark for migration
1
GND
--
--
--
Several ground pins are available with LEXI-R422 modules
2
USB_3V3
R7 19 USB_3V3
Same 3.3 V (typical) USB supply input function / characteristics
3
GND
--
--
--
Several ground pins are available with LEXI-R422 modules
4
V_INT
A11 43 V_INT
Same 1.8 V generic digital interfaces supply output function / characteristics
5
GND
--
--
--
Several ground pins are available with LEXI-R422 modules
6
DSR
M1 11 DSR
Same UART DSR input and AUX UART flow ctrl input function / characteristics
7
RI
L1 10 RI
Same UART RI output and AUX UART flow ctrl output function / characteristics
8
DCD
J1 8
DCD
Same UART DCD output and AUX UART data output function / characteristics
9
DTR
K1 9
DTR
Same UART DTR input and AUX UART data input function / characteristics
10 RTS
H1 7
RTS
Same UART HW flow control input function / characteristics
11 CTS
G1 6
CTS
Same UART HW flow control output function / characteristics
12 TXD
F1 5
TXD
Same UART data input function / characteristics
13 RXD
E1 4
RXD
Same UART data output function / characteristics
14 GND
--
--
--
Several ground pins are available with LEXI-R422 modules
15 PWR_CTRL
P15 27 PWR_CTRL
Same power-on/off control input function / characteristics
16 GPIO1
R2 14 GPIO1
Same GPIO function / characteristics
17 USB_5V0
R10 22 USB_5V0
Same 5 V (typical) USB detection input function / characteristics
18 RSVD
--
--
--
Leave unconnected
19 GPIO6
R6 18 GPIO5
Same GPIO function / characteristics
20 GND
--
--
--
Several ground pins are available with LEXI-R422 modules
21 GND
--
--
--
Several ground pins are available with LEXI-R422 modules
22 GND
--
--
--
Several ground pins are available with LEXI-R422 modules
23 GPIO2
R3 15 GPIO2
Same GPIO function / characteristics
24 GPIO3
R4 16 GPIO3
Same GPIO function / characteristics
25 GPIO4
R5 17 GPIO4
Same GPIO function / characteristics
26 SDA
P1 13 SDA
Same I2C data input / output function / characteristics
27 SCL
N1 12 SCL
Same I2C clock output function / characteristics
28 USB_D-
R8 20 USB_D-
Same USB data line D- input / output function / characteristics
29 USB_D+
R9 21 USB_D+
Same USB data line D+ input / output function / characteristics
