User's Guide

LE866 HARDWARE USER GUIDE 1vv0301210 Rev.0 Preliminary 2015-09-02 16 of 68
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If not used, almost all pins should be left disconnected. The only exceptions are the following pins:
PAD
Signal
Note
E2
VBATT
E0
VBATT_PA
E1
VBATT_PA
B0, D0, F0, G0, D1, F1, G1,
D2, F2, C3, E3, F3, G3, F6,
A8, G8, A11, G11
GND
G2
Main Antenna
C0
Diversity Antenna
A4
C103/TXD
If not used should be connected to a Test Point
A5
C104/RXD
If not used should be connected to a Test Point
A1
C105/RTS
If not used should be connected to a Test Point
B1
C106/CTS
If not used should be connected to a Test Point
G6
VAUX / PWRMON
G4
RESET*
C1
TXD_AUX
If not used should be connected to a Test Point
C2
RXD_AUX
If not used should be connected to a Test Point
E5
USB D+
If not used should be connected to a Test Point or an
USB connector
E6
USB D-
If not used should be connected to a Test Point or an
USB connector
C7
SIMVCC
B7
SIMRST
A7
SIMCLK
A6
SIMIO
D8
VDDIO_IN
To be connected to VAUX (R0 resistor in series for
debug purposes)
RTS pin should be connected to the GND (on the module side) if flow control is not used.
The above pins are also necessary to debug the application when the module is assembled on it so we
recommend connecting them also to dedicated test point.