User's Manual

HE910 Hardware User Guide
1vv0300925 Rev.28 – 2015-06-24
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 18 of 18
NOTE:
If not used, almost all pins should be left disconnected. The only exceptions are the following
pins:
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.
PAD Signal Notes
M1,M2,N1,N2,P1,P2 VBATT & VBATT_PA
E1,G1,H1,J1,L1,A2,E2,F2,G2,H2,
J2,K2,L2,R2,M3,N3,P3,R3,D4,M4,
N4,P4,R4,N5,P5,R5,N6,P6,R6,P8,
R8,P9,P10,R10,M12,B13,P13,E14
GND
R12 ON/OFF*
R13 HW_SHUTDOWN*
B15 USB_D+ If not used should be connected to a
Test Point or an USB connector
C15 USB_D- If not used should be connected to a
Test Point or an USB connector
A13 VUSB If not used should be connected to a
Test Point or an USB connector
N15
C103/TXD
If not used should be connected to a
Test Point
M15
C104/RXD
If not used should be connected to a
Test Point
L14 C105/RTS If the flow control is not used it
should be connected to GND
P15 C106/CTS If not used should be connected to a
Test Point
D15 TXD_AUX If not used should be connected to a
Test Point
E15 RXD_AUX If not used should be connected to a
Test Point
D13 VDD_IO1
It has always to be connected to
1V8_SEL
E13 1V8_SEL
It has always to be connected to
VDD_IO1
K1 MAIN ANTENNA
F1
ANT_DIV (if supported by the
product)
If not used it could left unconnected
but has to be disabled by the related
AT Command (AT#RXDIV);
please refer to the At User guide for
the related syntax
R9
ANT_GPS (if supported by the
product)
If the GPS is not used it could be
left unconnected