HE920 Hardware User Guide
1vv0301014 Rev.9 – 2014-01-23
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
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Page 75 of 84
14.4.
EMC recommendations
HE920 signals are provided by some EMC protections. In any case the accepted levels are
different on the pins. The characteristics are described in the following Table:
Pad
Signal
I/O
Function
Contact
Air
Power Supply
AP17,AP19,
AR18,AS17,
AS19,AT18,
AU17,AU19
VBATT_PA
And VBATT
-
Main power supply
± 8KV
± 15KV
SIM Card Interface
A8
SIMVCC
-
External SIM signal – Power supply for the SIM
± 8KV
± 15KV
B11
SIMRST
O
External SIM signal – Reset
± 8KV
± 15KV
B9
SIMIO
I/O External SIM signal - Data I/O
± 8KV
± 15KV
A10
SIMCLK
O
External SIM signal – Clock
± 8KV
± 15KV
Miscellaneous Functions
P17
VAUX
-
Power output for external accessories
± 8KV
± 15KV
AS1
ON/OFF
I
Input command for switching power ON or OFF
(toggle command).
± 8KV
± 15KV
AP1
RESET
I
Reset input
± 8KV
± 15KV
F17
VRTC
AO Power supply for RTC block
± 8KV
± 15KV
Antenna
AD1,AU9,S1
Antenna Pad
AI
Antenna pad
± 8KV
± 15KV
All other pins have the following characteristics:
HBM JESD22-A114-B ± 2000 V
CDM JESD22-C101-C ± 500 V
Appropriate series resistors have to be considered to protect the input lines from overvoltage.
