User's Manual

HC864-AUTO Hardware User Guide
1vv0300946 Rev.4 – 2012-12-27
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 69 of 77
15.4. EMC recommendations
HC864-AUTO 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:
Pin Signal I/O Function Contact Air
Power Supply
1,2,3,4
VBATT - Main power supply ± 8KV ± 15KV
SIM Card Interface
18
SIMVCC - External SIM signal – Power supply for the SIM ± 8KV ± 15KV
19
SIMRST O External SIM signal – Reset ± 8KV ± 15KV
20
SIMIO I/O External SIM signal - Data I/O ± 8KV ± 15KV
22
SIMCLK O External SIM signal – Clock ± 8KV ± 15KV
Miscellaneous Functions
35
USB_ID AI
Analog input used to sense whether a peripheral device is
connected
± 8KV ± 15KV
Miscellaneous Functions
48
USB_VBUS AI Power sense for the internal USB transceiver ± 8KV ± 15KV
50
VAUX1 - Power output for external accessories ± 8KV ± 15KV
53
ON/OFF I
Input command for switching power ON or OFF (toggle
command).
± 8KV ± 15KV
54
RESET I Reset input ± 8KV ± 15KV
55
VRTC AO Power supply for RTC block ± 8KV ± 15KV
Antenna
PAD
Antenna Pad AI Antenna pad for Rosenberger connector ± 8KV ± 15KV
All other pins have the following characteristics:
HBM JESD22-A114-B ± 2000 V
CDM JESD22-C101-C ± 500 V
The Board to Board connector has to be considered as NO TOUCH area.
Appropriate series resistors have to be considered to protect the input lines from overvoltage.