User's Guide

HE863 Family Hardware User Guide
1vv0300891 Rev.5
- 2011-03-18
Reproduction forbidden without Telit Communications S.p.A’s. written authorization - All Rights
Reserved. Page 16 of 89
Ball Signal I/O Function
Internal
Pull up
Type
K4 C106/CTS O
Output for Clear to send signal
(CTS) to DTE
CMOS 1.8V
K3 C105/RTS I
Input for Request to send
signal (RTS) from DTE
CMOS 1.8V
J4 C104/RXD O Serial data output to DTE CMOS 1.8V
J3 C103/TXD I
Serial data input (TXD) from
DTE
CMOS 1.8V
USB
S8 USB_VBUS
Power supply for the internal
USB transceiver
5V
S9 USB_ID(TBD) AI
Analog input used to sense
whether a peripheral device is
connected.
Analog
R9 USB_D+ I/O USB differential Data (+) 3.3V
R8 USB_D- I/O USB differential Data (-) 3.3V
DAC and ADC
S4 DAC_OUT AO Digital/Analog converter output Analog
S5 ADC_IN3 AI
Analog/Digital converter input
3/GPS ANT current detection
Analog
R5 ADC_IN2 AI
Analog/Digital converter input
2/GPS ANT voltage detection
Analog
R4 ADC_IN1 AI
Analog/Digital converter input
1/GPS ANT voltage detection
Analog
Miscellaneous Functions
G5 RESET* I Reset input Pull up 2.3V
C9 VRTC_2V3 AO VRTC Backup capacitor Power
B11 STAT_LED O Status indicator LED CMOS 1.8V
G4 ON_OFF* I
Input command for switching
power ON or OFF (toggle
command)
Pull up 2.3V
D10 PWRMON O Power ON Monitor CMOS 1.8V
A3 RF_ANT - Antenna for GSM/WCDMA – 50 ohm RF
P7
MODEM_RDY
(TBD)
O
Indicates that the boot
sequence completed successfully
CMOS 1.8V