User's Guide

ATOP3.5G Product Description
80447ST10636A rev.10 – 2015-03-03
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights
Reserved. Page 14 of 66
Mod. 0808 2011-07 Rev.2
Symbol
[1]
Pin Level Description
[2]
VDD_SPKR H17 power supply for class D amplifier
VCHG_SNK G10; H10 charger supply connection
VBAT_SENSE E10 battery voltage sense
BB_ICHG H11 charger output
BB_BATT_FET_N E11 external charge FET control
BB_BATT_THERM H18 battery thermistor
VIO_REF P5 voltage (1.8 V) reference for
baseband digital interface
VADC_REF W16 voltage reference for MC_ADC
VADC_GND W17 ground reference for MC_ADC
VUSIM_SRC J13 USIM power supply
VDD_3V0_SRC N19 microcontroller current source and
voltage reference
VDD_3V0_SRC_ENA W18 enables VDD_3V0_SRC (active
HIGH, internal pull up)
Clock generation
BB_EXT_CLK D10 2.6 clock source
MC_XTAL1 M13 optional quartz for microcontroller
MC_XTAL2 N7
GPS_1PPS R4 1.8 one pulse per second (output)
System reset
MC_RESET L15 3.0 reset ATOP module [14]
Antennas
NFC antenna
NFC_ANT1 W10 TX1
NFC_ANT2 W11 TX2
NFC_ANT3 V12 RX
Cellular antenna
CELL_ANT1 C1 [15]
CELL_ANT2 A3 [15]
GPS antenna
GPS_PAS_ANT V1 passive GPS antenna input
GPS_ACT_ANT W3 active antenna input
GPS_ACT_ANT_BIAS T4 active antenna bias (1 V PIN diode
drop inside ATOP 3.5G) [16]
GPS_PAS_ANT_DIS T2 passive antenna disable:
3-state: internal LNA enabled;
active LOW: internal LNA disabled
Industrial test
Baseband JTAG
BB_JTAG_NTRST E9 1.8