AL7020S Designer’s Guide
Doc. No. DG_7020B
Altec Electronic AG
Seite 10 / 32
Table 3-2. Signal Descriptions
Label
I/O Type
Signal Name/Description
VCC PWR
+5 VDC.
A standard 5V +/- 5% - 1.5A power supply is strictly required to
supply this module (5V Versions). Average current is 270mA
(350mA @ PCL5). See also chapter 5.1.2
+3.-3 VDC.
A standard 3.3V +/- 5% - 1A power supply is strictly required to
supply this module (3V Versions). Average current is 270mA
(350mA @ PCL5). See also chapter 5.1.3
GND GND
Digital Ground
Connect to Digital Ground on the interface circuit.
~RESET IC
Modem Reset (ON/OFF).
To be pulled to ground by external transistor for
reset. (on module pull-up resistor of 200K). The GSM Modem has already an
internal power-up reset circuit. Needs special timing for RESET and ON/OFF
function (see chapter 3.8)
AGND GND
Analog Ground.
if a microphone or headset is used, use this as a ground. If
these are never used, it can be connected to DGND.
OPTIONAL SIM CARD READER INTERFACE
Label
I/O Type Signal Name/Description
SIMCLK O
SIM Clock
. Provided from module.
SIMRST O
SIM Reset
. Provided from Module to reset the SIM Card.
SIMDATA I/O
SIM Data line
. Digital, bi-directional data line to exchange data between
module and SIM card.
SIMVCC PWR
SIM Power Supply
. 3VDC Power Supply provided from module to power
the SIM Card. Only 3V SIM Cards are supported.
