AL7020S, AL7024S Designer’s Guide
Doc. No. DG_7024E 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.
