Multitech MMCModem MTMMC-G-F4, Руководство разработчика

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Chapter 3 – Electrical Characteristics
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D) 15
Power Supply Pins Electrical Interface
The main power supply is provided through a double connection. These connections are
respectively pins 3 and 4 for the +5V and the pins 1 and 2 for the ground (GND). The pins 6,
21, and 24 are also ground connection in order to produce a proper ground plane.
A 5V +/-5% - 1.3A power is strictly required to supply the modem. However, the power supply
does not have to constantly deliver 1.3A current at 5V.
This power supply is internally regulated to a nominal value VBATT.
Note: TXD, DTR, RTS input signals are 5V tolerant (these signals are the only 5V
tolerant signals)
Power Supply Pin Description
Pin # Name Description Comment
1 GND Ground High Current
2 GND Ground High Current
3 +5V Ground High Current
4 +5V Ground High Current
6 GND Ground High Current
21 GND Ground High Current
24 GND Ground High Current
Power Consumption of the Power Supply Electrical Interface
Power Consumption in E-GSM900 & GSM850 @ 25 degrees C – Class 5
Conditions I
NOM
I
MAX
+5V During TX bursts @2W 1.2 A 1.3 A
+5V Average @ 2W 250 mA 320 mA
+5V Average @ ).5W 180 mA 200 mA
+5V Average idle mode 15 mA 25 mA
Power Consumption in GSM1800 & 1900 MHz @ 25 degrees C – Class 5
Conditions I
NOM
I
MAX
+5V During TX bursts @1W 1.1 A 1.2 A
+5V Average @1W 210 mA 235 mA
+5V Average @ 0.25W 165 mA 185 mA
+5V Average idle mode 15 mA 25 mA
Power Consumption in E-GSM/GPRS 900 MHz & GSM/GRPS 850 MHz Mode – Class 10
Conditions I
NOM
I
MAX
+5V During TX bursts @ 2W 1.2 A 1.3 A
+5V Average @ 2W 420 mA 470 mA
+5V Average @ 0.5W 280 mA 320 mA
+5V Average idle mode 15 mA 25 mA
Power Consumption in GSM/GRPS 1800 MHz & GSM/GRPS 1900 MHz – Class 10
Conditions I
NOM
I
MAX
+5V During TX bursts @ 1W 1.1 A peak 1.2 A peak
+5V Average @ 1W 350 mA 400 mA
+5V Average @ .25W 180 mA 210 mA
+5V Average idle mode 15 mA 25 mA