MOD-GSM-B Olimex Ltd., MOD-GSM-B Datasheet - Page 10

• Manufacturer Part Number: MOD-GSM-B
• Description: RF Modules & Development Tools GSM-B WIRELESS PROTOTYPE MODULE
• Manufacturer: Olimex Ltd.

Specifications of MOD-GSM-B

• Board Size: 33 mm x 33 mm x 3 mm
• Product: RF Development Tools
• Maximum Frequency: 1900 MHz
• Output Power: 2.5 mA
• Antenna: External
• Supply Voltage (max): 4.5 V
• Maximum Operating Temperature: + 55 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

JUMPER DESCRIPTION
BAT_E
4V_E
4V
5V_CHG_E
DCDC_E
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DTX/ MTX
Default state – open.
Default state – open.
Default state is open
Default state - open
Default state is DTX
Default state closed
Default state closed
Connects 3.7V Li-ion battery to the GSM module. Default state is to be open to not
drain the battery during stocking the modules.
This jumper is used when power the module without
enable 4V to the DCDC output.
This jumper is used when power the module without battery. When connected the
jumper enable 4V to VBAT power pins of SIM340D module.
This jumper is used when the battery is present and allows battery charging.
Connects the DCDC converter output (5V or 4V according 4V_E jumper state) to
VCHG power pin of SIM340D module.
Enable DCDC. Connect DCDC output ((5V or 4V according 4V_E jumper state) to the
module.
When the jumper is closed allow SIM340D firmware upgrade.
The DebugTX/MainTX defines whether Debug TX terminal or Main TX terminal of
SIM340D module is connected to FT232RL virtual com port driver.
Important: 4V_E, 4V and 5V_CHG_E jumpers have to be moved together.
Do not plug in external +12V if BAT_E jumper is open!
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battery.
When connected