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Module Interface
The module is connected to the Test Harness by a 60 way multiway connector (component
reference J1) with a board to board stacking height of 3mm.
The connector part numbers are:
On module Manufacturer AVX-Elco Part No. 14-5087-060-930-861
Ubinetics Part No. UNCON00150
On Test Harness Manufacturer AVX-Elco Part No. 24-5087-060-900-861
Ubinetics Part No. UNCON00252
As the module relies on the legs of the mounting can to provide a low impedance ground
connection, two spring clips are mounted on the Test Harness make connect with the module
can when the module is plugged into the harness.
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◆Module Expansion Connector
A 60 way dual row pin header (component reference J2) provides access to every signal on the
module interface connector with identical pin numbering. The component legend printed on the
Test Harness gives pin number guidance.
The header uses 0.025” square pins on 0.1” pitch.
A suitable mating dual row connector is 3M Interconnect Solutions 8560-4500JL
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◆Power Supplies
The Test Harness provides power for both the module and the various support devices
mounted on the harness pcb using 4mm board mounted sockets.
Sockets J4 (red, positive) and J5 (black, ground) provide supply to the module Main Power
pins (pcb signal name ‘VBAT’). In customer applications of the module it would normally be
powered by a single Lithium Ion cell and hence the nominal voltage applied to these sockets is
3.6 volts. For development work this could be from a bench power supply. Full GSM operation
requires the source to be capable supplying 300mA average, 2.7A peak.
Jumper LK30 connects an additional 1000uF smoothing capacitor to the VBAT rail.
Jumpers LK21 and LK21A may be removed and replaced by a current meter to measure the
module’s current drain.
Sockets J18 (red, positive) and J17 (black, ground) provide supply to the support devices (pcb
signal name ‘VCC’). This is a low current supply mainly used to power RS232 level converter
chips. The voltage applied to these sockets should be in the range 3.4 to 5.5 volts and would
normally be from a bench power supply. Total current drain should be < 10mA excluding any
external load added by the user.
Jumper LK26 can be fitted to link ‘VBAT’ to ‘VCC’. In this case sockets J17,18 may be left
unconnected with all circuits driven from a 3.6 volt (nominal) supply.
Suitable (stackable) 4mm plugs are RS Components 444-567 (Red), 444-539 (Black).
Ubi Netics Technical Note CDD-2001-0039-TN-A
Confidential - óUbiNetics Ltd 2002 U01-210-003/02 Iss: 001 8 of 14
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Battery Charger Interface
The GM230 module provides on-board circuitry to charge a single Lithium Ion cell connected to
its Main Power pins. The battery charger (or simulating circuit) is connected via 4mm socket
J13 (red, positive) and J5 (black, ground, shared with module Main Power). The charger supply
(pcb signal name ‘+VCHARGE_IN’) should be a constant current, set to the required charging
current (max 800mA), with an open circuit voltage in the range 4.8 to 7.0 volts.
Jumper LK32 can be fitted to connect an additional 1000uF smoothing capacitor to the
+VCHARGE_IN rail.
The charging current can be monitored by removing jumpers LK31, 31A and replacing them
with a current meter .
Note: This supply should not be connected when an external power supply, rather than a
Lithium Ion cell, is powering the module Main Power terminals.
Suitable 4mm plugs are as detailed in sect.3.3 above. |
