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HAPTER 4 – DEVELOPER BOARD AND SCHEMATICS
Board Components
Schematic
PCB Label or
Jumper Label
Location
J19
Next to
stereo jack.
J25& J26
GND LUG
JP1
Speaker
JP13
USB PWR
JP16
JTAG
JP17
Mosquito
JP18
MOD PWR
JP19& JP20
JP21 & JP22
Antenna
JP24 & JP25
Antenna
JP28
Handset
Digital
JP49
SPK
JP50
MIC
JP83 & JP84
ATtiny25
JP85
1.8V 5V
JP87
Board PWR
Select
JP88
JTAG PWR
Select
JP89
SER TL
JP90
RS232
S1
Next to 9VDC
Power Jack
S5
RESET
Jxx indicates jacks.
29
Description
Allows a stereo jack feed. Default is ON. If ON, then left and right stereo channels
are combined and form a mono channel.
Ground lug.
Mutes the speaker. Default positions are 1 and 2 (speaker is not muted).
Set either 5V or 3.3V for USB_VBUS line (supplied by the VCC of the USB jack).
JTAG header.
Mosquito header. If used to debug the SocketModem while using the USB port,
remove the JP13 to disconnect USB_VBUS.
Power feed (Vcc) SocketModem module. (X3).
Debugging probes pins for SocketModem.
Antenna ground select.
Antenna ground select.
Digital handset jack, 4 pin connector (not labeled on schematic).
Speaker jack header.
Microphone jack header.
ATtiny25 6-pin programmer headers.
Selects operating voltage (1.8v or 5v) for the ATtiny25v micro-controller.
The 5V/3.3V regulator. Factory default operating voltage is 5V.
Warning:
Verify that the 5V/3.3V jumper matches your SocketModem's
requirements. If this jumper is set incorrectly, you could damage the
SocketModem and/or Test/Demo board.
Use only the Multi-Tech Systems supplied transformer with the
Test/Demo board. Using any other power source voids the warranty
and will likely damage the Test/Demo board and SocketModem.
Selects operating voltage (5v or 3.3v) for the JTAG.
Testing interface (debugging) for the serial TTL signals.
Testing interface (debugging) for the RS-232 signals.
Board input power switch (not labeled on schematic).
Reset push switch.
Multi-Tech Systems, Inc. Universal Socket Developer Guide
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