ID-O-Matic Manual
6/16/2004
Page 2 of 5
Chip Pinout Information
Pin Port
IN/OUT
FUNCTION
1
A2
NA
Unused, leave unconnected
2
A3
NA
Unused, leave unconnected
3
A4
NA
Unused, leave unconnected
4
A5/
MCLR
IN
Reset input, active LOW. Tie high to Vdd with a 10K Ohm resistor. Use a SPST, normally -open
pushbutton switch to ground. This will reset the ID-O-Matic. In ID timer mode, this will silence the
alarm and restart the timing interval.
5
Vss
GROUND Vss (Ground)
6
B0
IN
TEST input, active LOW. Normally held high by an internal weak pull -up. Ground momentarily to
hear the programmed Morse code ID announcement without waiting for the timer to expire.
7
B1
IN
Serial RxD. Used for communication with a PC or other serial device.
8
B2
OUT
Serial TxD. Used for communication with a PC or other serial device.
9
B3
OUT
Audio (MCW) output. This square wave signal can be used to drive a very small speaker, amplified
and filtered, or fed into the audio chain of your repeater or rig.
10
B4
OUT
Red LED output
11
B5
OUT
Green LED output
12
B6
IN
INHIBIT input, active LOW. Normally held high by an internal weak pull -up. Drive this line LOW
to delay the ID for any length of time. For instance, this could be used to dela y ID until after a
SQUELCH input goes inactive to avoid hearing the ID while someone is transmitting.
13
B7
IN
START input, active LOW. Normally held high by an internal weak pull -up. Used only in repeater
mode. This input will start a timing cycle. If repeater mode is selected, the ID-O-Matic will only
announce if the START input has been active since its last ID. This avoids having a repeater ID every
ten minutes even if no one is transmitting.
14 Vdd
POWER Vdd, 3 to 5V
15
A6
OUT
CW output, active HIGH.
16
A7
OUT
PTT output, active HIGH. This goes active 100 milliseconds before the CW and audio ID starts, and
remains high 100 milliseconds after the message is complete.
17
A0
NA
Unused, leave unconnected
18
A1
NA
Unused, leave unconnected
Kit Construction:
Keep all semiconductor parts in the anti-static foam or tube until you are ready to use them. Always use good static prevention
practices when working with static sensitive parts. This means you should wear a grounding strap when possible, o r work on a
static-dissipative work surface. Use a grounded tip soldering iron. When soldering small parts it is a good idea to use a small,
pencil-type soldering iron of no more than 25 Watts or so, or a temperature controlled soldering station. Use pl iers, clamps or
alligator clips as heat sinks to prevent heat damage to parts while soldering. If you are not fairly experienced with soldering
small parts, you may want to practice on some scrap parts first or get some help.
Work in an area with good lighting. You may want to use a magnifying lens to do some of the small soldering required. Insert
each component from the top of the board (the side with the white silkscreen lettering), in the order shown in the table below.
As each component is installed, solder the leads and trim off excess leads with a small pair of side cutters.
