266Tibbo Project System (TPS)
© Tibbo Technology Inc.
Pins on the M2 section have the standard positioning, except that not all pins 1-11
might be present, because the M2 and C2 sections of hybrid devices are
interconnected directly.
Tibbit Power Lines
By now you know that the main supply voltage for Tibbits is +5V, and that some
Tibbits also need +15V and -15V power. You also know that C1 Tibbits have no
standard ground and +5V pins, while C2s do not have a provision for -15V power.
Finally, you know that some Tibbits do not require any power. This section
continues with the explanation of Tibbit power lines.
The diagram above shows five Tibbits. Two of them are #10 (+5V power supply),
one is #01 (four-line RS232 port), another one is #12 (+15/-15V power supply), and
the last one is #13 (the ADC converter).
Notice how all five Tibbits have diodes in their power lines. On power consuming
Tibbits (#01, #13) these diodes prevent damage to Tibbits if power is accidentally
applied in reverse. On power generating Tibbits (#10, #12) the diodes allow you to
bank power sources. By having two power supply Tibbits (#10) you can either
combine their current output or increase reliability (by having several redundant
power sources).
Power, of course, can also be applied to the power rails externally (i.e. from a lab
power supply). Our own TPP2 and TPP3 boards have power terminals for direct 5V
power input. The boards do not have direct inputs for +15V and -15V. So, although
TPP2 and TPP3 have +15V and -15V power rails, the only way to have power on
them is to insert the Tibbit #12. You only have to do it if there are any Tibbits in
your system that require these optional voltages. On the above diagram, Tibbit #13
does require +/-15V.
One additional point. Power supply Tibbits that provide +5V power generate it from
external power sources. For example, Tibbit #10 takes DC input in the 9-18V range,
while Tibbit #23 implements PoE (power-over-Ethernet) power supply. Both take
external power and convert it into +5V. Tibbit #12, however, generates +15/-15V
voltages form the 5V power rail.
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