Tibbit #11: Four Open-Collector Outputs, M1S

Description

Tibbit #11: Four Open-Collector Outputs, M1S
TIBBIT_11
This is a Tibbit module — part of the Tibbo Project System that allows you to build your own custom embedded device with only the components you need. Start with a
Tibbo Project PCB
, add
Tibbits
like this one, then place the built design into a
Tibbo Project Box
to complete your product.
Tibbit #11: Four open collector outputs.
Transistors are rated for a maximum voltage of 24V and a maximum per-channel current of 0.5A. Note that the maximum current should not be exceeded even at lower voltages. Do not apply negative voltage!
To open a transistor, set the corresponding control line LOW. When left unconnected, control lines default to HIGH (and, hence, transistors will be closed).
Combine this Tibbit with a terminal block
C
Tibbit
#20
(nine terminal blocks) or
#21
(four terminal blocks). Note however that #21 doesn't provide the ground line which is required between the outside world and your system, so you would need to "steal" the ground from somewhere else.
One additional possible use of this Tibbit is for the emulation of clock/data or Wiegand card readers. The Tibbo Project PCBs have the unique ability to produce data output in the clock/data or Wiegand format. This is achieved through the
ser
object running in the clock/data or Wiegand mode. Card readers usually have open-collector outputs, so this Tibbit is ideally suited as the hardware front-end for the job. For this to work, the Tibbit has to be connected to the TX and RTS lines of the CPU's UART (see
[
SER
]
). As with many "real" readers, the equipment on the receiving end will need pull-up resistors.
There are four red LEDs each of which is connected to one of the four control lines. These LEDs are buffered (with logic gates) and light up for the LOW state (i.e. when transistors are in the opened state).
Form:
M1S
Power:
5V; consumes 50mA
Special lines:
[
SER
] (if reader emulation is desired)
Mates with:
#19
,
#20
,
#21
(limited use)
Similar to:
#16
M1S Tibbit Modules Overview
M1S
Tibbits are single-width modules occupying one standard
M
socket on a Tibbo Project PCB (i.e.
TPP2
or
TPP3
). Their footprint is roughly "squares" (one "square" is The
M1S
modules are 12.5mm high.
M1
modules have two rows of 6 pins:
Pins 8-11
are control lines
A-D
. They provide the interface to programmable modules or other microcontrollers. On Tibbo Project PCBs, these pins are connected to the main processor.
Pins 2-5
are I/O lines facing the outside world. On Tibbo Project PCBs, they go to
C
Tibbits.
Pins 6 and 12
are the GROUND and +5V power pins. Most Tibbit Modules consume (take) 5V power. There are also power supply Tibbits that generate 5V power from a variety of sources. Those
output
5V through
pin 12.
Pins 1 and 7
are for the additional +15V and -15V voltages. These are optional and only needed by few Tibbits. A special power supply Tibbit (
#12
) generates ±15V from the main 5V power.
7 × 14
2.54 × 2.54 mm).