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 #12: Low-power non-isolated power supply with +15/-15V output, 5V input, shutdown control.
This Tibbit is capable of generating up to 15mA of +15V power and 15mA of -15V power from the main 5V supply rail. This Tibbit, therefore, does not rely on the outside power but instead generates ±15V from the internal main power of the Tibbo Project System.
The module is required for the correct operation of Tibbits #13 (ADC) and #14 (DAC).
This Tibbit has a base (idle) power consumption of 230mA. Each additional mA of current consumed on the +15V and -15V outputs results in 4.5mA of extra power drain on the 5V input. This 4.5 ratio is explained by the threefold difference in the input (5V) and output (15V) voltages, as well as associated power conversion losses.
The module has a dedicated shutdown (-SDWN) line. Pull the line LOW to disable this Tibbit.
There are two red and two green LEDs. The first red LED is connected to the +5V input. The second red LED is connected to the SHUTDOWN line and lights up when the line is LOW (i.e. when the module is in shutdown). Green LEDs are +15V and -15V power indicators.
* In this case, "Mates with" really means "doesn't mind them close" as this device requires no connector Tibbits for its own operation.
- Form: M1S
- Power: 5V consumes 230mA; +15V provides 15mA; -15V provides 15mA
- Mates with*: #19, #20, #31, #37
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 7 × 14 "squares" (one "square" is 2.54 × 2.54 mm). 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, this one) generates ±15V from the main 5V power.