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 #14: Four-channel DAC with -10V ~ +10V range.
This DAC Tibbit has an MCP4728 12-bit DAC with I2C interface. The analog front-end of the module allows signal output in the -10V to +10V range respective to the system ground.
The MCP4828 DAC IC has 12-bit resolution. This Tibbit has an effective resolution of around 9~10 bits. This reduction is caused by the system noise and other factors affecting the measurement quality.
Combine this Tibbit with #20 (nine terminal blocks) or #19 (DB9M connector). It's not common but possible to use the latter for wiring into the DAC outputs. Tibbit #21 (four terminal blocks) can also be used but you will have to steal the ground elsewhere, as #21 doesn't have its own ground line and the DAC output voltages are with respect to the system ground.
This module requires Tibbit #12 to be present on the TPP board as well. #12 is necessary for producing +15V and -15V power for the DAC circuitry.
There are two red, one yellow and one green LED. The red LEDs are connected to the SCL and LDAC lines; the yellow LED to the SDA line; the green LED to the BUSY line.
- Form: M1S
- Power: 5V consumes 56mA; +15V consumes 4mA; -15V consumes 4mA
- Mates with: #19, #20, #21
Sample Project The use of this and other I2C Tibbits is illustrated by a group of Tibbo BASIC test projects.
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) generates ±15V from the main 5V power.