Difference between revisions of "I2C splitter"
| Line 12: | Line 12: | ||
* Mounting hole diameter: 3mm |
* Mounting hole diameter: 3mm |
||
* Mounting hole pitch: 44x19mm (3mm from board edge) |
* Mounting hole pitch: 44x19mm (3mm from board edge) |
||
= pinouts = |
|||
Hold the board such that the 4x8 pin array is on the left. |
|||
The 4x8 array has from left to right, GND (labeled "V-" because "GND" didn't fit), SDA (labeled DA), SCL (CL), and VCC (V+). |
|||
From top to bottom you will find bus 0 at the top to bus 7 at the bottom. |
|||
Connect your "master device" to the connector on the left or right. The pinout is GND, SDA, SCL, VCC from bottom to top. |
|||
= jumpers = |
|||
== address jumpers == |
|||
It is recommended you use address 0 for the PCA9548A, unless that clashes with something on your I2C bus. Put all three jumpers to the position nearest you, in the position marked "0". |
|||
== Power jumper/power connector == |
|||
If your board has a jumper labeled "VOUT" near the bottom, this can be used to select the voltage level on the output bus. Connect a jumper on the rightmost two pins (AUX/VCC) to use the power from the "master" connector on the left or right of the PCB. If that is undesired, for example if your slave devices are 3.3V, you can connect a 3.3V power source to the ground pin on the left and the VAUX pin in the middle. |
|||
= using the board = |
= using the board = |
||
Revision as of 12:56, 24 October 2014
general info
Based on the PCA9548A chip from NXP
http://www.nxp.com/documents/data_sheet/PCA9548A.pdf
I2C address:
1110 000 tru 1110 111 (jumper selectable)
Each I2C output has 4K7 pull-up resistors.
physical dimensions
- Board outline: 50x25mm
- Mounting hole diameter: 3mm
- Mounting hole pitch: 44x19mm (3mm from board edge)
pinouts
Hold the board such that the 4x8 pin array is on the left.
The 4x8 array has from left to right, GND (labeled "V-" because "GND" didn't fit), SDA (labeled DA), SCL (CL), and VCC (V+).
From top to bottom you will find bus 0 at the top to bus 7 at the bottom.
Connect your "master device" to the connector on the left or right. The pinout is GND, SDA, SCL, VCC from bottom to top.
jumpers
address jumpers
It is recommended you use address 0 for the PCA9548A, unless that clashes with something on your I2C bus. Put all three jumpers to the position nearest you, in the position marked "0".
Power jumper/power connector
If your board has a jumper labeled "VOUT" near the bottom, this can be used to select the voltage level on the output bus. Connect a jumper on the rightmost two pins (AUX/VCC) to use the power from the "master" connector on the left or right of the PCB. If that is undesired, for example if your slave devices are 3.3V, you can connect a 3.3V power source to the ground pin on the left and the VAUX pin in the middle.