With the I2C output card, 8 digital consumers can be switched.
The power transistor BD676 can switch 40V 1A.
With the I2C output card, 8 digital consumers can be switched.
The power transistor BD676 can switch 40V 1A.
The outputs are galvanically isolated from the I2C bus using optocouplers.
The circuit uses the negative logic because the I2C port expansion module PCF8574 switches on all outputs at voltage.
When controlling, only the desired bit pattern has to be inverted. Or subtract from the 255 desired output value before transferring it to the output card.
Dimension of the circuit board 42 mm x 63 mm
| 1 | circuit board I2AT_LP lead-free tinned with solder resist |
| 1 | Resistor network 8x 10k |
| 1 | Resistor network 8x 4,7k |
| 1 | Resistor network 8x 820 Ohm |
| 8 | LED 3mm 2mA green |
| 1 | Ceramic Capacitor 100 nF |
| 1 | PCF8574P or PCF8574A + IC socket 16 pin |
| 8 | power transistor BD676A |
| 2 | Opto coupler TLP293-4 soldered |
| 3 | pin connectors 3 pol and Jumper |
| 1 | terminal 4 pol. |
| 1 | terminal 10 pol. |
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