The UDN2981A is an 18-pin chip which contains eight 'high-side switches' - The load connects between the transistor output and 0V and the transistor conducts current to V+ when turned on.
Darlington Driver (UDN2981A)
Schematic
PCB
Control of a ULN2981A driver.
This program outputs 8-bit data to the B.0 through B.7 pins which connect to an ULN2981A driver.
- Code Example:
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dirsB = $FF ; Make B.0 to B.7 outputs main: for b0 = $00 to $FF pinsB = b0 ; Put binary value to B.0 to B.7 pause 250 ; Wait a short while next goto main ; Repeat
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Create Module
There is no specific UDN2981A create module but the BCX38C darlington transistor create modules (low-side switch) may potentially be used instead (shown connected to buzzer).
Bill of Materials
| Description | Code | Qty | |
|---|---|---|---|
| UDN2981A Darlinton Driver | ? | 1 | Buy Now |
| 18-pin 0.3" DIL IC socket | ICH018 | 1 | Buy Now |
| 100nF miniature polyester capacitor | CAP001 | 1 | Buy Now |
Simulation
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