[sdiy] 7-segment LED displays with 4511 driver chip - max current?

Rick Jansen rick.jansen at xs4all.nl
Sat Aug 8 00:42:24 CEST 2015





> On 08 Aug 2015, at 00:34, john slee <indigoid at oldcorollas.org> wrote:
> 
>> On 7 August 2015 at 17:04, Rick Jansen <rick.jansen at xs4all.nl> wrote:
>> I2C may be relatively slow, but this is a user-interface thingy, and we humans are very very slow, compared to I2C. Well, I am.
>> I'll see how I fare. I really like I/O extension of the Arduino with the PCF8574 chips, and the way that one pin change gives you an interrupt. (Shift registers don't do that.) 
> 
> If you're using the PCF8574 you may also want to have a look at Microchip's MCP23017 (i2c) and MCP23S17 (SPI). Other than the bus interface the i2c and SPI versions are very similar. 
> 
> John

Ok! Difference is that MCP23017 is more versatile with output current, it can both source and sink 25mA per pin, where the PCF can only sink current on sn output pin.

Thanks,

rick
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