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PCA9745B Rext range

Question asked by John Wehle on May 28, 2019
Latest reply on May 30, 2019 by G.w. Sun

The datasheet explicitly mentions using Rext of 1k or 2k.
Fig 9 "Maximum ILED versus Rext" shows values of 1k through 10k.
Equations 4 and 5 can be used to calculate Rext.

 

What is the supported range for Rext over which the device will be well behaved?

 

More specifically I'm interested in a peak value of 2 mA which works out to a 28.7k resistor for Rext ... any issues
with that configuration?

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