0

I2C pullups on Pro Trinket?
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

I2C pullups on Pro Trinket?

by twrackers on Tue Feb 05, 2019 2:07 pm

Do the SDA and SCL pins on the Pro Trinket (A4 and A5) have pullup resistors on the board? If so, what is their effective resistance?

twrackers
 
Posts: 83
Joined: Fri Jan 18, 2013 7:42 pm

Re: I2C pullups on Pro Trinket?

by adafruit_support_bill on Tue Feb 05, 2019 2:12 pm

Like most Arduinos and Arduino compatibles, The Pro Trinkets do not have i2c pullups.

All of our i2c breakout boards and shields have 10K pullups on the SDA and SCL pins.

adafruit_support_bill
 
Posts: 72783
Joined: Sat Feb 07, 2009 10:11 am

Re: I2C pullups on Pro Trinket?

by twrackers on Tue Feb 05, 2019 2:18 pm

Glad to hear that, I want to have a large number (5 or more) Pro Trinkets as I2C slaves on a common bus, and too many pullups spoil the bus.

twrackers
 
Posts: 83
Joined: Fri Jan 18, 2013 7:42 pm

Please be positive and constructive with your questions and comments.