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Smart Bluetooth

Anonymous
Not applicable
‎May 12, 2016 10:02 AM

why wiced sense need a I2c expander

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In wiced sense shematics I saw that wiced sense using LTC4313

Why do we need a I2C expander?

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1 Solution
JacobT_81
Employee
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Employee
‎May 12, 2016 11:41 AM

Re: why wiced sense need a I2c expander

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I2C busses are limited by their picofarad load. They generally max out at about 400pf. And each sensor generally carries a load in the range of 100pf. 

This expander allows for a larger picofarad load on the bus.

Sometimes these expanders are also used as voltage level shifters on the bus.

Jacob

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1 Reply
JacobT_81
Employee
250 likes received 100 likes received 50 likes received
Employee
‎May 12, 2016 11:41 AM

Re: why wiced sense need a I2c expander

Jump to solution

I2C busses are limited by their picofarad load. They generally max out at about 400pf. And each sensor generally carries a load in the range of 100pf. 

This expander allows for a larger picofarad load on the bus.

Sometimes these expanders are also used as voltage level shifters on the bus.

Jacob