On 4/15/12 10:37 AM, Quixotic Nixotic wrote:
The DS2321 will be the only surface mount part...
I know. I was being silly.
The 18F2520 PIC ports I am using for the I2C bus say they are TTL, so presumably they are not open collector, thus my question whether I need any additional pullups.
The generic ports are TTL, but when they get configured for I2C, they become open-collector. I2C requires the pull-up resistors to implement its tricky protocol over two wires.
You'll have to find the room for them. If it helps, 1/8 watt resistors are a bit smaller than 1/4 watt resistors.
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