Single wire interface module (SWIM) UM0470
12/39 DocID14024 Rev 4
3.3.2 Low speed bit format
1 bit is generated with twenty-two SWIM clock pulses.
The bit format is:
• 2 pulses at ‘0’ followed by 20 pulses at ‘1’ for ‘1’ value.
• 20 pulses at ‘0’ followed by 2 pulses at ‘1’ for ‘0’ value.
When the SWIM receives a data packet, it will decode:
• ‘1’ when the number of consecutive samples at ‘0’ is less or equal to 8.
• ‘0’ when the number of consecutive samples at ‘0’ is greater or equal to 9.
Figure 7. Low speed bit format
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