Evaluation Board
User’s Manual 14 Rev. 1.2, 2013-06-06
Software Description for Evaluation Kits
3.1.5 Programming Interface
The TLI4970 contains a special programming interface (SICI), which allows the user a bidirectional communication
with the sensor via a single pin. For this communication, the OCD pin is used. Due to the bidirectional data transfer,
the level shifting between the +5 V micro controller on the PGSISI-2 and the 3.3 V current sensor domain needs
a special level shifter. On the Evaluation board, this bidirectional level shifter is realized by a NMOS-source-
follower.
Note: This voltage follower is not needed in applications, where the micro controller and the sensor are working
on the same voltage domain.
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