SLIS136C September 2011 – September 2019 TPL0501-100
The TPL0501 has a single linear-taper digital potentiometer with 256 wiper positions and an end-to-end resistance of 100 kΩ. The potentiometer can be used as a three-terminal potentiometer or as a two-terminal rheostat. The potentiometer can be used in either voltage divider mode or rheostat mode.
The high (H) and low (L) terminals of the TPL0501 are equivalent to the fixed terminals of a mechanical potentiometer. The H and L terminals do not have any polarity restrictions (H can be at a higher voltage than L, or L can be at a higher voltage than H). The position of the wiper (W) terminal is controlled by the value in the
8-bit Wiper Resistance (WR) register. When the WR register contains all zeroes (zero-scale), the wiper terminal is closest to its L terminal. As the value of the WR register increases from all zeroes to all ones (full-scale), the wiper moves from the position closest to the L terminal, to the position closest to the H terminal. At the same time, the resistance between W and L increases, whereas the resistance between W and H decreases.