Datasheet

TMC4671 Datasheet • IC Version V1.3 | Document Revision V2.00 • 2020-Apr-17

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4.6.12 Reference Switches

The TMC4671 is equipped with three input pins for reference switches (REF_SW_L, REF_SW_H and REF_SW_R).

These pins can be used to determine three reference positions. The TMC4671 displays the status of the

reference switches in the register TMC_INPUTS_RAW and is able to store the actual position at rising

edge of the corresponding signal. The signal polarities are programmable and the module reacts only on

toggling the ENABLE register. The signals can be ﬁltered with a conﬁgurable digital ﬁlter, which suppresses

spike errors.

With the STATUS_FLAGS and STATUS_MASK register the STATUS output can be conﬁgured as an IRQ for

passing a reference switch.

The actual position can be latched when passing a reference switch. The latched positions are displayed in

registers HOME_POSITION, LEFT_POSITION, and RIGHT_POSITION. The position latching can be enabled

with REF_SWITCH_ENABLE. The polarity of each Reference switch can be changed with corresponding

polarity registers HOME_SWITCH_POLARITY, LEFT_SWITCH_POLARITY, and RIGHT_SWITCH_POLARITY. If a

reference switched is passed the corresponding status bit (HOME_SWITCH_PASSED, LEFT_SWITCH_PASSED,

and RIGHT_SWITCH_PASSED) is enabled. With disabling of the latching function the status bits are cleared.

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