Datasheet

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

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4.4.2 ADC for analog Hall signals or analog sin-cos-encoders AENC_UX, AENC_VN, AENC_WY

For analog Hall and for analog encoder, the ADC engine has three disserential input channles (AENC_UX_POS,

AENC_UX_NEG), (AENC_VN_POS, AENC_VN_NEG), and AENC_WY_POS, AENC_WY_NEG). The analog encoder

ADC inputs can be conﬁgured single ended (AENC_UX_POS, AENC_VN_POS, AENC_WY_POS) with negative

inputs (AENC_UX_NEG, AENC_VN_NEG, AENC_WY_NEG) internally connected to ground.

The three channels AENC_UX, AENC_VN, AENC_WY are for three phase analog sine (with +/-120

phase

shift) wave Hall signals. The Signals AENC_UX and AENC_WY are for two phase analog sine wave and cosin

wave Hall signals. The Signals AENC_UX and AENC_WY are for analog sin-cos-encoder. The AENC_VN is

for an optional zero pulse channel of sin-cos-encoders. The AENC_VN is available for read out by the

application software but it is not hardware handled by the TMC4671 for position zerroing.

For long analog signal lines, it might be necessary to use external diﬀerential receivers with twisted pair

line termination resistors to drive the single ended analog encoder inputs of the TMC4671.

4.4.3 ADC supply voltage measurement ADC_VM

The ADC channel for measurement of supply voltage (ADC_VM) and is associated with the brake chopper.

The ADC_VM is available as raw value only without digital scaling. This is because it is not directly processed

by the FOC engine.

Info

ADC_VM must be scaled down electrically by voltage divider to the allowed voltage

range, and might require additional supply voltage spike protection.

4.4.4 ADC_VM for Brake Choppper

The ADC_VM is available as input for optional brake chopper as raw value u16. The brake chopper

thresholds have to be set as absolute u16 values to activate and deactivate the brake chopper output

depending on the ADC_VM value.

4.4.5 ADC EXT register option

The user can write ADC values into the ADC_EXT registers of the register bank from external sources or

for evaluation purposes. These values can be selected as raw current ADC values by selection. ADC_EXT

registers are primarily intended for test purposes as optional inputs for external current measurement

sources.

4.4.6 ADC general purpose analog inputs AGPI_A and AGPI_B

Two general purpose ADC channels are single-ended analog inputs (AGPI_A, AGPI_B). The general purpose

analog ADC inputs AGPI_A and AGPI_B are available as raw values only without digital scaling. This is

because these values are not directly processed by the FOC engine. These general purpose analog

inputs (AGPI) are intended to monitor analog voltage signals representing MOSFET temperature or motor

temperature. They are two additional ADC channels for the user. Optional, the AGPI_A is availabe as

analog target value signal.

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