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ZHCSPN7B March 2023 – August 2024 TMAG6181-Q1

PRODUCTION DATA

封裝選項(xiàng)

機(jī)械數(shù)據(jù) (封裝 | 引腳)

DGK|8
- MPDS028E

散熱焊盤機(jī)械數(shù)據(jù) (封裝 | 引腳)

訂購信息

6.3.4.1 AMR Output Parameters

Magnetic Response shows the single-ended output signals as SIN_P, SIN_N, COS_P and COS_N. These signals are ratiometric to the supply voltage (V_CC). The common-mode voltage (V_CM) of the individual signals is half of the supply voltage (V_CC /2). For single-ended signals, V_OUT is defined as the difference between the maximum and minimum output voltage for a rotating magnetic field. Use Equation 2 to calculate V_{OUT_SIN_P}.

Equation 2.

V_{O U T_S I N_P} = V_{S I N_P (m a x)} - V_{S I N_P (m i n)}

where

V_{SIN_P (max)} is the maximum output voltage across the full magnetic angle range
V_{SIN_P (min)} is minimum output voltage across the full magnetic angle range

Typically, V_OUT is around 60% of the supply voltage (V_CC). The diagnostic band indicates that the output signals are outside normal operating range and indicates a presence of fault.

TMAG6181-Q1 AMR Differential-Ended Output
Signals

Figure 6-7 AMR Differential-Ended Output Signals

Figure 6-7 shows the differential sine and cosine output signals generated from the corresponding sine and cosine single-ended outputs. Use Equation 3 and Equation 4 to calculate the differential voltages.

Equation 3.

V_{s i n_d i f f} = V_{S I N_P} - V_{S I N_N}

Equation 4.

V_{c o s_d i f f} = V_{C O S_P} - V_{C O S_N}

The offset of the differential signals is the average of the maximum and minimum voltages of the sine or cosine signals. Use Equation 5 and Equation 6 to calculate the offsets for the sine and cosine signals.

Equation 5.

V_{o f f s e t_s i n} = \frac{V_{s i n_d i f f (m a x)} + V_{s i n_d i f f (m i n)}}{2}

Equation 6.

V_{o f f s e t_c o s} = \frac{V_{c o s_d i f f (m a x)} + V_{c o s_d i f f (m i n)}}{2}

For single-ended signals, the offset is the common-mode voltage (V_CM).

Use Equation 7 to calculate the differential offset for sine and cosine channels at any given temperature, T_A

Equation 7.

V_{o f f s e t} = V_{o f f s e t, r o o m} + V_{o f f s e t_T C} \times (T_{A} - 25 ° C)

where

V_{Offset_TC} is the temperature drift coefficient of the offset
V_{Offset_room} is the room temperature offset

Use Equation 8 and Equation 9 to calculate the amplitudes of the differential signals.

Equation 8.

A_{s i n_d i f f} = \frac{V_{s i n_d i f f (m a x)} - V_{s i n_d i f f (m i n)}}{2}

Equation 9.

A_{c o s_d i f f} = \frac{V_{c o s_d i f f (m a x)} - V_{c o s_d i f f (m i n)}}{2}

Use Equation 10 to calculate the amplitude for single-ended signals.

Equation 10.

A_{s i n_p} = \frac{V_{s i n_p (m a x)} - V_{s i n_p (m i n)}}{2}

Amplitude asynchronism refers to the amplitude mismatch error between sine and cosine channels. Use Equation 11 to calculate the amplitude mismatch error.

Equation 11.

k = 1 - (\frac{A_{c o s_d i f f}}{A_{s i n_d i f f}})

The sine and cosine output signals are typically out-of-phase by 90 degrees, but if an internal phase error occurs owing to sensor and other on chip circuitry non-idealities, the sine and cosine outputs from the sensor can be different than the ideal 90 degrees. This error is referred to as the orthogonality error. This error is defined as the angle error between the zero crossing of the cosine output and maximum value of the sine outputs.

The hysteresis error (ANG_hyst) refers to the largest angle error difference between a clockwise rotation and a counter-clockwise rotation.

For the AMR sensor, the orthogonality error and the hysteresis errors are negligible.