AS5045-ASST datasheet(36/47 Pages) AMSCO

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[v2-01] 2017-Jul-13

AS5045 − Detailed Description

The AS5045 can compensate for this temperature related field

strength change automatically, no user adjustment is required.

Accuracy over Temperature :

The influence of temperature in the absolute accuracy is very

low. While the accuracy is

≤ ±0.5° at room temperature, it may

increase to

≤±0.9° due to increasing noise at high temperatures.

Timing Tolerance over Temperature: The internal RC oscillator

is factory trimmed to

±5%. Over temperature, this tolerance

may increase to

±10%. Generally, the timing tolerance has no

influence in the accuracy or resolution of the system, as it is

used mainly for internal clock generation. The only concern to

the user is the width of the PWM output pulse, which relates

directly to the timing tolerance of the internal oscillator. This

influence however can be cancelled by measuring the complete

PWM duty cycle instead of just the PWM pulse.

Differences Between AS5045 and AS5040

All parameters are similar for AS5045 and AS5040, except for

the parameters given below:

Figure 34:

Differences Between AS5045 and AS5040

Building Block

AS5045

AS5040

Resolution

12bits, 0.088°/step

10bit, 0.35°/step

Data length

Read: 18bits

(12bits data + 6 bits status)

OTP write: 18 bits

(12bits zero position + 6 bits mode

selection)

Read: 16bits

(10bits data + 6 bits status)

OTP write: 16 bits

(10bits zero position + 6 bits mode

selection)

Incremental signals

Not used

Pin 3: not used

Pin 4: not used

Quadrature, step/direction and BLDC

motor commutation modes

Pin 3: incremental output A_LSB_U

Pin 4: incremental output B_DIR_V

Pins 1 and 2

MagINCn, MagDECn: same feature as

AS5040, additional OTP option for

red-yellow-green magnetic range

MagINCn, MagDECn indicate in-range or

out-of-range magnetic field plus

movement of magnet in z-axis

Pin 6

MODE pin, switch between fast and slow

mode

Pin 6: Index output

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