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AS5171 bảng dữ liệu(PDF) 25 Page - ams AG

tên linh kiện AS5171
Giải thích chi tiết về linh kiện  Accurate angle measurement
PDF  42 Pages
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nhà sản xuất  AMSCO [ams AG]
Trang chủ  http://www.ams.com
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AS5171 bảng dữ liệu(HTML) 25 Page - ams AG

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ams Datasheet
Page 25
[v1-01] 2016-Feb-17
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AS5171 − Register Description
The FBS setting allows selecting the failure band (lower or
upper) when the output goes into diagnostic mode.
Diagnostic Explanations
For a detailed explanation of the diagnostic and the SPFM
please contact the ams application team for magnetic position
sensor.
Analog Read Fail (SM11)
This safety mechanism operates differently for AS5171A
(analog) and AS5171B (digital):
• For AS5171B readout failure: After a falling edge there
must be a rising edge after a defined time.
In case this is not respected output driver is kept in high
impedance. After a certain time this condition is checked
again.
The readout mechanism for AS5171B is defined by PWMRTH
and PWMFTH, which set the maximum timeout period to wait
for a falling/rising before triggering an error condition,
according to the figures below.
Figure 32:
PWMRTH Conditions
SM8
VDD undervoltage
Yes, if the VDD is above the specified
threshold
Hi-z: Failure band related to the
out load
SM9
Broken VDD
Yes
Hi-z: Failure band related to the
out load
SM10
ADC check
No, sensor stays in failure band till the
Sensor is resetting.
Hi-z: Failure band related to the
out load
SM11
Analog read fail
Yes
Hi-z: Failure band related to the
out load
SM12
Short circuit
Yes
Hi-z: Failure band related to the
out load
SM13
Signature
No, sensor stays in failure band till the
sensor is resetting
Hi-z: Failure band related to the
out load
SM14
Broken GND
Yes
Hi-z: Failure band related to the
out load
PWMRTH
Delay (
μs)
0
0
PWM Read Back rise disabled
01
24-28
10
56-60
1
1
112-120
SM
Safety Mechanism
Recoverable
Safe State



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