參數(shù)資料
型號(hào)： NSE-5310
廠商： AUSTRIAMICROSYSTEMS AG
元件分類： 線性位移傳感器
英文描述： 0,488μm/step (I2C, PWM)
文件頁(yè)數(shù)： 14/22頁(yè)
文件大?。?/td> 431K
代理商： NSE-5310
www.ams.com
Revision 1.5
14 - 22
NSE-5310
Datasheet - Application Information
8.5 Z-axis Range Indication (“Red/Yellow/Green” Indicator)
The NSE-5310 provides several options of detecting the magnet distance by indicating the strength of the magnetic field. Signal indicators
MagINCn and MagDECn are available both as hardware pins (pins 2 and 3) and as status bits in the serial data stream
(see Figure 9)
.
Additionally the LIN status bit indicates the non-recommended “red” range.
The digital status bits MagINC, MagDec, LIN and the hardware pins MagINCn, MagDECn have the following function:
8.6 Pulse Width Modulation (PWM) Output
The NSE-5310 also provides a pulse width modulated output (PWM), whose duty cycle is proportional to the relative linear position of the
magnet within one pole pair (2.0 mm). This cycle repeats after every subsequent pole pair:
(EQ 1)
Where:
Digital position = 0 – 4094
Exception: A linear position of 1999.5μm = digital position 4095 will generate a pulse width of t
ON
= 4097μs and a pause t
OFF
= 1μs
The PWM frequency is internally trimmed to an accuracy of ±5% (±10% over full temperature range). This tolerance can be cancelled by
measuring the complete duty cycle as shown above.
Operating Conditions:
T
AMB
= -40 to +125oC, VDD5V = 3.0~3.6V (3V operation) VDD5V = 4.5~5.5V (5V operation) unless otherwise noted.
Table 12. PWMOutput Timng Considerations
Table 11. Magnetic Field Strength Red-Yellow-Green Indicators
Status Bits
MAG
Hardware Pins
Mag
INC
Mag
DEC
Lin
M11…
M0
Mag
INCn
Mag
DECn
Description
0
0
0
3F hex
OFF
OFF
No distance change
Magnetic input field OK (GREEN range, ~10-40mT peak amplitude)
0
1
0
3F hex
OFF
OFF
Distance increase; this state is a dynamic state and only active while the
magnet is moving away from the chip. Magnitude register may change
but regulates back to 3F hex.
1
0
0
3F hex
OFF
OFF
Distance decrease; this state is a dynamic state and only active while the
magnet is moving towards the chip. Magnitude register may change but
regulates back to 3F hex.
1
1
0
20 hex - 5F
hex
ON
OFF
YELLOW range: magnetic field is ~3.4-4.5mT.
The device may still be operated in this range, but with slightly reduced
accuracy.
1
1
1
<20 hex
>5F hex
ON
ON
RED range: magnetic field is <3.4mT (MAG <20) or >54.5mT
(MAG >5F). It is still possible to operate the device in the red range, but
not recommended.
Symbol
Parameter
Conditions
Mn
Typ
Max
Units
f
PWM
PWM frequency
Signal period = 4098μs ±5% at
T
AMB
=25oC
232
244
256
Hz
= 4098μs ±10% at
T
AMB
= -40 to +125oC
220
244
268
PW
MIN
Minimum pulse width
Position 0d = 0μm
0.9
1
1.1
μs
PW
MAX
Maximum pulse width
Position 4095d = 1999.5μm
3892
4097
4301
μs
Position
t
4098
t
on
+
(
t
off
)
------------------------
=
1
–
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