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NSE-5310
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
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:
Table 11. Magnetic Field Strength Red-Yellow-Green Indicators
Status Bits
MAG
Hardware Pins
Mag
INC
0
Mag
DEC
0
Lin
0
M11…
M0
3F hex
Mag
INCn
OFF
Mag
DECn
OFF
Description
No distance change
Magnetic input field OK (GREEN range, ~10-40mT peak amplitude)
Distance increase; this state is a dynamic state and only active while the
0
1
0
3F hex
OFF
OFF
magnet is moving away from the chip. Magnitude register may change
but regulates back to 3F hex.
Distance decrease; this state is a dynamic state and only active while the
1
0
0
3F hex
OFF
OFF
magnet is moving towards the chip. Magnitude register may change but
regulates back to 3F hex.
1
1
1
1
0
1
20 hex - 5F
hex
<20 hex
>5F hex
ON
ON
OFF
ON
YELLOW range: magnetic field is ~3.4-4.5mT.
The device may still be operated in this range, but with slightly reduced
accuracy.
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.
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:
t on ? 4098
( t on + t off )
Position = ------------------------ – 1
(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. PWM Output Timing Considerations
Symbol
f PWM
PW MIN
PW MAX
Parameter
PWM frequency
Minimum pulse width
Maximum pulse width
Conditions
Signal period = 4098μs ±5% at
T AMB =25oC
= 4098μs ±10% at
T AMB = -40 to +125oC
Position 0d = 0μm
Position 4095d = 1999.5μm
Min
232
220
0.9
3892
Typ
244
244
1
4097
Max
256
268
1.1
4301
Units
Hz
μs
μs
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