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A1365LKTTN-5-T Datasheet(PDF) 14 Page - Allegro MicroSystems

Part No. A1365LKTTN-5-T
Description  Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A1365LKTTN-5-T Datasheet(HTML) 14 Page - Allegro MicroSystems

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Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
With High-Bandwidth (120 kHz) Analog Output and Integrated Fault Comparator
A1365
14
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Figure 4: Delay to Clamp Definition
Figure 5: Quiescent Voltage Output Range Definition
V
t
Magnetic Input
VOUT
0
t1= time at which output voltage initially
reaches steady-state clamp voltage
t2= time at which output voltage settles to
steady-state clamp voltage ±1% of the
clamp voltage dynamic range, where
clamp voltage dynamic range =
VCLP(HIGH)(min) – VCLP(LOW)(max)
Note: Times apply to both high clamp
(shown) and low clamp.
VCLP(HIGH)
t1
t2
tCLP
VOUT(Q)PR(max)
value
VOUT(Q)PR(min)
value
VOUT(Q)
Typical initial value before
customer programming
VOUT(Q)init
(QVO programming
bits set to code 0)
Programming range
(specified limits)
Distribution of values
resulting from minimum
programming code
(QVO programming bits
set to decimal code 256)
Distribution of values
resulting from maximum
programming code
(QVO programming bits
set to decimal code 255)
Quiescent Voltage Output (VOUT(Q))
In the quiescent state (no significant magnetic field: B = 0 G),
the output (VOUT(Q)) has a constant ratio to the supply voltage
(VCC) throughout the entire operating ranges of VCC and ambient
temperature (TA).
Initial Unprogrammed Quiescent Voltage
Output (VOUT(Q)init )
Before any programming, the Quiescent Voltage Output
(VOUT(Q)) has a nominal value of VCC /2, as shown in Figure 5.
Quiescent Voltage Output Programming
Range (VOUT(Q)PR )
The Quiescent Voltage Output (VOUT(Q)) can be programmed
within the Quiescent Voltage Output Range limits: VOUT(Q)PR(min)
and VOUT(Q)PR(max). Exceeding the specified Quiescent Voltage
Output Range will cause Quiescent Voltage Output Drift Through
Temperature Range ΔVOUT(Q)TC to deteriorate beyond the speci-
fied values, as shown in Figure 5.
Average Quiescent Voltage Output Program-
ming Step Size (StepVOUT(Q))
The Average Quiescent Voltage Output Progamming Step Size
(StepVOUT(Q)) is determined using the following calculation:
VOUT(Q)maxcode – VOUT(Q)mincode
2n – 1
StepVOUT(Q) =
,
(1)
where n is the number of available programming bits in the trim range,
9 bits, VOUT(Q)maxcode is at decimal code 255, and VOUT(Q)mincode is at
decimal code 256.
Quiescent Voltage Output Programming
Resolution (ErrPGVOUT(Q))
The programming resolution for any device is half of its pro-
gramming step size. Therefore, the typical programming resolu-
tion will be:
ErrPGVOUT(Q)(typ) = 0.5 × StepVOUT(Q)(typ)
(2)
Quiescent Voltage Output Temperature Coef-
ficient (TCQVO)
Device VOUT(Q) changes as temperature changes, with respect to
its programmed Quiescent Voltage Output Temperature Coeffi-
cient, TCQVO. TCQVO is programmed at 150°C and is calculated
relative to the nominal VOUT(Q) programming temperature of
25°C. TCQVO (mV/°C) is defined as:
TCQVO = [VOUT(Q)T2 – VOUT(Q)T1][1/(T2 – T1)]
(3)
where T1 is the nominal VOUT(Q) programming temperature of
25°C, and T2 is the TCQVO programming temperature of 150°C.
The expected VOUT(Q) through the full ambient temperature range
(VOUT(Q)EXPECTED(TA)) is defined as:
VOUT(Q)EXPECTED(TA) = VOUT(Q)T1 + TCQVO(TA – T1)
(4)


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