A1365LKTTN-5-T datasheet(14/32 Pages) ALLEGRO | Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC

14 / 32 page

Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC

With High-Bandwidth (120 kHz) Analog Output and Integrated Fault Comparator

A1365

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

Magnetic Input

VOUT

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)

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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