3515 Datasheet PDF ( Pinout ) - RATIOMETRIC/ LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION

3515 Datasheet PDF - Allegro MicroSystems

Part Number	*3515*
Description	RATIOMETRIC/ LINEAR HALL-EFFECT SENSORS FOR HIGH-TEMPERATURE OPERATION
Manufacturers	Allegro MicroSystems
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3515 AND

3516

RATIOMETRIC, LINEAR HALL-EFFECT SENSORS

FOR HIGH-TEMPERATURE OPERATION

The A3515– and A3516– are sensitive, temperature-stable linear Hall-

effect sensors with greatly improved offset characteristics. Ratiometric, linear

Hall-effect sensors provide a voltage output that is proportional to the applied

magnetic field and have a quiescent output voltage that is approximately 50%

of the supply voltage. These magnetic sensors are ideal for use in linear and

rotary position sensing systems in the harsh environments of automotive and

industrial applications over extended temperatures to -40°C and +150°C. The

A3515– features an output sensitivity of 5 mV/G, while the A3516– has an

output sensitivity of 2.5 mV/G. See the Magnetic Characteristics table for

complete, individual device parametrics.

Each BiCMOS monolithic circuit integrates a Hall element, improved

temperature-compensating circuitry to reduce the intrinsic sensitivity drift of

the Hall element, a small-signal high-gain amplifier, and a rail-to-rail low-

impedance output stage.

Dwg. PH-006

Pinning is shown viewed from branded side.

A proprietary dynamic offset cancelation technique, with an internal

high-frequency clock, reduces the residual offset voltage, which is normally

caused by device overmolding, temperature dependancies, and thermal stress.

This technique produces devices that have an extremely stable quiescent

output voltage, are immune to mechanical stress, and have precise recover-

ability after temperature cycling. Many problems normally associated with

low-level analog signals are minimized by having the Hall element and

amplifier in a single chip. Output precision is obtained by internal gain and

offset trim adjustments during the manufacturing process.

These devices are supplied in a 3-pin ultra-mini-SIP ‘UA’ package.

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, VCC .............................. 8.0 V

Output Voltage, VO ................................ 8.0 V

Output Sink Current, IO ....................... 10 mA

Magnetic Flux Density, B .............. Unlimited

Package Power Dissipation,

PD ........................................... See Graph

Operating Temperature Range*, TA

Suffix ‘E–’ ..................... -40°C to +85°C

Suffix ‘L–’ .................... -40°C to +150°C

Storage Temperature Range,

TS .................................. -65°C to +170°C

* Infrequent excursions permitted; see

Applications Information.

FEATURES

I Temperature-Stable Quiescent Output Voltage

I Precise Recoverability After Temperature Cycling

I Output Voltage Proportional to Applied Magnetic Field

I Ratiometric Rail-to-Rail Output

I Improved Sensitivity

I 4.5 V to 5.5 V Operation

I Immune to Mechanical Stress

I Small Package Size

I Solid-State Reliability

Always order by complete part number, e.g., A3515LUA .

3515 AND 3516

RATIOMETRIC,

LINEAR

HALL-EFFECT SENSORS

CHARACTERISTICS DEFINITIONS

Quiescent Voltage Output. In the quiescent state (no mag-

netic field), the output is ideally equal to one-half of the supply

voltage over the operating voltage and temperature range (VOQ

∪ VCC/2). Due to internal component tolerances and thermal

considerations, there is a tolerance on the quiescent voltage

output and on the quiescent voltage output as a function of

supply voltage and ambient temperature. For purposes of

specification, the quiescent voltage output as a function of

temperature is defined as

∆VOQ(∆T)

VOQ(TA) – VOQ(25°C)

Sens(25°C)

(1)

This calculation yields the device’s equivalent accuracy,

over the operating temperature range, in gauss.

Sensitivity. The presence of a south-pole magnetic field

perpendicular to the package face (the branded surface) will

increase the output voltage from its quiescent value toward the

supply voltage rail by an amount proportional to the magnetic

field applied. Conversely, the application of a north pole will

decrease the output voltage from its quiescent value. This

proportionality is specified as the sensitivity of the device and

is defined as

Sens = VO(500G) – VO(-500G)

1000 G

(2)

The stability of sensitivity as a function of temperature is

defined as

∆Sens(∆T)

Sens(TA) – Sens(25°C)

Sens(25°C)

100%

(3)

Ratiometry. The A3515xUA and A3516xUA feature a

ratiometric output. The quiescent voltage output and sensitivity

are proportional to the supply voltage (ratiometric).

The per cent ratiometric change in the quiescent voltage

output is defined as

∆VOQ(∆V)

VOQ(VCC) / VOQ(5V)

VCC / 5 V

x 100%

(4)

and the per cent ratiometric change in sensitivity is defined as

∆Sens(∆V)

Sens(VCC)

VCC /

/ Sens(5V)

x 100%

(5)

Linearity and Symmetry. The on-chip output stage is de-

signed to provide a linear output to within 500 mV of either rail

with a supply voltage of 5 V. This is equivalent to approxi-

mately ±800 gauss of ambient field. Although application of

stronger magnetic fields will not damage these devices, it will

force the output into a non-linear region. Linearity in per cent

is measured and defined as

Lin+ = VO(500G) – VOQ x 100%

2 (VO(250G) – VOQ)

(6)

Lin– = VO(-500G) – VOQ x 100%

2 (VO(-250G) – VOQ)

and output symmetry as

(7)

Sym = VO(500G) – VOQ x 100%

VOQ – VO(-500G)

(8)

www.allegromicro.com

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