A1185 데이터 시트보기 (PDF) - Allegro MicroSystems

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A1185

Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches

Allegro MicroSystems 

A1185 and

A1186

Ultrasensitive Two-Wire Field-Programmable

Chopper-Stabilized Unipolar Hall Effect Switches

ELECTRICAL CHARACTERISTICS over the operating voltage and temperature ranges, unless otherwise specified

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max. Units

Supply Voltage1

VCC Device powered on

3.5

–

24

V

Supply Current2

ICC(L)

ICC(H)

B >BOP for A1185; B <BRP for A1186

B >BOP for A1186; B <BRP for A1185

5

–

6.9

mA

12

–

17

mA

Supply Zener Clamp Voltage

VZSupply ICC = ICC(L)(Max) + 3 mA; TA = 25°C

28

–

40

V

Supply Zener Clamp Current3

IZSupply VSupply = 28 V

–

–

9.9

mA

Reverse Supply Current

Output Slew Rate4

IRCC

VRCC = –18 V

–

No bypass capacitor; capacitance of the

di/dt oscilloscope performing the measurement

–

= 20 pF

–

1.6

mA

36

–

mA/μs

Chopping Frequency

fC

–

200

–

kHz

Power-On Time5

ton

After factory trimming; with and without

bypass capacitor (CBYP = 0.01 μF)

–

–

25

μs

Power-On State6,7

POS

ton ≤ ton(max); VCC slew rate > 25 mV/μs

–

HIGH

–

–

1VCC represents the generated voltage between the VCC pin and the GND pin.

2Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic

polarity; therefore greater B values indicate a stronger south polarity field (or a weaker north polarity field, if present).

3IZSUPPLY(max) = ICCL(max) + 3 mA.

4Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change.

5Measured with and without bypass capacitor of 0.01 μF. Adding a larger bypass capacitor causes longer Power-On Time.

6POS is defined as true only with a VCC slew rate of 25 mV / μs or greater. Operation with a VCC slew rate less than 25 mV / μs can permanently harm

device performance.

7POS is undefined for t > ton or BRP < B < BOP .

MAGNETIC CHARACTERISTICS1 over the operating voltage and temperature ranges, unless otherwise specified

Characteristic

Programmable Operate Point Range

Initial Operate Point Range

Switchpoint Step Size2

Number of Programming Bits

Symbol

Test Conditions

BOPrange

BOPinit

ICC = ICC(L) for A1185

ICC = ICC(H) for A1186

VCC = 12 V

BRES VCC = 5 V, TA = 25°C

Switchpoint setting

–

Programming locking

Min.

Typ.

Max. Units

10

–

60

G

–

–10

10

G

2

4

6

G

–

5

–

Bit

–

1

–

Bit

Temperature Drift of BOP

ΔBOP

–

–

±20

G

Hysteresis

BHYS BHYS = BOP – BRP

5

15

30

G

1Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic

polarity; therefore greater B values indicate a stronger south polarity field (or a weaker north polarity field, if present).

2The range of values specified for BRES is a maximum, derived from the cumulative programming bit errors.

Allegro MicroSystems, Inc.

3

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

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