Rainbow Electronics MAX9621 User Manual

19-5024; Rev 0; 11/09

EVALUATION KIT

AVAILABLE

Dual, 2-Wire Hall-Effect Sensor Interface with

Analog and Digital Outputs

General Description

The MAX9621 is a continuation of the Maxim family of Hall-effect sensor interfaces that already includes the MAX9921. The MAX9621 provides a single-chip solution to interface two 2-wire Hall-effect sensors to low-voltage microprocessors (FP) through either a digital output for Hall-effect switches or an analog output for linear information or both.

The MAX9621 protects the Hall sensors from supply transients up to 60V at the BAT supply. Normal operating supply voltage ranges from 5.5V to 18V. If the BAT supply rises above 18V, the MAX9621 shuts off the current to the Hall sensors. When a short-to-ground fault condition is detected, the current to the Hall input is shut off and the condition is indicated at the analog output by a zerocurrent level and a high digital output.

The MAX9621 provides a minimum of 50Fs blanking time following Hall sensor power-up or restart. The opendrain digital outputs are compatible with logic levels up to 5.5V.

The MAX9621 is available in a 3mm x 5mm, 10-pin FMAXM package and is rated for operation in the -40NC to +125NC temperature range.

Applications

Window Lifters

Seat Movers

Electric Sunroofs

Seatbelt Buckles

Door Power Locks

Ignition Key

Steering Column

Speed Sensing

Features

S Provides Supply Current and Interfaces to Two

2-Wire Hall-Effect Sensors

S 5.5V to 18V Operating Voltage Range

S Protects Hall Sensors Against Up to 60V Supply

Transients

S Low-Power Shutdown for Power Saving

S Filtered Digital Outputs

S Analog Output Mirrors the Hall Sensor Current

S Hall Inputs Protected from Short to Ground

S Hall Sensor Blanking Following Power-Up and

Restart from Shutdown and Short to Ground

S Operates with ±3V Ground Shift Between the Hall

Sensor and the MAX9621

S ±2kV Human Body Model ESD and ±200V Machine

Model ESD at All Pins

S 3mm x 5mm, 10-Pin µMAX Package

Ordering Information

PART TEMP RANGE PIN-PACKAGE

MAX9621AUB+T

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

-40NC to +125NC 10 FMAX

Functional Diagram

BAT

ISET

REFERENCE

IN1

REF

BAT

SLEEP-MODE

CONTROL

REF

FILTER

10k

MAX9621

SLEEP

AOUT1 DOUT1

BAT

MAX9621

AOUT2 DOUT2

REF

FILTER

GND

Typical Application Circuit appears at end of data sheet.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

_______________________________________________________________ Maxim Integrated Products 1

INPUT

SHORT

DETECTION

IN2

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Dual, 2-Wire Hall-Effect Sensor Interface with Analog and Digital Outputs

ABSOLUTE MAXIMUM RATINGS

BAT to GND ...........................................................-0.3V to +60V

ISET to BAT ..........................................................-2.0V to +0.3V

IN1, IN2 to GND ................ -3V to lower of +60V or (V

AOUT1, DOUT1, AOUT2, DOUT2,

SLEEP to GND .....................................................-0.3V to +6V

Short-Circuit Duration AOUT1, DOUT1, AOUT2, DOUT2 to GND

or to 5.5V (individually) .......................................Continuous

MAX9621

Current In to IN1, IN2 .................................................... ±100mA

Current In to Any Other Pin ............................................. ±20mA

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

BAT

+ 1V)

DC ELECTRICAL CHARACTERISTICS

= 13.6V, V

BAT

GND at AOUT1 and AOUT2, unless otherwise noted, TA = -40NC to +125NC. Typical values are at TA = +25NC.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

GENERAL

BAT Supply Range V

BAT Supply Current

Hall Input Voltage Dropout V

ESD Protection

INPUT THRESHOLDS FOR DOUT1, DOUT2 SWITCHING

Input Current for Output High (Note 2)

Input Current for Output Low (Note 2)

Input Current Hysteresis for High/Low Detection

Channel-to-Channel Input Threshold Variation

Short-Circuit Current Limit I

AOUT1, AOUT2 ANALOG OUTPUTS

Current Gain for AOUT1 and AOUT2 Outputs

Current Gain Error for AOUT1 and AOUT2 Outputs

= 5V, IN1 = IN2 = no connection, R

SLEEP

BAT

IN_HYS

SET

Guaranteed by functional test of IIH, IIL, and G

Normal mode 1 mA V

= 0V

SLEEP

= 5.5V, at IN1 and IN2,

BAT

IIN = -14mA

= 5.5V, at IN1 and IN2,

BAT

IIN = -20mA

Machine Model

Human Body Model

= 95.3kI

SET

= 52.3kI

SET

= 95.3kI

SET

= 52.3kI

SET

Peak-to-peak as percent of average high/ low threshold (Note 2)

High threshold 0.02 Low threshold 0.02

A short to GND is not a sustained condition, Hall input reverts to -50FA when detected (Note 2)

-18mA P IIN P -2mA

IIN = -5mA, -14mA 0.2

Continuous Power Dissipation for a Single-Layer Board (TA = +70NC)

10-Pin µMAX (derate 5.6mW/NC) above +70NC........ 444.4mW

Continuous Power Dissipation for a Multilayer Board (TA = +70NC)

10-Pin µMAX (derate 8.8mW/NC) above +70NC........ 707.3mW

Operating Temperature Range ........................ -40NC to +125NC

Junction Temperature .....................................................+150NC

Storage Temperature Range ............................ -65NC to +160NC

Lead Temperature (soldering, 10s) ................................+300NC

= 61.9kI to BAT, RPU = 10kI at DOUT1 and DOUT2, RL = 5kI to

5.5 18 V

1 10

0.59 1.26

0.86 1.86

±200

±2000

-7.7

-14

-5

-9

8 %

-20 mA

0.05 mA/mA

±1.7

Dual, 2-Wire Hall-Effect Sensor Interface with

Analog and Digital Outputs

DC ELECTRICAL CHARACTERISTICS (continued)

= 13.6V, V

BAT

GND at AOUT1 and AOUT2, unless otherwise noted, TA = -40NC to +125NC. Typical values are at TA = +25NC.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Referred Current Offset I

AOUT_ Dropout Voltage

AOUT_ Output Impedance 500

LOGIC I/O (DOUT1, DOUT2)

Output-Voltage Low DOUT1, DOUT2

Three-State Output Current DOUT1, DOUT2

SLEEP

Input-Voltage High V Input-Voltage Low V Input Resistance to GND R

AC TIMING CHARACTERISTICS

Shutdown Delay from SLEEP Low to IN_ Shutoff

IN_, Blanking Time at Hall Sensor Power-Up

IN_, Current Ramp Rate After Turn-On

Delay from IN_ to DOUT_ (Filter Delay)

Delay Difference Between Rising and Falling Edges of Both Channels

Delay Difference Between Channels

Maximum Frequency on Hall Inputs

Maximum Analog Output Current During Short-to-GND Fault

IN_ Pulse Length Rejected by Filter to DOUT_

= 5V, IN1 = IN2 = no connection, R

SLEEP

SHDN

RAMP

DEL

MAX

MAO

= 61.9kI to BAT, RPU = 10kI at DOUT1 and DOUT2, RL = 5kI to

SET

Inferred from measurements at IIN = -5mA, -14mA

= 5.5V,

BAT

for 5% current reduction

Sink current = 1mA 0.4 V

= 0V, 0V P V

SLEEP

IIH = -14mA to GND, time from SLEEP low to IN_ drop 500mV, CL = 20pF

IIH = -14mA to GND, time from V

= 500mV until DOUT_ high, CL =

IN_

20pF (Notes 2, 3)

IN_ = GND (Note 2) 3.6 5 6.7

From IIH to IIL or from IIL to IIH, CL = 20pF, Figure 1 (Note 2)

HALL-BYPASS

and IIL = -7.5mA, CL = 20pF

HALL-BYPASS

and IIL = -7.5mA, CL = 20pF

HALL-BYPASS

and IIL = -7.5mA, CL = 20pF (Note 2)

Figure 2 (Note 2) 7.8 11.5 14.6

= 0.01FF, IIH = -11.5mA

IIN = -14mA 0.85 1.6

IIN = -20mA 1.09 1.75

P 5V

DOUT_

-120 +120

±1

2.0 V

0.8 V

50 100

33 40 46

76 89 103

10.8 13.5 16

500 ns

34 39 kHz

-1.4 mA

MAX9621

mA/Fs

Note 1: All DC specifications are 100% production tested at TA = +25°C. AC specifications are guaranteed by design at TA =

+25°C.

Note 2: Parameters that change with the value of the R Note 3: Following power-up or startup from sleep mode, the start of the blanking period is delayed 20Fs.

resistor: IIH, IIL, I

SET

IN_HYS

, ISC, tBL, t

RAMP

, t

, f

MAX

, and PR.

DEL

Dual, 2-Wire Hall-Effect Sensor Interface with Analog and Digital Outputs

Timing Diagrams

APPROXIMATELY 100mA

MAX9621

Figure 1. Timing Diagram

IN1

AOUT1

DOUT1

14mA

7mA

0mA

0.7mA

0.35mA

0mA

HALL SENSOR

OPEN

HALL SENSOR OPEN

DEL

SHORT CIRCUIT APPROXIMATELY 100mA

5mA/µs

APPROXIMATELY 1.4mA

RESTART

5mA/µs

DEL

IN_

DOUT_

Figure 2. Hall Input Pulse Rejection

14mA

7mA

0mA

DEL

Dual, 2-Wire Hall-Effect Sensor Interface with

Analog and Digital Outputs

Typical Operating Characteristics

= 13.6V, R

BAT

= 61.9kI, RL = 5kI to GND at AOUT_, V

SET

= 5V, TA = +25NC, unless otherwise noted.)

SLEEP

MAX9621

BAT SUPPLY CURRENT

vs. V

IN OPERATING MODE

0.9

0.8

0.7

0.6

BAT CURRENT (mA)

0.5

0.4

19.0 21.0

BAT

TA = -40NC

BAT VOLTAGE (V)

BAT SUPPLY CURRENT

vs. V

IN OPERATING MODE

1.0

0.8

0.6

BAT CURRENT (mA)

0.4

BAT

TA = -40NC

BAT SUPPLY CURRENT

vs. V

IN OPERATING MODE

0.9

MAX9621 toc01

0.8

0.7

0.6

BAT CURRENT (mA)

0.5

0.4

20.520.019.5

19.0 21.0

BAT

TA = +25NC

20.520.019.5

BAT VOLTAGE (V)

MAX9621 toc02

BAT CURRENT (mA)

0.9

0.8

0.7

0.6

0.5

0.4

19.0 21.0

BAT SUPPLY CURRENT

vs. V

IN OPERATING MODE

= +25NC

BAT

1.0

MAX9621 toc05

0.8

0.6

BAT CURRENT (mA)

0.4

1.0

MAX9621 toc04

0.8

0.6

BAT CURRENT (mA)

0.4

BAT SUPPLY CURRENT

vs. V

IN OPERATING MODE

BAT

TA = +125NC

BAT VOLTAGE (V)

BAT SUPPLY CURRENT

vs. V

IN OPERATING MODE

BAT

TA = +125NC

MAX9621 toc03

20.520.019.5

MAX9621 toc06

0.2 0 60

BAT VOLTAGE (V)

BAT SUPPLY CURRENT

vs. V

IN SHUTDOWN MODE

200

180

160

140

120

100

BAT CURRENT (nA)

0 80

BAT

TA = +125°C

= +25°C AND -40°C

BAT VOLTAGE (V)

5040302010

0.2 0 60

BAT VOLTAGE (V)

5040302010

HALL INPUT CURRENT THRESHOLDS

FOR HIGH/LOW vs. TEMPERATURE

10.4

10.2

MAX9621 toc07

10.0

9.8

9.6

9.4

HALL INPUT CURRENT (mA)

9.2

9.0

604020

8.8

LOW TO HIGH

HIGH TO LOW

-40 125 TEMPERATURE (°C)

11095-25 -10 5 35 50 6520 80

0.2 0 60

10.50

10.25

MAX9621 toc08

10.00

9.75

9.50

9.25

HALL INPUT CURRENT (mA)

9.00

8.75

8.50

5.5 18.0

BAT VOLTAGE (V)

HALL INPUT CURRENT

THRESHOLDS vs. V

LOW TO HIGH

HIGH TO LOW

BAT VOLTAGE (V)

5040302010

BAT

MAX9621 toc09

15.513.08.0 10.5

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