MAX9926UEVKIT+ [MAXIM]

Includes Lowpass Sensor Input Filters;


型号：	MAX9926UEVKIT+
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Includes Lowpass Sensor Input Filters
文件：	总7页 (文件大小：1151K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-4974; Rev 0; 9/09

MAX9926U Evaluation Kit

General Description

Features

Sꢀ Demonstrates_the_Operation_of_MAX9926U_Modes_

The MAX9926U evaluation kit (EV kit) is a fully assembled

and tested circuit board that contains a dual-channel

differential variable-reluctance (VR or magnetic pickup)

sensor interface circuit using a MAX9926U IC in a 16-pin

QSOP package. The dual-channel interface circuit also

features differential amplifiers for evaluating a pair of dif-

ferential or single-ended VR sensor signals and provides

a gain of 1. Input power to the EV kit circuit can be sup-

plied by a 4.5V to 5.5V DC source. The MAX9926U IC

temperature range is -40NC to +125NC. The EV kit uses

automotive power-train safety-equipment-rated ceramic

capacitors with a temperature range of -55NC to +125NC.

A1,_A2,_and_B

Sꢀ Evaluates_Dual_Differential_and_Single-Ended_

Variable-Reluctance_(VR_or_Magnetic_Pickup)_

Sensors

Sꢀ Demonstrates_Zero_Crossing,_Peak_Detection,_

Adaptive_Threshold_Mechanism,_and_Rotation_

Direction

Sꢀ Includes_Lowpass_Sensor_Input_Filters

Sꢀ Evaluates_5Hz_to_25kHz_VR_Sensors

Sꢀ Fully_Assembled_and_Tested

The MAX9926U EV kit circuit can be configured to

demonstrate the MAX9926U IC’s operation with internal

adaptive peak threshold and zero-crossing detection

modes, as well as to interface to a microcontroller pulse-

width modulation (PWM) signal for evaluating external

thresholds. It can interface to both differential as well as

single-ended VR sensors. The EV kit can evaluate exter-

nal VR signals from 5Hz to 25kHz.

Ordering Information

PART

TYPE

MAX9926UEVKIT+

EV Kit

+Denotes lead(Pb)-free and RoHS compliant.

Component List

DESIGNATION

QTY

DESCRIPTION

DESIGNATION

R10, R11

QTY

DESCRIPTION

1kI Q1% resistors (0805)

10kI Q1% resistors (0805)

10kI Q5% resistors (0805)

Not installed, ceramic capacitors

(0805)

C1, C7

R23, R28

R24, R27, R29

4.7FF Q20%, 25V X7R ceramic

capacitor (1206)

Murata GCM31CR71E475M

C3, C10, C11

C4, C6, C9

JU1, JU4,

JU7 JU10

2-pin headers

JU2, JU3, JU5,

JU6, JU8, JU9

0.1FF Q10%, 50V X7R ceramic

capacitors (0805)

Murata GCM21BR71H104K

3-pin headers

TP1, TP2,

TP5, TP6

Miniature PC test points, yellow

1FF Q10%, 16V X7R ceramic

capacitors (0805)

Murata GCM219R71C105K

TP3, TP4

TP7, TP8

Miniature PC test points, red

PC test points, black

VR sensor interface (16 QSOP)

Maxim MAX9926UAEE+

(Top Mark: +YWW)

0.1FF Q10%, 16V X7R ceramic

capacitor (0603)

Murata GCM188R71C104K

—

10 Shunts (JU1–JU10)

R1–R4,

R14–R17

4.99kI Q1% resistors (1206)

Panasonic ERJ-8ENF4991V

PCB: MAX9926U EVALUATION

KIT+

R5, R6,

R18, R19

Not installed, resistors (0805)

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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.

MAX9926U Evaluation Kit

Component Suppliers

SUPPLIER

Murata Electronics North America, Inc.

Panasonic Corp.

PHONE

WEBSITE

770-436-1300

800-344-2112

www.murata-northamerica.com

www.panasonic.com

Note: Indicate that you are using the MAX9926U when contacting these component suppliers.

6) Turn on the function generator and set it for an output

Quick Start

Required Equipment

of a DC offset of 2.5V DC, triangle wave with a fre-

quency of 2.5kHz, and a 50% duty cycle.

• MAX9926U EV kit

• 5V, 100mA power supply

• Oscilloscope

7) The EV kit circuit is ready for further evaluation using

two VR or magnetic pickup sensors. See the Jumper

Selection section for configuring the EV kit circuit.

• Function generator

Detailed Description of Hardware

Procedure

The MAX9926U EV kit features a dual-channel differ-

ential VR sensor interface circuit using a MAX9926U IC

in a 16-pin QSOP surface-mount package. The EV kit’s

dual-channel interface circuit can evaluate signals from

differential or single-ended sensors. The interface circuit

provides a gain of 1 and can evaluate differential sensor

The MAX9926U EV kit is fully assembled and test-

ed. Follow the steps below to verify board operation.

Caution:_ Do_ not_ turn_ on_ the_ power_ supply_ until_ all_

connections_are_completed.

1) Verify that shunts are installed on their respective

jumper, as shown in Table 1.

signal amplitudes of 50mV

to 300V

with a 5Hz to

P-P

25kHz frequency range. Power for the EV kit circuit can

be supplied by a 4.5V to 5.5V DC source, which provides

at least 100mA.

2) Connect the 5V power supply to the VCC pad and the

power supply’s ground to the GND pad.

3) Turn on the power supply.

The MAX9926U EV kit circuit can be configured to dem-

onstrate the MAX9926U Modes A1, A2, or B operation.

Resistor-capacitor networks R10, R11, C4 provide a

VCC/2 source to the BIAS1 and BIAS2 inputs, respec-

tively, for evaluating Mode B. Refer to the Mode Selection

section in the MAX9926U IC data sheet for additional

4) Using the oscilloscope, measure the signal at the

COUT1 or COUT2 and GND pads, which should be a

2.5kHz square waveform with amplitude of 5V.

5) Connect the function generator to the SENSE1+ and

SENSE1- PCB pads.

Table_1._Default_Jumper_Configuration_(JU1–JU10)

JUMPER_

SHUNT_POSITION

JUMPER_CONFIGURATION

JU1

Installed

1-2

Channel 1, single-ended sensor

JU2

Channel 1, Mode A1 mode of operation

Channel 2, Mode A1 mode of operation

Channel 2, single-ended sensor

JU3

1-2

JU4

Installed

1-2

JU5

Channel 1, Mode A1 mode of operation

Mode A1 mode of operation

JU6

1-2

JU7

Not installed

1-2

JU8

Channel 2, Mode A1 mode of operation

V_PULL VCC powered

JU9

1-2

JU10

Installed

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MAX9926U Evaluation Kit

information on the modes of operation. Lowpass sensor

input filtering for channel 1 SENSE1Q inputs is provided

by resistors-capacitor network R1–R4, C1 and channel

2 SENSE2Q inputs are provided by R14–R17, C7. PCB

pads provide access to the MAX9926U square-wave

open-drain output signals at COUT1 and COUT2 and

the direction signals. These outputs are pulled up to the

V_PULL voltage and are configurable by jumper JU10.

after passing through resistors R1–R4. TP5 and TP6

provide access to the SENSE2+/SENSE2- input signals

after passing through resistors R14–R17. TP3 and TP4

provide access to the BIAS1 and BIAS2 reference,

respectively, while TP7 and TP8 provide access to GND.

Jumper Selection

The MAX9926U EV kit features several jumpers to recon-

figure the sensor input type, pullup voltage, and the

interface circuit’s mode of operation.

Additionally, PCB pads FILTER1 and FILTER2 are pro-

vided for interfacing with user-supplied microcontroller

PWM signals when evaluating Mode B of the MAX9926U,

which enables the threshold voltage to be set externally.

For FILTER1, resistor-capacitor network R23, C10 and

for FILTER2, R28, C11 provide a lowpass filter for the

PWM input signals, respectively. Refer to the Adaptive

Peak Threshold section in the MAX9926U IC data sheet

for additional information.

Sensor Signal Sources

(SENSE1+/SENSE1-, SENSE2+/SENSE2-)

The sensor signals are applied to the EV kit’s channel 1

SENSE1+/SENSE1- and channel 2 SENSE2+/SENSE2-

PCB pads. For proper operation, the typical differential

sensor signal should have 50mV

to 300V

and

P-P

a 5Hz to 25kHz frequency range. When evaluating

single-ended sensors, resistors R1–R4 and R14–R17

require replacement for operation at higher voltages and

power. Table 2 lists SENSE1+/SENSE1- various jumper

options for selecting the signal source and Table 3 lists

SENSE2+/SENSE2- jumper options.

When fed a 5Hz signal, the EV kit circuit can be used to

demonstrate the MAX9926U’s internal watchdog timer’s

functionality.

The EV kit also features test points to ease evaluating

the raw sensor input signals. Tests points TP1 and TP2

provide access to the SENSE1+/SENSE1- input signals

Table_2._Channel_1_SENSE1+/SENSE1-_Source_(JU1_Configuration)

SHUNT_

POSITION

IN1+_PIN

IN1-_PIN

SENSE1+/SENSE1-_SOURCE

External differential VR sensor

External single-ended VR sensor

Connected to SENSE1+ PCB pad

through resistors R1 and R2

Connected to SENSE1- PCB pad

through resistors R3 and R4

Not installed

Connected to SENSE1+ PCB pad

through resistors R1 and R2

Connects SENSE1- PCB pad to

GND pad

Installed

Table_3._Channel_2_SENSE2+/SENSE2-_Source_(JU4_Configuration)

SHUNT_

POSITION

IN2+_PIN

IN2-_PIN

SENSE2+/SENSE2-_SOURCE

External differential VR sensor

External single-ended VR sensor

Connected to SENSE2+ PCB pad

through resistors R14 and R15

Connected to SENSE2- PCB pad

through resistors R16, R17

Not installed

Connected to SENSE2+ PCB pad

through resistors R14 and R15

Connects SENSE2- PCB pad to

GND pad

Installed

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MAX9926U Evaluation Kit

MAX9926U Mode A1, A2, and B Operation

The MAX9926U EV kit features jumpers to configure the

respective channel 1 and channel 2 VR sensor interface

circuit mode of operation. The circuit can be configured

for Mode A1, A2, or B operation. For channel 1, Table 4

lists the various jumper options for configuring the circuit.

Table 5 lists channel 2 options;

COUT1, COUT2, DIRN Outputs and V_PULL

The MAX9926U open-drain comparator outputs are

available at the COUT1, COUT2, and DIRN PCB pads.

The V_PULL PCB pad is provided to pull up the COUT1,

COUT2, and DIRN signals (R24, R29, and R27, respec-

tively) to the voltage connected to the V_PULL PCB pad.

V_PULL can accept voltages up to 5.5V after removing

jumper JU10. When installed, jumper JU10 pulls the

V_PULL pads up to VCC.

Mode_B_Operation: Supply a digital PWM signal to the

respective channel FILTER_ and GND pads. The signal

must provide a 5V logic-high frequency in the 25kHz to

100kHz range.

Refer to the Mode Selection section in the MAX9926U IC

data sheet for additional information on selecting a mode

of operation.

Table_4._Channel_1_Mode_A1,_A2,_and_B_(JU1,_JU2,_JU5,_JU6,_JU7_Configuration)

SHUNT_POSITION

MODE

JU1

JU2

JU5

JU6

JU7

SENSOR

BIAS1

INTꢀTHRS1

EXT1

ZEROꢀEN

See Table 2

1-2

2-3

1-2

2-3

1-2

1-3

Not installed

Installed

Not installed

Table_5._Channel_2_Mode_A1,_A2,_and_B_(JU3,_JU4,_JU7,_JU8,_JU9_Configuration)

SHUNT_POSITION

MODE

JU4

JU3

JU8

JU9

JU7

SENSOR

BIAS2

INTꢀTHRS2

EXT2

ZEROꢀEN

See Table 3

1-2

2-3

1-2

2-3

1-2

1-3

Not installed

Installed

Not installed

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MAX9926U Evaluation Kit

Figure 1. MAX9926U EV Kit Schematic

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MAX9926U Evaluation Kit

1.0’’

Figure 3. MAX9926U EV Kit PCB Layout—Component Side

Figure 2. MAX9926U EV Kit Component Placement Guide—

Component Side

1.0’’

Figure 4. MAX9926U EV Kit PCB Layout—VCC Layer 2

6_ _ _ꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀꢀ

MAX9926U Evaluation Kit

1.0’’

Figure 6. MAX9926U EV Kit PCB Layout—Solder Side

Figure 5. MAX9926U EV Kit PCB Layout—GND Layer 3

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.

Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

2009 Maxim Integrated Products

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

MAX9926UEVKIT+ [MAXIM]

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