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MAX9926U Evaluation Kit

Evaluates: MAX9926U

General Description

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.

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.

Features

S Demonstrates the Operation of MAX9926U Modes

A1, A2, and B

S Evaluates Dual Differential and Single-Ended

Variable-Reluctance (VR or Magnetic Pickup)

Sensors

S Demonstrates Zero Crossing, Peak Detection,

Adaptive Threshold Mechanism, and Rotation

Direction

S Includes Lowpass Sensor Input Filters

S Evaluates 5Hz to 25kHz VR Sensors

S Fully Assembled and Tested

Ordering Information

Component List

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

19-4974; Rev 0; 9/09

PART TYPE

MAX9926UEVKIT+ EV Kit

DESIGNATION QTY DESCRIPTION

C1, C7 0

Not installed, ceramic capacitors

(0805)

C2 1

4.7FF Q20%, 25V X7R ceramic

capacitor (1206)

Murata GCM31CR71E475M

C3, C10, C11 3

0.1FF Q10%, 50V X7R ceramic

capacitors (0805)

Murata GCM21BR71H104K

C4, C6, C9 3

1FF Q10%, 16V X7R ceramic

capacitors (0805)

Murata GCM219R71C105K

C8 1

0.1FF Q10%, 16V X7R ceramic

capacitor (0603)

Murata GCM188R71C104K

R1–R4,

R14–R17

4.99kI Q1% resistors (1206)

Panasonic ERJ-8ENF4991V

R5, R6,

R18, R19

0 Not installed, resistors (0805)

DESIGNATION QTY DESCRIPTION

R10, R11 2

1kI Q1% resistors (0805)

R23, R28 2

10kI Q1% resistors (0805)

R24, R27, R29 3

10kI Q5% resistors (0805)

JU1, JU4,

JU7 JU10

4 2-pin headers

JU2, JU3, JU5,

JU6, JU8, JU9

6 3-pin headers

TP1, TP2,

TP5, TP6

4 Miniature PC test points, yellow

TP3, TP4 2 Miniature PC test points, red

TP7, TP8 2 PC test points, black

U1 1

VR sensor interface (16 QSOP)

Maxim MAX9926UAEE+

(Top Mark: +YWW)

— 10 Shunts (JU1–JU10)

— 1

PCB: MAX9926U EVALUATION

KIT+

Summary of content (7 pages)

PAGE 1
9-4974; Rev 0; 9/09 MAX9926U Evaluation Kit 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 differential or single-ended VR sensor signals and provides a gain of 1.
PAGE 2
Evaluates: MAX9926U MAX9926U Evaluation Kit Component Suppliers SUPPLIER PHONE Murata Electronics North America, Inc. WEBSITE 770-436-1300 www.murata-northamerica.com Panasonic Corp. 800-344-2112 www.panasonic.com Note: Indicate that you are using the MAX9926U when contacting these component suppliers. Quick Start • MAX9926U EV kit Required Equipment 6) Turn on the function generator and set it for an output of a DC offset of 2.5V DC, triangle wave with a frequency of 2.5kHz, and a 50% duty cycle.
PAGE 3
MAX9926U Evaluation Kit Additionally, PCB pads FILTER1 and FILTER2 are provided 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.
PAGE 4
Evaluates: MAX9926U 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; Mode B Operation: Supply a digital PWM signal to the respective channel FILTER_ and GND pads.
PAGE 5
MAX9926U Evaluation Kit Evaluates: MAX9926U Figure 1.
PAGE 6
Evaluates: MAX9926U MAX9926U Evaluation Kit 1.0’’ 1.0’’ Figure 2. MAX9926U EV Kit Component Placement Guide— Component Side Figure 3. MAX9926U EV Kit PCB Layout—Component Side 1.0’’ Figure 4.
PAGE 7
MAX9926U Evaluation Kit Figure 5. MAX9926U EV Kit PCB Layout—GND Layer 3 Evaluates: MAX9926U 1.0’’ 1.0’’ Figure 6. MAX9926U EV Kit PCB Layout—Solder Side 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.