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General Description

The MAX9924U evaluation kit (EV kit) is a fully assem-

bled and tested PCB that contains a differential variable

reluctance (VR) sensor interface circuit using a

MAX9924U IC in a 10-pin µMAX

package. The single-

channel interface circuit also features a differential

amplifier for evaluating differential or single-ended VR

sensor (magnetic pickup sensor) signal, and provides a

fixed gain of 1V/V. Input power to the EV kit circuit can

be supplied by a 4.5V to 5.5V DC source. The

MAX9924U IC temperature range is -40°C to +125°C.

The MAX9924U EV kit circuit can be configured to

demonstrate the MAX9924U IC’s operation with internal

adaptive peak threshold and zero-crossing detection

modes. It can also interface to a microcontroller PWM

signal for evaluating external thresholds. Additionally, a

configurable on-board triangle-wave generator using a

MAX9000 IC provides a 5Hz, 55Hz, 2.5kHz, or 24kHz

triangle-wave signal if no external VR signal is available

for evaluation.

Features

♦ Demonstrates MAX9924U MODE A1, A2, B, and C

Operation

♦ Evaluates Differential and Single-Ended Sensors

(VR or Magnetic Pickup)

♦ Demonstrates Zero-Crossing and Adaptive

Threshold Mechanism

♦ Includes Lowpass Sensor Input Filter

♦ On-Board 5Hz/24kHz Triangle-Wave Generator

♦ Evaluates MAX9925 (IC Replacement Required)

♦ Lead(Pb)-Free and RoHS Compliant

♦ Fully Assembled and Tested

Evaluates: MAX9924U/MAX9925

MAX9924U Evaluation Kit

________________________________________________________________

Maxim Integrated Products

19-4377; Rev 0; 11/08

Component List

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.

Ordering Information

DESIGNATION QTY DESCRIPTION

C1 1

4.7µF ±20%, 25V X7R ceramic

capacitor (1206)

Murata GCM31CR71E475M

C2, C7, C8 3

0.1µF ±10%, 16V X7R ceramic

capacitors (0603)

Murata GCM188R71C104K

C3, C9 2

1µF ±10%, 16V X7R ceramic

capacitors (0805)

Murata GCM219R71C105K

C4, C10 2

0.1µF ±10%, 50V X7R ceramic

capacitors (0805)

Murata GCM21BR71H104K

C5 1

1000pF ±10%, 50V X7R ceramic

capacitor (0805)

Murata GCM216R71H102K

C6 1

220pF ±5%, 50V C0G ceramic

capacitor (0603)

Murata GCM1885C1H221J

JU1, JU3,

JU7–JU10

6 2-pin headers

DESIGNATION QTY DESCRIPTION

JU2, JU5 2 3-pin headers

JU4 1 4-pin header

JU6 0

Not installed, 2-pin header, 0.1in

centers

R1, R2,

R9–R12, R20,

R21

Not installed, resistors (0805)

R1, R2, R9–R12 are open;

R20, R21 are short (PC trace)

R3, R4 2 1kΩ ±1% resistors (0805)

R5–R8 4

4.99kΩ ±1% resistors (1206)

Panasonic ERJ-8ENF4991V

R13 1 10kΩ ±1% resistor (0805)

R14 1 10kΩ ±5% resistor (0805)

R15 1 54.9kΩ ±1% resistor (0805)

R16 1 464kΩ ±1% resistor (0805)

R17 1 100kΩ ±1% resistor (0805)

R18 1 68.1kΩ ±1% resistor (0805)

R19 1 39.2kΩ ±1% resistor (0805)

TP1, TP2 2 PC mini test points, yellow

PART TYPE

MAX9924UEVKIT+ EV Kit

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

Denotes lead(Pb)-free and RoHS compliant.

Summary of content (8 pages)

PAGE 1
9-4377; Rev 0; 11/08 MAX9924U Evaluation Kit The MAX9924U evaluation kit (EV kit) is a fully assembled and tested PCB that contains a differential variable reluctance (VR) sensor interface circuit using a MAX9924U IC in a 10-pin µMAX® package. The singlechannel interface circuit also features a differential amplifier for evaluating differential or single-ended VR sensor (magnetic pickup sensor) signal, and provides a fixed gain of 1V/V. Input power to the EV kit circuit can be supplied by a 4.5V to 5.
PAGE 2
Evaluates: MAX9924U/MAX9925 MAX9924U Evaluation Kit Component List (continued) DESIGNATION QTY TP3, TP5 2 PC mini test points, red DESCRIPTION TP4, TP6 2 PC test points, black U1 1 VR sensor interface (10 µMAX) Maxim MAX9924UAUB+ U2 1 High-speed op amp comparator reference (8 SO) Maxim MAX9000ESA+ — 9 Shunts (JU1–JU5, JU7–JU10) — 1 PCB: MAX9924U Evaluation Kit+ PHONE WEBSITE 770-436-1300 www.murata-northamerica.com Panasonic Corp. 800-344-2112 www.panasonic.
PAGE 3
MAX9924U Evaluation Kit Jumper Selection The MAX9924U EV kit features several jumpers to reconfigure the interface circuit’s mode of operation, sensor input type, and the triangle-wave generator frequency. Sensor Signal Source (IN+, IN-) The MAX9924U EV kit features jumpers to select the MAX9924U IC IN+ and IN- pin signal source, either the EV kit’s triangle-wave generator (U2) or a user-supplied sensor signal. The sensor signal is applied to the EV kit’s SENSE+ and SENSE- PCB pads.
PAGE 4
Evaluates: MAX9924U/MAX9925 MAX9924U Evaluation Kit Table 4. MODE A1, A2, B, and C Configuration (JU1–JU5, JU7) MODE JU1 (R1, R2) JU2 (BIAS) JU3 (ZERO_EN) JU4 (EXT) JU5 (INT_THRS) JU7 (SENSOR) A1 Open 1&2 Open 1-2 1-2 Installed* A1 A2 Open 2&3 Installed 1-2 2-3 Installed* A2 B Open 1&2 Open 1-3 2-3 Installed* B C Installed 1&2 Installed 1-4 2-3 Installed* C MODE *Open for a differential sensor or installed for singled-ended sensors or the triangle-wave generator.
PAGE 5
MAX9924U Evaluation Kit Evaluates: MAX9924U/MAX9925 Figure 1.
PAGE 6
Evaluates: MAX9924U/MAX9925 MAX9924U Evaluation Kit Figure 2.
PAGE 7
MAX9924U Evaluation Kit Evaluates: MAX9924U/MAX9925 Figure 3.
PAGE 8
Evaluates: MAX9924U/MAX9925 MAX9924U Evaluation Kit Figure 4. MAX9924U 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.