Texas Instruments TMAG5123EVM User manual

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TMAG5123EVM
User's Guide
SLYU056–June 2020
TMAG5123EVM
This user’s guide describes the characteristics, operation, and use of the TMAG5123 high-precision, in-
plane switch evaluation module (EVM). This EVM is designed to evaluate the performance of the
TMAG5123. This document includes a schematic, printed-circuit board (PCB) layouts, and a complete bill
of materials (BOM).

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TMAG5123EVM
Contents
1 Overview...................................................................................................................... 3
2 TMAG5123EVM Hardware ................................................................................................. 3
3 Quick Start Setup and Use ................................................................................................. 4
4 TMAG5123EVM Circuit ..................................................................................................... 5
5 TMAG5123EVM Schematic and PCB Layout............................................................................ 6
6 Bill of Materials............................................................................................................... 8
List of Figures
1 TMAG5123EVM Schematic ................................................................................................ 6
2 TMAG5123EVM Top Overlay.............................................................................................. 7
3 TMAG5123EVM Top Copper .............................................................................................. 7
4 TMAG5123EVM Bottom Copper .......................................................................................... 7
5 TMAG5123EVM Bottom Overlay ......................................................................................... 7
List of Tables
1 Device Variants ............................................................................................................. 3
2 TMAG5123EVM Kit Contents.............................................................................................. 3
3 Related Documentation..................................................................................................... 3
4 TMAG5123EVM Bill of Materials .......................................................................................... 8
Trademarks
All trademarks are the property of their respective owners.

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TMAG5123EVM
1 Overview
The TMAG5123 is a family of high-precision, wide input voltage, in-plane Hall effect sensors designed for
system challenges where higher magnetic precision is needed for more flexibility in design. The
TMAG5123 evaluation module is populated with a Sensata 499-P36-20 test socket, which allows for
convenient testing of all variants of the TMAG5123 family. Each device variant exhibits a different
magnetic sensitivity, allowing utility for distance measurement in application. When the applied magnetic
flux density exceeds the magnetic operating point (BOP) threshold, the device output drives into low voltage
state. When the magnetic flux density returns to a value below the magnetic release point (BRP), the
device output returns itself to a high voltage state. The TMAG5123EVM comes prepopulated with a
TMAG5123B1 variant for out of the box evaluation. Additional variants can be sampled from www.ti.com.
Table 1 lists the different device variants available.
Table 1. Device Variants
DEVICE BOP SENSITIVITY (MIN) BOP SENSITIVITY (MAX)
TMAG5123A1 1 mT 3 mT
TMAG5123B1 2.5 mT 4.5 mT
TMAG5123C1 6 mT 8 mT
TMAG5123D1 9 mT 11 mT
The device operates from a VCC range of 2.5 V to 38 V, and is available in a standard SOT-23 package.
1.1 TMAG5123EVM Kit Contents
Table 2 lists the contents of the TMAG5123EVM kit. Contact the nearest Texas Instruments Product
Information Center if any component is missing. TI highly recommends checking the TMAG5123 family
product folder on the TI website at www.ti.com for further information regarding this product.
Table 2. TMAG5123EVM Kit Contents
ITEM QUANTITY
TMAG5123EVM test board 1
Handheld magnet (D3X8) 1
USB-Micro Cable 1
1.2 Related Documentation From Texas Instruments
The following document provides information regarding TI's integrated circuits used in the assembly of the
TMAG5123EVM. This user's guide is available from the TI website under literature number SLYU056. Any
letter appended to the literature number corresponds to the document revision that is current at the time of
the writing of this document. Newer revisions are available from www.ti.com or the Texas Instruments'
Literature Response Center at [phone] or the Product Information Center at [phone]. When
ordering, identify the document by both title and literature number.
Table 3. Related Documentation
DOCUMENT LITERATURE NUMBER
TMAG5123 product data sheet SLYS030
2 TMAG5123EVM Hardware
The TMAG5123EVM is a simple-to-use platform for evaluating the main features and performance of the
TMAG5123 across a wide voltage range. The EVM provides quick visual feedback to the user in the form
of LED indication when the device under test's BOP or BRP thresholds are crossed.

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TMAG5123EVM
2.1 Features
The layout of the TMAG5123EVM printed-circuit board (PCB) is designed to provide the following
features:
• Burn-in test socket and precision 3D printed cradle for precise distance evaluation of in-plane sensors
• Provides LED feedback to the user to quickly determine output state from the TMAG5123
• Conveniently powered from a common micro-USB connector for quick prototyping
3 Quick Start Setup and Use
The following instructions are to set up and use the TMAG5123EVM:
1. Power up the EVM using either of the following methods:
a. USB power:
i. Insert the micro USB cable into the EVM onboard USB receptacle J1.
ii. Plug the USB cable into any USB power source (for example: laptop, desktop, power bank,
and so forth).
b. Variable power supply
i. Set the power supply voltage to desired setting between 2.5 V and 38 V. Do not turn on the
power yet.
ii. Connect the power supply V– terminal to the black GND test point on the EVM.
iii. Connect the power supply V+ terminal to the red VCC test point on the EVM.
iv. Turn on the power supply.
3.1 Measurements
The TMAG5123EVM enables the user to evaluate the functionality of the TMAG5123 Hall-effect sensor
using either a common USB-micro connector or external power supply, which must first be setup as
described in Section 3.
The following test procedures are to be used for both USB and external power options.
Step 1. Trigger the TMAG5123 device output: Slide either the north or south pole of the included
D3X8 magnet along the measurement channel of the TMAG5123 Hall-effect sensor.
Step 2. Observe the output: If using the onboard hardware, observe the indicator light D1 illuminate
when the magnet gets close to the Hall-effect sensor. Alternatively, measurement can also be
made through a voltage drop using an external voltage measuring device, such as an
oscilloscope or digital multimeter (DMM).

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TMAG5123EVM
4 TMAG5123EVM Circuit
This section summarizes the TMAG5123EVM components.
4.1 Micro-USB Receptacle
J1 is standard micro-USB receptacle. This receptacle provides 5-V power to the board if being used.
4.2 Test Socket
XU1 is a 499-P36-20 Sensata test socket, which is made for devices in a SOT-23 package, such as the
TMAG5123. This socket allows for quick and easy transition between variants of the TMAG5123.
4.3 LED Control
R1 functions as a pullup resistor for the open-drain output of the TMAG5123.
R2 is a current-limiting resistor to control the output intensity of the signal diode D1.
While not normally populated, C3 is an optional SMT pad for capacitor placement, forming a first-order low
pass filter with the pullup resistor.

1
2
3
XU1
499-P36-20
VBUS 1
D- 2
D+ 3
ID 4
GND 5
6
7
8
11 10
9
VCC
GND
2
1
2.00k
R2
10.0k
R1
100nF
50V
C2
GND
GND
GND
100nF
50V
C1
VCC
VCC
GND
VCC
GND
VCC
OUT
GND
100V
100pF
C3
DNP
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TMAG5123EVM
5 TMAG5123EVM Schematic and PCB Layout
NOTE: Board layouts are not to scale. These figures are intended to show the board layout. The
figures are not intended to be used for manufacturing TMAG5123EVM PCBs.
5.1 Schematic
Figure 1 shows the schematic for the TMAG5123EVM PCB.
Figure 1. TMAG5123EVM Schematic

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TMAG5123EVM
5.2 PCB Layout
Figure 2 through Figure 5 illustrate the PCB layout for the TMAG5123EVM.
Figure 2. TMAG5123EVM Top Overlay Figure 3. TMAG5123EVM Top Copper
Figure 4. TMAG5123EVM Bottom Copper Figure 5. TMAG5123EVM Bottom Overlay

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TMAG5123EVM
6 Bill of Materials
Table 4 provides the parts list for the TMAG5123EVM.
Table 4. TMAG5123EVM Bill of Materials
DESIGNATOR QTY VALUE DESCRIPTION PACKAGE
REFERENCE PART NUMBER MANUFACTURER ALTERNATE PART NUMBER ALTERNATE MANUFACTURER
C1, C2 2 0.1uF CAP, CERM, 0.1 uF, 50 V, +/- 10%, X7R, 0603 0603 C1608X7R1H104K080AA TDK
D1 1 Blue LED, Blue, SMD LED_0805 150080BS75000 Wurth Elektronik
H9,H10,H11,H12 4 Bumpon, Hemisphere, 0.44 X 0.20, Clear Transparent Bumpon SJ-5303 (CLEAR) 3M
J1 1 Connector, Receptacle, Micro-USB Type B, R/A,
Bottom Mount SMT MICRO USB CONN, R/A 1981568-1 TE Connectivity
MAG1 1 Magnet, N42, 3/16" Diameter, 1.5" Thickness D3X8 KJMagnetics
R1 1 10.0k RES, 10.0 k, 1%, 0.125 W, AEC-Q200 Grade 0,
0805 0805 CRCW080510K0FKEA Vishay-Dale
R2 1 2.00k RES, 2.00 k, 1%, 0.125 W, AEC-Q200 Grade 0,
0805 0805 CRCW08052K00FKEA Vishay-Dale
TP1 1 Test Point, Compact, Red, TH Red Compact Testpoint 5005 Keystone
TP2 1 Test Point, Compact, Black, TH Black Compact
Testpoint 5006 Keystone
TP3, TP4, TP5 3 Test Point, Miniature, SMT Testpoint_Keystone_Mi
niature 5015 Keystone
U1 1 Precision In-Plane Digital-Switch Hall-effect Sensor,
DBZ0003A DBZ0003A TMAG5123B1 Texas Instruments
XU1 1 Socket, SOT23-3 Socket, 910x520x450
mil 499-P36-20 Sensata/Wells-CTI
C3 0 100pF ±10% 100V Ceramic Capacitor X7R 0805
(2012 Metric) 0805 885012207110 Wurth Electronics

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