Texas Instruments TMAG5124EVM User manual

User’s Guide
TMAG5124EVM
ABSTRACT
This user’s guide describes the characteristics, operation, and use of the TMAG5124 2-wire evaluation module
(EVM). This EVM is designed to evaluate the performance of the TMAG5124 over a separation of distance using
current as the signal of interest. This document includes a schematic, printed-circuit board (PCB) layouts, and a
complete bill of materials (BOM).
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Table of Contents
1 Trademarks..............................................................................................................................................................................2
2 Overview..................................................................................................................................................................................3
2.1 TMAG5124EVM Kit Contents............................................................................................................................................ 3
2.2 Related Documentation From Texas Instruments.............................................................................................................. 3
3 Hardware................................................................................................................................................................................. 4
3.1 Features............................................................................................................................................................................. 4
4 Quick Start...............................................................................................................................................................................4
4.1 Option 1: Single 5-V Supply............................................................................................................................................... 4
4.2 Option 2: Separate VCC and 5-V Supply...........................................................................................................................4
4.3 Measurements................................................................................................................................................................... 5
4.4 Standalone Measurements................................................................................................................................................ 5
5 Circuitry................................................................................................................................................................................... 7
5.1 TMAG5124 Coupon Boards...............................................................................................................................................7
5.2 Logic, Feedback, and Display............................................................................................................................................ 7
5.3 J5........................................................................................................................................................................................7
6 Schematic, PCB Layout, and Bill of Materials......................................................................................................................8
6.1 Schematic.......................................................................................................................................................................... 8
6.2 PCB Layout........................................................................................................................................................................ 9
6.3 Bill of Materials.................................................................................................................................................................10
7 Revision History................................................................................................................................................................... 12
1 Trademarks
All trademarks are the property of their respective owners.
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2 Overview
The TMAG5124 is a family of 2-wire Hall Effect sensors designed for system challenges where current is needed
as an operating signal in place of voltage. This is most commonly found in applications where the Hall sensor is
located some distance from the microcontroller or processor that acts on the signal, and signal integrity is of
concern.
When the applied magnetic flux density exceeds the magnetic operating point (BOP) threshold, the device output
drives into a high or low current state, based on the device in use. When the magnetic flux density returns to a
value below the magnetic release point (BRP), the device output returns itself into a high or low current state,
based on the device in use. Table 2-1 lists device options.
Table 2-1. TMAG5124 Device Summary
Device BOP Sensitivity (typ.) Current (typ.), Low state
TMAG5124A1 4mT 4 mA
TMAG5124B1 6mT 4 mA
TMAG5124C1 10mT 4 mA
TMAG5124D1 15mT 4 mA
TMAG5124E1 4mT 6 mA
TMAG5124F1 6mT 6 mA
TMAG5124G1 10mT 6 mA
TMAG5124H1 15mT 6 mA
This evaluation module is populated with four Z-axis oriented, north pole sensitive, active low devices. Each
device exhibits a different sensitivity, allowing each of the sensitivities to be tested for use in an application.
These devices produce an active low signal of 5 mA – 6.9 mA when the BOP threshold is crossed, and a high
signal of 12 mA – 15 mA when no magnet is present.
The device operates from a VCC range of 2.5V to 38V, and is available in a standard SOT-23 package.
2.1 TMAG5124EVM Kit Contents
Table 2-2 lists the contents of the TMAG5124EVM kit. Contact the nearest Texas Instruments Product
Information Center if any component is missing. TI highly recommends checking the TMAG5124 family product
folder on the TI website at www.ti.com for further information regarding this product.
Table 2-2. TMAG5124 Kit Contents
Item Quantity
TMAG5124EVM test board 1
Handheld magnet (D2X8) 1
2.2 Related Documentation From Texas Instruments
The following document provides information regarding TI's integrated circuits used in the assembly of the
TMAG5124EVM. This user's guide is available from the TI website under literature number SLYU055. 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.
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Table 2-3. Related Documentation
Document Literature Number
TMAG5124 product data sheet SLYS016
3 Hardware
The TMAG5124EVM is a small form factor, simple-to-use platform for evaluating the main features and
performance of the TMAG5124 across a wide voltage range. The EVM features a separate control board that
uses the INA303-Q1 that provides instantaneous feedback to the user in the form of LED indication for ON and
OFF, and an ALERT state that indicates that the loop is no longer sensing current. The individual TMAG5124
devices are mounted on separable coupon boards, which allows for seamless transition to adapt one of these
devices into an existing system for rapid prototyping.
3.1 Features
The layout of the TMAG5124EVM printed-circuit board (PCB) is designed to provide the following features:
• Separates TMAG5124 and control board for testing over distance of wire
• Small form factor board for external testing and prototyping capability
• Provides LED feedback to the user to quickly determine output state from the TMAG5124
• External control board that provides visual output for the correlation of trip points
See the TMAG5124 data sheet (SLYS016) for comprehensive information about the TMAG5124 device.
4 Quick Start
4.1 Option 1: Single 5-V Supply
Follow the procedure listed below to set up and use the TMAG5124EVM with a single 5-V supply:
1. Ensure that plug J5 is shorted.
2. Connect an external 5-V DC supply voltage to the VCC connection point. Ensure the 5-V supply is powered
down for now.
3. Connect a wire from "VCC_OUT" on the control board to the "VCC_OUT" port of the TMAG5124 device to be
evaluated. Repeat this process for "GND."
4. Turn on the supply. The blue "OFF" light turns on. This indicates that the device is turned on, and current is
flowing through the loop.
5. Test the TMAG5124EVM as outlined in section Section 4.3 below.
4.2 Option 2: Separate VCC and 5-V Supply
Follow the procedure listed below to set up and use the TMAG5124EVM with dual supplies, which allows the full
VCC range of the TMAG5124 to be tested:
1. Ensure that the shorting plug on J5 is removed.
2. Connect an external 5-V DC supply voltage to the 5-V connection point. Ensure that the 5-V supply is
powered down for now.
3. Connect an external DC supply voltage to the VCC connection point, which sets the voltage to the desired
level. Ensure this supply is powered down for now.
4. Connect a wire from "VCC_OUT" on the control board to the "VCC_OUT" port of the TMAG5124 device to be
evaluated. Repeat this process for "GND."
5. Power on the supply. The blue "OFF" light turns on. This indicates that the device is turned on, and current is
flowing through the loop.
6. Test the TMAG5124EVM as outlined in Section 4.3 below.
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4.3 Measurements
Note
While TMAG5124 is capable of handling a VCC maximum of 38 V, the INA303-Q1 common mode
voltage range may not exceed 36 V to maintain linear operation. TI does not recommend using the
control board to evaluate the device inside the 36 V to 38 V range. Testing at this range does not
cause damage to either device, but the response from INA303 is not within data sheet specifications.
The TMAG5124EVM enables the user to test the functionality of the TMAG5124 Hall-effect sensor using the
onboard hardware or external hardware, which must first be set up as described in Section 4. Then, perform the
following:
1. Trigger the TMAG5124 device output: Lower the north pole of the included magnet directly over the
TMAG5124 Hall-effect sensor.
2. Observe the operating point: At the point the magnet crosses the BOP threshold, the "ON" LED (D1) turns
on, and the "OFF" LED (D2) turns off.
3. Observe the release point: Removing the magnet beyond the release point (BRP), the "ON" LED (D1) turns
off, and the "OFF" LED (D2) turns on.
4. Observe the ALERT state: Ensure all power supplies are off. Unplug "VCC_OUT" from the control board or
the coupon board under test, which "breaks" the loop. Re-energize the power supplies. When the device is
not capable of passing current, the control board "ALERT" diode (D3) turns on in place of the "OFF" or "ON"
signals.
4.4 Standalone Measurements
It is possible to set up and capture measurements with only a TMAG5124EVM coupon board. This allows testing
of the full VCC range of the TMAG5124:
1. Connect an external DC supply voltage to the VCC connection point on the EVM, which sets the voltage to
the desired level. Ensure that this supply is powered down for now.
2. Connect a wire from GND on the EVM to a selected resistor value.
3. Connect the remaining side of the resistor to the V- side of the external DC supply. When this is complete,
verify that the setup is as shown in Figure 4-1 below.
4. Power on the supply. Based on the selected resistor value, VSENSE changes with the corresponding change in
current by Equation 1 below.
V-V+
VCC Power Supply
+
-
VSENSE = ICC*R
ICC ICC
Figure 4-1. TMAG5124EVM Coupon Board Standalone Diagram
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VSENSE = ICC * R (1)
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5 Circuitry
This section summarizes the TMAG5124EVM subsystems and components.
5.1 TMAG5124 Coupon Boards
The coupon boards are designed to test the complete TMAG5124 family, including in-axis and TO-92 packaged
variants.
U1-U4 are TMAG5124E1CQDBZ, TMAG5124F1CQDBZ, TMAG5124G1CQDBZ, and TMAG5124H1CQDBZ
versions of the TMAG5124 respectively. These devices allow the user to test all sensitivities of the TMAG5124
(3mT, 6mT, 10mT, and 15mT), with an active low current of 6 mA when a magnet is present at the device. The
in-board measurement slot is for a future "in-plane" version of the device.
U5-U8 are for a future option of the device in TO-92 package.
C1-C8 serve as bypass capacitors for the various devices and help to mitigate noise on the power supply
supplied to the device.
5.2 Logic, Feedback, and Display
The control board portion of the TMAG5124EVM measures the current in the loop of the TMAG5124, and
provides one of three LED feedbacks to the user based on the measured state.
INA303-Q1 is a 36-V common-mode, bidirectional, voltage output current shunt amplifier with integrated window
comparator. The device is mainly used here for the window comparator feature, which allows the device to
measure three separate states. Current is measured across R1, a precision 3-Ω shunt resistor.
R2, R3, and C10 form a low pass filter for the inputs, as the signal of interest here is mainly a DC signal, and this
helps to remove noise on the common mode signal. Note that these resistors have bearing on the gain error of
the shunt amplifier, and TI recommends using a value of less than 10 Ω.
R4 and R5 set the limits of the comparator window. The TMAG5124 data sheet explains that for the populated
devices, a logic high corresponds to 6 mA, and a logic low corresponds to 12 mA. With this in mind, select
resistors using the formula from section 7.3.3.1.1 of the INA303 data sheet:
RLIMIT = ITRIP * RSENSE * GAIN + VREF
ILIMIT
(2)
RLOW = . 005 * 3 * 20
80 E - 06 = 3 . 75kΩ (3)
RHIGH = . 015 * 3 * 20
80 E - 06 = 11 . 25 kΩ (4)
Note that for the purposes of error margin, slightly smaller resistance values of 3 kΩ and 10.5 kΩ are used for R4
and R5, respectively.
5.3 J5
J5 is a shorting plug between the 5-V input and VCC input. By shorting this plug, the TMAG5124EVM is powered
from a single 5-V supply. If the user wants to evaluate VCC across the full range, ensure that this jumper is
removed.
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6 Schematic, PCB Layout, and Bill of Materials
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 TMAG5124EVM PCBs.
6.1 Schematic
Figure 6-1 shows the schematic for the TMAG5124EVM PCB
RMT_VCC1
RMT_VCC2
RMT_VCC3
RMT_VCC4
RMT_GND1
RMT_GND2
RMT_GND3
RMT_GND4
VS
1
OUT 2
LIMIT1 3
REF
4
GND 5
RES ET1 6
RES ET2 7
NC
8
LIMIT2 9
DELAY
10
ALERT2 11
ALERT1 12
IN-
13
IN+
14
INA303A1IP WR
U9
5V
TP2
5V
GND
10.0
R2
10.0
R3 1µF
C10
GND
10.0k
R7
10.0k
R9
VCC
243
R10
D2
D1
D3
4
1
2
SN74AHC1G08QDBVRQ1
U10A
VCC
5GND 3
SN74AHC1G08QDBVRQ1
U10B
GND
GND
5V
ALERT1
ALERT2
5V
TP1
VCC
ALERT1
ALERT2
OUT
TP3
INA_OUT
OUT_BOARD
TP4
GND
GND
3.00
R1
GND
RMT_VCC1
RMT_VCC2
RMT_VCC3
RMT_VCC4
RMT_GND4
RMT_GND3
RMT_GND2
RMT_GND1
J1
J3
J2
J4
J6
RMT_GND1
RMT_VCC1
RMT_GND2
RMT_VCC2
RMT_GND3
RMT_VCC3
RMT_GND4
RMT_VCC4
GND
OUT_BOARD
J5
5V
VCC
VDD
1
TEST
2GND 3
TMAG5124DBZ
U1
VDD
1
TEST
2GND 3
TMAG5124DBZ
U2
VDD
1
TEST
2GND 3
TMAG5124DBZ
U3
VDD
1
TEST
2GND 3
TMAG5124DBZ
U4
VDD
1
TEST
2GND 3
TMAG5124LPG
U5
DNP
VDD
1
TEST
2GND 3
TMAG5124LPG
U6
DNP
VDD
1
TEST
2GND 3
TMAG5124LPG
U7
DNP
VDD
1
TEST
2GND 3
TMAG5124LPG
U8
DNP
100nF
50V
C1
100nF
50V
C5
DNP
100nF
50V
C2
100nF
50V
C6
DNP
100nF
50V
C7
DNP
100nF
50V
C3
100nF
50V
C4
100nF
50V
C8
DNP
100nF
50V
C11
100nF
50V
C9
1.50k
R6
1.50k
R8
3.00k
R4
10.5k
R5
Figure 6-1. TMAG5124EVM Schematic
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6.2 PCB Layout
Figure 6-2 through Figure 6-5 show the PCB layout for the TMAG5124EVM.
Figure 6-2. TMAG5124EVM Top Overlay
Figure 6-3. TMAG5124EVM Top Layer
Figure 6-4. TMAG5124EVM Bottom Layer
Figure 6-5. TMAG5124EVM Bottom Overlay
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6.3 Bill of Materials
To download the bill of materials (BOM), see the design files at http://www.ti.com/tool/TIDA-00xxX.
Table 6-1. Bill of Materials
Designator Qty Value Description Package
Reference
Part Number Manufacturer Alternate Part
Number
Alternate
Manufacturer
C1, C2, C3, C4,
C9, C11
6 0.1uF CAP, CERM, 0.1
uF, 50 V, +/- 10%,
X7R, AECQ200
Grade 1, 0603
0603 CGA3E2X7R1H104
K080A A
TDK - -
C10 1 1uF CAP, CERM, 1 uF,
50 V, +/- 10%, X7R,
0603
0603 UMK107AB7105KA
-T
Taiyo Yuden - -
D1,D2 2 Blue LED, Blue, SMD LED_0805 150080BS75000 Wurth Elektronik - -
D3 1 Red LED, Red, SMD 3.2x1.6mm 150120RS75000 Wurth Elektronik - -
H1-H4 4 Bumpon,
Hemisphere, 0.44 X
0.20, Clear
Transparent
Bumpon
SJ-5303 (CLEAR) 3M - -
J1 - J4,J6 5 Terminal Block,
3.5mm, 2x1, Tin,
TH
Receptacle,
3.5mm, 2x1, TH
691214110002 Wurth Elektronik - -
J5 1 Header, 2.54 mm,
2x1, Gold, TH
Header, 2.54mm,
2x1, TH
61300211121 Wurth Elektronik - -
MAG1 1 MAGNET,
CYLINDER, 1/8" X
1 1/2", N42, NI
D2X8 KJMagnetics - -
R1 1 3.00 RES, 3.00, 1%,
0.25 W, 1206
1206 RC1206FR-073RL Yageo America - -
R2, R3 2 10.0 RES, 10.0, 1%,
0.25 W, AEC-Q200
Grade 0, 0603
0603 CRCW060310R0F
KEAHP
Vishay-Dale - -
R4 1 3.0k RES, 3.0 k, 0.1%,
0.1 W, 0603
0603 RG1608P-302-B-
T5
Susumu Co Ltd - -
R5 1 10.5k RES, 10.5 k, 0.1%,
0.1 W, 0603
0603 RT0603BRD0710K
5L
Yageo America - -
R6, R8 2 1.50k RES, 1.50 k, 1%,
0.1 W, 0603
0603 ERJ-3EKF1501V Panasonic - -
R7, R9 2 10.0k RES, 10.0 k, 1%,
0.1 W, AEC-Q200
Grade 0, 0603
0603 CRCW060310K0F
KEA
Vishay-Dale - -
R10 1 243 RES, 243, 1%, 0.1
W, AEC-Q200
Grade 0, 0603
0603 CRCW0603243RF
KEA
Vishay-Dale - -
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