ST STEVAL-AETKT2V1 Manual de usuario

Introduction

The STEVAL-AETKT2V1 evaluation kit implements bidirectional current sense amplifiers by placing a sense resistor either in

the high side or in the low side.

The STEVAL-AETKT2V1 kit consists of a mother board and two different daughter boards for different gain configurations.

TSC21x family implements zero drift technology and is specially designed to accurately measure current by amplifying the

voltage across a shunt resistor connected to its input. The voltage drop (Vsense) is then amplified by an amplifier.

Thanks to the use of thin film resistors, TSC21x offers an extremely precise gain and very high CMRR performance.

Moreover, thanks to the possibility of fixing the output common mode voltage through a reference pin, the TSC21x can be either

used as unidirectional or bidirectional current sensing amplifier.

Figure 1. STEVAL-AETKT2V1 evaluation kit

Getting started with the STEVAL-AETKT2V1 evaluation kit for high precision

bidirectional current sense amplifiers

UM2859

User manual

UM2859 - Rev 1 - June 2021

For further information contact your local STMicroelectronics sales office.

www.st.com

1Getting started

1.1 Overview

• Input common mode voltage: 26 V

• Offset voltage: ±35 μV (±100 μV) max.

• Offset drift: 0.1 µV/°C max.

• Gain drift: 20 ppm/°C max.

• 2.7 to 26 V supply voltage

• Quiescent current: 100 μA max.

• SC70-6 and QFN10 (1.8 x 1.4 mm) package

• Temperature range: -40 to 125°C

• Gain configuration from 50 V/V to 1000 V/V

• RoHS compliant

1.2 Shunt resistance

The STEVAL-AETKT2V1 offers the possibility of soldering a shunt resistance directly on the PCB. The board can

host standard 2512 package size shunts on 4 W footprint optimized for minimal reading error.

You can choose the appropriate shunt package and value for your own application. If the chosen shunt is not

compatible with the footprint, it has be connected outside the evaluation kit.

The selection of the shunt resistor is a tradeoff between dynamic range and power dissipation. Generally, in high

current sensing applications, the focus is to reduce as much as possible the power dissipation (I²R) by choosing a

shunt with the smallest value.

The recommended shunt value is obtained from the following equation:

Rsense =VoutMax − Vol

Gain ⋅ 1+Errorgain

−2⋅ Vio ⋅1

Irange (1)

Where VoutMax is the maximum output voltage usually equal to the device VCC or the ADC connected to the

output, Vol is the output low swing value for the TSC21x family (in this case, it is 30 mV), Gain is the gain of the

selected device (for example, TSC213 has a gain of 50), ERRORgain equals to 1%, Vio represents the input offset

voltage (100 µV can be considered for TSC213), Irange is the actual range to be measured.

Note: It is recommended to take a bit smaller shunt value to have some margin and prevent saturation.

The actual current range is calculated by the following equations:

ImaxPositive =VoutMax − Vref

RSℎunt ⋅ Gain (2)

ImaxNegative =Vref − VoutMin

RSℎunt ⋅ Gain (3)

Table 1. Examples of current ranges with 3mOhm shunt over different gain, VCC and Vref values

Device VCC (V) Vref (V) Range Ipositive (A) Range INegative (A)

TSC213

3.3 2.5 4.66 -16

5 2.5 16 -16

TSC210

3.3 2.5 1.16 -4

5 2.5 4 -4

UM2859

Getting started

UM2859 - Rev 1 page 2/12

1.3 Connection

The STEVAL-AETKT2V1 evaluation kit can be connected to the application design via J1 header.

Table 2. J1 pin-out description

J1 pin Description

REF Output or input voltage reference (see Section 1.4 Voltage reference settings)

VCC Supply voltage

GND Ground

OUT TSC21x analog output value

1.4 Voltage reference settings

As the TSC21x family devices can measure current in both directions, some voltage reference has to be provided.

Voltage reference can be generated directly on the STEVAL-AETKT2V1 evaluation kit by a precision op-amp or

by shunt voltage reference. Another option is to use an external reference voltage source.

Refer to the following table for proper jumper settings.

Important: Only one jumper at a time can be placed on the kit.

Table 3. Voltage reference J2A and J2B jumper settings

J2A J2B Functionality

NA GND Unidirectional

NA VCC Unidirectional Inverted

REF1 NA Vref generated by op-amp TSB711 (default Vcc/2)(1)

REF2 NA Vref generated by shunt reference TS431 (default 1.24V)(1)

REF1 or REF2 GND or VCC Not allowed(2)

NA NA External voltage reference provided from J1

1. The reference voltage value can be adjusted by resistor values.

2. IC components might be damaged

UM2859

Connection

UM2859 - Rev 1 page 3/12

2Schematic diagrams

Figure 2. STEVAL-AETKT2V1 main board (STEVAL-AET011V1B) circuit schematic

The STEVAL-AET011V1B board is not available for separate sale

GND

VCC

GND

REF

Out

REF

OutVo

Vin+

Vin- GND

VCC

GND

VCC

GND

VCC

GND

REF_1

VCC

GND

REF_2

REF_1

REF

REF_2

VCC

Vin+

Vin-

GND

SMA4F18A

Mini spring socket for Daughter Board

REF

TERMINAL

100k

1µF

100nF

100pF

1nF

BAT54S

IN-

IN+

OUT 6

REF 1

VCC 3

GND

TSC21x

J2B

J2A

TS431

V+

V-

TSB711

SMA4F18A

IN-

IN+

OUT 6

VREF 1

VCC 3

GND

TSC21xDB

UM2859 - Rev 1 page 4/12

UM2859

Schematic diagrams

Figure 3. STEVAL-AETKT2V1 daughter board (STEVAL-AET012V1B) circuit schematic

The STEVAL-AET012V1B board is not available for separate sale

out

in-

in+

in-

ref

GND

VCC

IN-

IN+

OUT 6

REF 1

VCC 3

GND

TSC213

IN-

IN+

OUT 6

VREF 1

VCC 3

GND

DIP6

22n

VCC

GND

ref

Figure 4. STEVAL-AETKT2V1 daughter board (STEVAL-AET013V1B) circuit schematic

The STEVAL-AET013V1B board is not available for separate sale

out

in-

in+

in-

ref

GND

VCC

IN-

IN+

OUT 6

REF 1

VCC 3

GND

TSC210

IN-

IN+

OUT 6

VREF 1

VCC 3

GND

DIP6

22n

VCC

GND

ref

UM2859 - Rev 1 page 5/12

UM2859

Schematic diagrams

3Bill of materials

Table 4. STEVAL-AETKT2V1 bill of materials

Item Q.ty Ref. Part/Value Description Manufacturer Order code

11Table 5. STEVAL-

AET011V1B Main board ST Not available for separate sale

21Table 6. STEVAL-

AET012V1B Daughter board ST Not available for separate sale

31Table 7. STEVAL-

AET013V1B Daughter board ST Not available for separate sale

Table 5. STEVAL-AET011V1B bill of materials

The STEVAL-AET011V1B board is supplied with the kit and is not available for separate sale

Item Q.ty Ref. Part/Value Description Manufacturer Order code

1 1 P1 1x2, 5.08mm Terminal Block

for PCB CUI devices TB009-508-02BE

2 6 U2

DIP6, - 6x

6-5330808-5 TE

DIP 6

Mini spring

socket

Connectivity /

AMP

6-5330808-5

3 2 R1, R2 0 R, 0603 Resistors Vishay/Dale CRCW06030000Z0EAC

4 1 R7 0R, 0805 Resistor Vishay/Dale CRCW08050000Z0EAC

5 2 R4, R5 100 k, 0805,

100 V, ±1% Resistors Vishay/Dale CRCW0805100KFKEA

6 1 C2

100 nF, 0805,

50 V, ±10%,

X7R

Capacitor KEMET C0805C104K5RACTU

7 1 C7

100pF, 0805,

50V, ±10%,

C0G/NP0

Capacitor KEMET C0805C101K5GACTU

8 1 R3

1 k, 0805, 100

V, 100 mW,

±1%, ±100

ppm/K

Resistor Vishay/Dale CRCW08051K00FKEA

9 1 C3

1 nF, 0805, 50

V, ±10%,

C0G/NP0

Capacitor KEMET C0805C102K5GACTU

10 1 C1 1 µF, 0805, 50

V, ±10%, X7R Capacitor KEMET C0805C105K5RACTU

11 1 R6

2 k, 0805, 100

V, ±1%, 100

mW, ±100

ppm/K

Resistor Vishay/Dale CRCW08052K00FKEA

12 1 Rs 3m, 2512 Shunt

4 W improved

Power metal

strip resistors,

surface mount,

4-terminal (not

assembled)

Bourns CSS2H-2512K-3L00FE

13 1 D2 BAT54S,

SOT-23

40 V, 300 mA

general purpose

signal Schottky

diode

ST BAT54SFILM

UM2859

Bill of materials

UM2859 - Rev 1 page 6/12

Item Q.ty Ref. Part/Value Description Manufacturer Order code

14 2 J2A, J2B

Header 3,

HDR1X3 , step

2.54 mm

Connector M/ -

1 row Wurth Elektronik 61300311121

15 1 J1

Header 4,

HDR1X4, step

2.54 mm

Connector M/ -

1 row Wurth Elektronik 61300411121

16 1 R8

NC, 0805, ±1%,

75 V, 100 mW,

±100 ppm/K

Resistor (not

assembled) Any

17 3 C4, C5, C6 NC, 0603, 50 V,

±10%

Ceramic

capacitor (not

assembled)

Any

18 3 D1, D3, D4 SMA4F18A,

SMA Flat

400 W TVS in

SMA Flat ST SMA4F18A

19 1 D5 TS431,

SOT-23-5, ±5%

Adjustable

shunt voltage

reference IC

ST TS431BILT

20 1 U3 TSB711,

SOT-23-5

Precision, 6

MHz, RR IO, 36

V BiCMOS

operational

amplifier

ST TSB711ILT

21 1 U1 TSC21x,

SC70-6

High/low-side,

bidirectional,

zero-drift current

sense amplifier

(not assembled)

ST TSC21x

Table 6. STEVAL-AET012V1B bill of materials

The STEVAL-AET012V1B board is supplied with the kit and is not available for separate sale

Item Q.ty Ref. Part/Value Description Manufacturer Order code

1 1 C1 22 n, 0603, 50

V,±10%, X7R

Capacitor (not

mounted) KEMET C0603C223K5RACTU

2 2 U2

DIP6 - 2x

TS-103-T-A,

1x3, 2.54 mm

Precision

header Samtec TS-103-T-A

3 1 U1 TSC213,

SC70-6

High/low-side,

bidirectional,

zero-drift current

sense amplifier

ST TSC213ICT

Table 7. STEVAL-AET013V1B bill of materials

The STEVAL-AET013V1B board is supplied with the kit and is not available for separate sale

Item Q.ty Ref. Part/Value Description Manufacturer Order code

1 1 C1 22 n, 0603, 50

V,±10%, X7R

Capacitor (not

assembled) KEMET C0603C223K5RACTU

2 2 U2

DIP6 - 2x

TS-103-T-A,

1x3, 2.54 mm

Precision

header Samtec TS-103-T-A

3 1 U1 TSC210,

SC70-6

High/low-side,

bidirectional,

zero-drift current

sense amplifier

ST TSC210ICT

UM2859

Bill of materials

UM2859 - Rev 1 page 7/12

Revision history

Table 8. Document revision history

Date Revision Changes

08-Jun-2021 1 Initial release.

UM2859

UM2859 - Rev 1 page 8/12

Contents

1Getting started ....................................................................2

1.1 Overview .....................................................................2

1.2 Shunt resistance ...............................................................2

1.3 Connection....................................................................3

1.4 Voltage reference settings .......................................................3

2Schematic diagrams ...............................................................4

3Bill of materials....................................................................6

Revision history ........................................................................8

Contents ...............................................................................9

List of tables ..........................................................................10

List of figures..........................................................................11

UM2859

Contents

UM2859 - Rev 1 page 9/12

List of tables

Table 1. Examples of current ranges with 3mOhm shunt over different gain, VCC and Vref values ...................2

Table 2. J1 pin-out description .................................................................3

Table 3. Voltage reference J2A and J2B jumper settings ...............................................3

Table 4. STEVAL-AETKT2V1 bill of materials.......................................................6

Table 5. STEVAL-AET011V1B bill of materials ......................................................6

Table 6. STEVAL-AET012V1B bill of materials ......................................................7

Table 7. STEVAL-AET013V1B bill of materials ......................................................7

Table 8. Document revision history ..............................................................8

UM2859

List of tables

UM2859 - Rev 1 page 10/12

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