ST STEVAL-AKI002V1 Bedienungsanleitung

Introduction

The STEVAL-AKI002V1 evaluation board allows evaluating the conversion performance of the ADC1283 eight-channel analog-

to-digital converter, which is designed for 50 ksps to 200 ksps conversion.

The board can accept external signals to measure and evaluate the ADC1283 conversion performance, based on its successive

approximation register (SAR) with an internal track-and-hold cell.

A reference voltage is also present on the board that can be connected to one of the channels through a jumper.

The board can be supplied in standalone mode. It can also be connected to a NUCLEO-L476RG development board hosting an

STM32 microcontroller, which enables further signal processing and PC communication.

To monitor the STEVAL-AKI002V1 performance, when connected to the NUCLEO-L476RG, you can use the STSW-AKI GUI.

Figure 1. STEVAL-AKI002V1 evaluation board

Getting started with the STEVAL-AKI002V1 evaluation board for the ADC1283

analog-to-digital converter

UM3086

User manual

UM3086 - Rev 1 - March 2023

For further information contact your local STMicroelectronics sales office. www.st.com

1Getting started

1.1 Features

• Six direct inputs with RC filters (301 ohms/10 nF)

• One input switchable between a direct input and a reference voltage, given by a TS3431 buffered by a

TSX711

• One input with a rail-to-rail amplifier (TSV772 with a gain equals to -1)

• SPI communication with Aardvark compatible pinout

1.2 Main components

1.2.1 ADC1283

The ADC1283 is a low-power, eight-channel CMOS 12-bit analog-to-digital converter for conversion from 50 ksps

to 200 ksps, tested at 200 ksps (3.2 MHz clock frequency).

The architecture is based on a successive-approximation register with an internal track-and-hold cell.

The ADC1283 features eight single-ended multiplexed inputs. The output serial data is straight binary and is SPI

compatible.

1.2.2 TS3431

The TS3431 is an adjustable shunt voltage reference with guaranteed temperature stability over the entire

operating temperature range (- 40°C to + 125°C).

The output voltage can be set to any value between 1.24 and 24 V through an external resistor bridge.

Available in a SOT23-3 surface mount package, it can be used in application designs where space saving is

critical.

1.2.3 TSX711

The TSX711 operational amplifier offers high precision functioning with low input offset voltage down to a

maximum of 200 µV at 25°C. In addition, thanks to its rail-to-rail input and output functionality, it can be used

on a full range input and output without limitations.

Thus, the TSX711 has the big advantage of offering a large span of supply voltages, ranging from 2.7 to 16 V.

The low input bias current performance makes the device extremely suited when used for signal conditioning in

sensor interface applications.

The high ESD tolerance (4 kV HBM) and wide temperature range make the device suitable also for the

automotive market segment.

1.2.4 TSV7722

The TSV7722 is a 22 MHz-bandwidth unity-gain-stable amplifier. The input offset voltage of 200 µV max. (50 µV

typical) at room temperature, optimized for common-mode close to ground, makes the device ideal for low-side

current measurements.

The TSV7722 can operate from 1.8 to 5.5 V single supply, on a load of 47 pF, allowing an easy usage as A/D

converter input buffer.

The device offers rail-to-rail output, excellent speed/power consumption ratio, and 22 MHz gain bandwidth

product, while consuming just 1.7 mA at 5 V.

It also features an ultra-low input bias current that enables the connection to photodiodes and other sensors

where the current is the key value to be measured.

These features make the TSV7722 ideal for high-accuracy, high-bandwidth sensor interfaces.

UM3086

Getting started

UM3086 - Rev 1 page 2/17

2How to use the board

To use the board, follow the procedure below.

Step 1. Connect the power generators to AVCC and DVCC connectors.

The allowed voltages for AVCC and DVCC are 2.7 to 5.5 V.

Figure 2. AVCC and DVCC connectors

Step 2. Connect the SPI section.

The pinout is compatible with Aardvark by TotalPhase.

Figure 3. SPI connection pins

UM3086

How to use the board

UM3086 - Rev 1 page 3/17

Step 3. When using the STSW-AKI GUI, refer to the table below for the connection between the STEVAL-

AKI002V1 SPI pins and the NUCLEO-L476RG pins.

Table 1. Pinout connection between the STEVAL-AKI002V1 and the NUCLEO-L476RG

NUCLEO-L476RG pin STEVAL-AKI002V1 SPI pin

PB12 Chip select

PB13 SCLK

PB14 MISO

PB15 MOSI

Step 4. Connect your inputs.

Step 4a. IN0-IN5: direct inputs with RC filters (301 ohms/10 nF).

Step 4b. IN6: input switchable through the J07 jumper between a direct input and a reference voltage

given by a TS3431 and buffered by a TSX711.

Step 4c. IN7: input with a rail-to-rail amplifier, TSV772, with a gain equals to -1.

Figure 4. Board section for input connection

UM3086

How to use the board

UM3086 - Rev 1 page 4/17

3Communication with the ADC1283

Option A: use the STSW-AKI GUI

The STEVAL-AKI002V1 can be used with the STSW-AKI GUI. To use it. It is necessary to use a nucleo-64

L476RG.

The STSW-AKI runs on an STM32 Nucleo-64 development board. It communicates with the ADC1283 of the

STEVAL-AKI002V1 through the SPI protocol at 125 ksps.

The STSW-AKI allows the user to monitor each channel and plot data on a graph. It is also a tool to save values

measured by the ADC1283 in a .csv file.

For more information on the STSW-AKI GUI, go to the relevant ST web page.

Figure 5. STSW-AKI: GUI for ADC120 and ADC1283

Option B: use the STEVAL-AKI002V1 directly with your test solution

The STEVAL-AKI002V1 can be plugged directly to your solution.

The SPI communication to access to the ADC1283 registers giving access to the measured values of each

channel is shown in the next tables.

Table 2. Control register bits

Bit # 7 (MSB) 6 5 4 3 2 1 0

Symbol DONTC DONTC ADD2 ADD1 ADD0 DONTC DONTC DONTC

UM3086

Communication with the ADC1283

UM3086 - Rev 1 page 5/17

Table 3. Control register bit description

Bit # Symbol Description

7, 6, 2, 1, 0 DONTC Don't care

5 ADD2

These bits determine which input channel is converted, as per Table 44 ADD1

3 ADD0

Table 4. Input channel description

ADD2 ADD1 ADD0 Address value (h) Input channel

0 0 0 00 IN0

0 0 1 08 IN1

0 1 0 10 IN2

0 1 1 18 IN3

1 0 0 20 IN4

1 0 1 28 IN5

1 1 0 30 IN6

1 1 1 38 IN7

UM3086

Communication with the ADC1283

UM3086 - Rev 1 page 6/17

4VREF measurement and inverter amplifier

A) 1.8 V reference voltage on channel 6

The STEVAL-AKI002V1 includes a reference voltage based on a TS3431 and buffered by a TSX711.

This reference voltage can be measured on the channel IN6 by selecting “REF” on the J07 jumper.

The reference voltage varies slightly according to the voltage supply. It is still stable around 1.8 V. Hence, it is

possible to use it to control the voltage supply applied on the ADC1283 and calibrate it.

Figure 6. 1.8 V reference voltage can be used on IN6

B) Inverter amplifier with a gain of -1 on IN7

On the IN7 input, a TSV772 is used in the inverter function with a gain of -1.

This gives the opportunity to test the functionality of the TSV772 and measure negative values through the

ADC1283.

This inverter is directly connected to IN7. The negative value between -AVCC and GND must be applied on IN7.

Figure 7. -1 inverter on IN7

UM3086

VREF measurement and inverter amplifier

UM3086 - Rev 1 page 7/17

5STEVAL-AKI002V1 versions

Table 5. STEVAL-AKI002V1 versions

PCB version Schematic diagrams Bill of materials

STEVAL$AKI002V1A (1) STEVAL$AKI002V1A schematic diagrams STEVAL$AKI002V1A bill of materials

1. This code identifies the STEVAL-AKI002V1 expansion board first version. It is printed on the board PCB.

UM3086

STEVAL-AKI002V1 versions

UM3086 - Rev 1 page 8/17

6Schematic diagram

Figure 8. STEVAL-AKI002V1 circuit schematic

COMMENT

- All passives components without package indication are SMT-0603 package

- All test jack components without package indication are HORIZONTAL TEST JACK 2MM package

- All connector without package indication are MALE HEADER SIP with 2.54 mm STEP package

V+

V-

U22

TSX711

GNDGND

0.1%

R22

1.8K

U21

TS3431

REF

AVCC REFERENCE VOLTAGE

VA 2

VB 13

AGND

DGND

DIN

14 DOUT 15

SCLK

/CS

IN0

IN1

IN2

IN3

IN4

IN5

IN6

IN7

U01

ADC1283

J08

SIP 2X10 MALE

SPI1_MISO

SPI1_SCK

SPI1_CS

SPI1_MOSI

SPI1_SCK

SPI1_CS

SPI1_MOSI

GND

GND GND

GND

C02

100nF

C04

100nF

AVCC

J01

COLOR GREEN

DVCC

J04

COLOR RED

GND

J02

COLOR BLACK

GND

J05

COLOR BLACK

INPUT

J12

680R

R01

GND

680R

R02

D02

D01

C10

10nF

301R

R10

GND

IN6 SET UP

J07

AVCC DVCC

IN0

IN1

IN2

IN3

IN4

IN5

IN6

C21

100nF C24

10nF

C23

22nF

330R

R24

499R

R21

0.1%

R23

3.9K

AVCC

J03

GND

DVCC

J06

GND

J11

GND

AOP

GND GND

V+

V-

U31

TSV772

AVCC

C31

22nF

GND

10K

R31

GND

10K

R32 GND

IN7

301R

R11

301R

R12

301R

R13

301R

R14

301R

R15

301R

R16

C11

10nF

C12

10nF

C13

10nF

C14

10nF

C15

10nF

C16

10nF

GND

SIP

C32

10nF

330R

R33

49.9R

R03

SMT 0805

C22

10µF

C Ca se

22µF

C01

C Ca se

22µF

C03

UM3086 - Rev 1 page 9/17

UM3086

Schematic diagram

7Bill of materials

Table 6. STEVAL-AKI002V1 bill of materials

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

1 2 C01, C03 22µF C case

25V ±20%

Tantalum

capacitors KEMET T491C226M025AT

2 3 C02, C04, C21 100nF SMT

0603 50V ±10%

Ceramic

capacitors

WURTH

ELEKTRONIK 885012206095

3 9

C10, C11, C12,

C13, C14, C15,

C16, C24, C32

10nF SMT 0603

50V ±10%

Ceramic

capacitors

WURTH

ELEKTRONIK 885012206089

4 1 C22 10µF SMT 0603

25V ±10%

Ceramic

capacitors MURATA GRM21BR61E106KA73L

5 2 C23, C31 22nF SMT 0603

50V ±10%

Ceramic

capacitors

WURTH

ELEKTRONIK 885012206091

6 1 D01

COLOR

GREEN SMT

0603 2V 20mA

LED WURTH

ELEKTRONIK 150060VS55040

7 1 D02

COLOR RED

SMT 0603 2V

20mA

LED WURTH

ELEKTRONIC 150060RS55040

8 1 J01

COLOR GREY

HORIZONTAL

TEST JACK

2MM 2100 V 5A

Test jack

JOHNSON -

CINCH

CONNECTIVIT

105-0754-001

9 2 J02, J05

COLOR BLACK

HORIZONTAL

TEST JACK

2MM 2100 V 5A

Test jack

JOHNSON -

CINCH

CONNECTIVIT

105-0753-001

10 2 J03, J06

SIP 1X2 MALE

SIP 2 STEP

2.54MM

250VAC 3A

Pin header WURTH

ELEKTRONIK 61300211121

11 1 J04

COLOR RED

HORIZONTAL

TEST JACK

2MM 2100 V 5A

Test jack

JOHNSON -

CINCH

CONNECTIVIT

105-0752-001

12 1 J07

SIP 1X3 MALE

SIP 1X3 STEP

2.54MM

250VAC 3A

Connector

header

WURTH

ELEKTRONIC 61300311121

13 1 J08

SIP 2X10 MALE

SIP 2X5 STEP

2.54MM

250VAC 3A

Pin header WURTH

ELEKTRONIK 61301021121

14 2 J11, J12

SIP 1X8 MALE

SIP 1X8 STEP

2.54MM

250VAC 3A

Pin header WURTH

ELEKTRONIK 61300811121

15 1 JU07

COLOR BLACK

STEP 2.54 MM

250VAC 3A

Jumper WURTH

ELEKTRONIK 609002115121

16 4 M-01, M-02,

M-03, M-04

10MM HOLE

Threaded

spacer

WURTH

ELEKTRONIK 970100244

17 4 M-05, M-06,

M-07, M-08 6MM HOLE M3 Screw MULTICOMP

PRO MP006574

UM3086

Bill of materials

UM3086 - Rev 1 page 10/17

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