This version (17 May 2024 10:59) was approved by Pranjali Agrawal.
Table of Contents
EVAL-AD7192ASDZ Hardware Guide
Set-up Procedures
After following the instructions in the Software Procedures section, set up the evaluation and SDP boards as detailed in this section.
- Warning: The evaluation software and drivers must be installed before connecting the EVAL-AD7192ASDZ evaluation board and EVAL-SDP-CB1Z board to the USB port of the PC to ensure the PC correctly recognizes the evaluation system.
- Connect the EVAL-AD7192ASDZ to the controller board
- Option A: Connect the EVAL-AD7192ASDZ to the EVAL-SDP-CK1Z
- Using the 120 pin connector
- Screw the two boards together using the plastic screw-washer set included in the evaluation board kit to ensure that the boards are connected firmly together.
- Using the Arduino Connectors
- Option B: Connect the EVAL-AD7192ASDZ to the EVAL-SDP-CB1Z
- Using the 120 pin connector
- Screw the two boards together using the plastic screw-washer set included in the evaluation board kit to ensure that the boards are connected firmly together.
Block Diagram
Hardware Link Options
| Link Numbers | Colour | Default Position | Descirption |
|---|---|---|---|
| LK7 | Black | A | DVDD voltage select: Pos A: DVDD is connected to 3.3V Pos B: DVDD is connected to AVDD |
| LK8 | Black | A | IOVDD voltage select: Pos A: sets IOVDD to 3.3v LDO supply Pos B: sets IOVDD to external source |
| LK9 | Black | C | AVDD voltage select: Pos A: sets AVDD to 3.3v LDO supply Pos B: sets AVDD to external source Pos C: sets AVDD to 5V LDO Supply |
| LK10 | Black | Uninserted | Used as external AVDD voltage connector for scp boards |
| LK11 | Black | Uninserted | Used as external IOVDD voltage connector for scp boards |
| LK12 | Black | A | Used for stacking of Eval boards. To select Eval board(CS_N): Pos A(1-2): selects eval board 1 (CS_ARD_1) Pos B(2-3): selects eval board 2 (CS_ARD_2) |
| LK13 | Black | Uninserted | This link shorts AIN1 to AIN2. This is useful to perform noise tests on the AD7192 |
On Board Connections
Bridge Connections
Connector P1: DC (Analog Input)
Functionality:
- Bridge Connection
| Connection | Function |
|---|---|
| 1 | Ground/Sheild |
| 2 | Excitation- |
| 3 | External Reference - |
| 4 | AIN 3 with DC filtering |
| 5 | AIN 4 with DC filtering |
| 6 | External Reference + |
| 7 | Excitation+ |
| 8 | Ground/Sheild |
Link Lk13: Low Noise Test Circuitry
Functionality:
- Low Noise Test
-ALL INSERTED
| Connection | Function |
|---|---|
| 1-2 | AVDD |
| 3-4 | AIN1 |
| 5-6 | AIN2 |
| 7-8 | AINCOM |
External Powers
| Connector | Function |
|---|---|
| P3 Pin 1-2 | External IOVDD connection |
| P3 Pin 3-4 | External AVDD connection |
| LK10 | External AVDD connection for SCP Boards |
| LK11 | External IOVDD connection for SCP Boards |
Digital Connectors
| SDP 120 Pin Connector P5 | Function | Arduino connector P6,P7,P9,P10 |
|---|---|---|
| 3,4 | GND | P7-6,P7-7 |
| 5 | V_USB | P7-5 |
| 6,11,17,23,28,36,40,46,52 | GND | P9-7 |
| 56 | EEPROM_A0 | - |
| 58,63,69,75 | GND | - |
| 78 | SYNC_IN | P10-5 |
| 79 | SCL | P10-10 |
| 80 | SDA | P10-9 |
| 81 | GND | - |
| 82 | SCLK | P10-6 |
| 83 | SDO/MSIO | P10-5 |
| 84 | SDI/MOSI | P10-4 |
| 85 | CS_N | P9-3,P9-2 |
| 86,93,98,109,115 | GND | - |
| 116 | VIO | P7-2 |
| 117,118 | GND | - |
PMOD Connector P11
| Connection | Function | Connection | Function |
|---|---|---|---|
| 1 | CS_N | 7 | - |
| 2 | DIN | 8 | - |
| 3 | DOUT | 9 | - |
| 4 | SCLK | 10 | - |
| 5 | GND | 11 | GND |
| 6 | IOVDD | 12 | IOVDD |
SMB Connections
There are 3 SMB connections on the board. To allow clock signals and reference into the board.
- J1 Provides option for External Reference+
- J2 Provides option for External Reference-
- J3 Brings external MCLK to the AD7192
Power Supplies
The evaluation board receives power through the controller board when connected to the PC via USB. Linear regulators generate the required power supply levels from the applied USB voltage.
AVDD (LK9) selection
DVDD (LK7) selection
- 3.3V supply (DEFAULT)
- 3.3V supplies DVDD
- AVDD
- AVDD connected to DVDD
IOVDD (LK8) selection
- 3.3V supply (DEFAULT)
- 3.3V regulator supplies IOVDD ADP150
- External IOVDD
- Connections on Connector J4
- V_IO from SDP
- R4 to be mounted
Serial Interface
There are four primary signals: CS, SCLK, SDI, and SDO/RDY (all are inputs, except for SDO/RDY, which is an output).
Serial communication options
- SDP-B board and the respective 120 pin SDP connector.
- When using the SDP-B connection (120 pin) The evaluation board connects via the serial peripheral interface (SPI) to the Blackfin® ADSP-BF527 on the SDP-B board.
- Arduino connection SDP-K1
- PMOD connector
- Standalone mode
For an introduction to the Serial Peripheral Interface (SPI), click here
Reference Options
- DEFAULT ADR4525 On Board external reference on REFIN1+
- LTC6655LN-2.5/LTC6655LN-4.096 On Board external reference on REFIN+
- Option to use ultra low noise reference
- External Reference on REFIN1+ Connector J1
- AVDD as Reference via R33
- External reference can be supplied on P2-2 and P2-3 for REFIN2+ and REFIN2-
Selecting the reference source:
Software
Board should be correctly connected to ACE
- Option A: Open AD7192 memory map
Search for the Configuration register
- Set the REFSEL[] to the desired reference source by using these bits
- REFSEL[0]: External reference applied between REFIN1(+) and REFIN1(−).
- REFSEL[1]:External reference applied between P1/REFIN2(+) and P0/REFIN2(-) pins.
- Option B: Open AD7192 Chip View
- Right click on ADC block
- Select Reference Source from the Reference Select option given as highlighted(1) below in the picture.
- Click on Apply Changes as highlighted(2) below.
GPIOs
The General purpose inout pins are powered by AVDD/AVSS. They can be used to provide AC-Excitation signals for AC-Excited sensors, using 2 or 4 outputs. Can be used to automatically control an external multiplexer. Other optional functions include Current Source outputs , 2nd Reference input, Power-down switch.
| GPIO | Bit Name | Functionality |
|---|---|---|
| BPDSW | BPDSW | Bridge power-down switch |
| P3 | P3DAT | Digital Output P3 |
| P2 | P2DAT | Digital Output P2 |
| P1 | P1DAT | Digital Output P1/REFIN2+ |
| P0 | P0DAT | Digital Output P0/REFIN2- |
Evaluation board Connections and Functionality
The evaluation board highlights the functionality of the GPIOs
BPDSW
- Used as a Power Switch for Wire Bridge applications
P0/REFIN2-
- Available on the P2 connector.
- Also used as secondary reference option.
P1/REFIN2+
- Available on the P2 connector.
- Also used as secondary reference option.
Schematics
Bill of Materials
resources/eval/user-guides/ad7192/hardwareguide.txt · Last modified: 16 Nov 2023 12:36 by Pranjali Agrawal