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This version (14 May 2024 08:49) was approved by Samruth Krishna Kumar.The Previously approved version (14 May 2024 08:42) is available.Diff

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-AD4170-4ARDZ evaluation board and EVAL-SDP-CB1Z board to the USB port of the PC to ensure the PC correctly recognizes the evaluation system.
  1. Connect the EVAL-AD4170-4ARDZ to the controller board
    1. Using the Arduino Connectors

Block Diagram

Hardware Link Options

Link Numbers Colour Default Position Descirption Rough Board Location
LK1 Blue Inserted Noise Test. Channels AIN5 + AIN6 Right of J1
LK2 Red Inserted Thermocouple - Cold Junction Resistor Bypass Right of J1
LK3 Red Inserted Precision Reference Resistor Bypass Right of J1
LK4 Red A Pos A: GPIO 1 (IOUT1) to J1 Pos B: REFOUT Right of J1
LK5 Blue B Wire Bridge EXC+ select: Pos A: MOSFET+ Pos B: AVDD Right of J2 (EXC+)
LK6 Blue Uninserted Short EXC+/REFIN+: Pos Inserted = 4 Wire Bridge Right of J2 (4/6 wire)
LK7 Blue B Wire Bridge EXC- select: Pos A: MOSFET- Pos B: Power Switch (GPIO1) Right of J2 (EXC-)
LK8 Blue Uninserted Short EXC-/AVSS: Pos Inserted = 4 Wire BridgeRight of J2 (EXC-)
LK9 Blue Uninserted Short EXC-/REFIN-: Pos Inserted = 4 Wire Bridge Right of J2 (4/6 wire)
LK10 BlackAAD4595 AIN3+ AIN4. AVDD select. Pos A: Internal AVDD Pos B: External AVDD Below of J5 (AMP34)
LK11 BlackAAD4595 AIN3+ AIN4. AVSS select. Pos A: Internal AVSS Pos B: External AVSS Below of J5 (AMP34)
LK12 Black AAD4595 AIN7+ AIN8. AVDD select. Pos A: Internal AVDD Pos B: External AVDD Below of J5 (AMP78)
LK13 Black AAD4595 AIN7+ AIN8. AVSS select. Pos A: Internal AVSS Pos B: External AVSS Below of J5 (AMP78)
LK14 N/A DNISCP connect AC amplifier external AVSS and Ground Left of J5
LK15 N/A DNISCP connect external AVSS and Ground Right of J5
LK16 N/A DNISCP connect external AVDD and Ground Right of J5
LK17 N/A DNISCP connect external IOVDD and Ground Right of J5
LK18 N/A DNISCP connect AC amplifier external AVDD and Ground Left of J5
LK19 Black UninsertedXTAL2 to Digital connector Above PMOD (P6)
LK20 Black A External VREF LTC6655 Right to J1
LK21 Black Inserted Inserted: External crystal Uninserted External clock Above SMB1 (Right)
LK22 Blue A GPIO 0: Pos A: To Connector J4 Pos B: Mosfet Below J4
LK23 Blue A GPIO 1: Pos A: To Connector J4/J2 (LK31) Pos B: Mosfet Below J4
LK24 Red A GPIO 2: Pos A: To Connector J1 Pos B: Mosfet Right of J2
LK25 Red AGPIO 3: Pos A: To Connector J1 Pos B: Mosfet Right of J2
LK26 BlackAADXL1002 Test Pos A: Test Pos B:Standard Below IOVDD LED (midle right)
LK31 Blue A GPIO1 Connector select. Pos A: J2 (Power Switch) Pos B: J3 Below J4
LK32 Black A IOVDD select. Pos A: 3.3V Pos B: EXT Below J5 (near IOVDD LED)
LK33 Black A LT1962-5 power down Pos A: On Below J5
LK34 Black A LTC3129 power down Pos A: On Below J5
LK35 Black A LT1962-2.5 power down Pos A: On Below J5
LK36 Black A LTC1983 power down Pos A: On Below J5
LK37 Black A ADP7182 power down Pos A: On Below J5
LK38 Black A ADP150 power down Pos A: On Below J5
LK39 Grey Inserted AVSS GND short Top Left
LK40 Grey Inserted AVSS GND short Above Thermocouple Connection
LK41 Grey Inserted AVSS GND short Below J4
LK42 Grey Inserted AVSS GND short Below J5
LK43 Grey Inserted AVSS GND short Right of J1
LK44 Grey Inserted AVSS GND short Below J5 (near AVDD LED)
LK45 Grey Inserted AVSS GND short Left of PMOD (P6)
LK46 Grey Inserted AVSS GND short Right of Thermocouple Connection
LKVOCM34 Black4525VOCM ADA4945 Pos A: DACOUT Pos B: VBIAS Pos C: AD4525 Pos D: REFOUT Right of Thermocouple Connection
LKVOCM78 Black4525VOCM ADA4945 Pos A: DACOUT Pos B: VBIAS Pos C: AD4525 Pos D: REFOUT Middle of board

  Resistor Jumpers need to be modified for the selection of AC or DC inputs on AIN3-AIN4 and AIN7-AIN8, below is the guide on the resistor population for the selection of input type,

AC/DC inputCH3-CH4CH7-CH8
AC inputR41, R110R27, R40
DC inputR42, R111R26,R39

*For configuring AIN3-AIN4 as AC inputs resistors R41, R110 must be populated and R42, R111 must not be populated. Similarly for configuring AIN3-AIN4 as AC inputs resistors R42, R111 must be populated and R41, R110 must not be populated. *For configuring AIN7-AIN8 as AC inputs resistors R27, R40 must be populated and R26, R39 must not be populated. Similarly for configuring AIN7-AIN8 as AC inputs resistors R26, R39 must be populated and R27, R40 must not be populated.

On Board Connections

Thermocouple Connector A1

Connector J1: DC (Analog Input)

Functionality:

  • RTD
  • Thermocouple
Connection Function
1 1) IOUT1/GPIO2 Excitation current for 3 wire RTD. LK4 (posA) 2) REFOUT lk4 (posB)
2 IOUT0 GPIO3 Excitation current for RTDs
3 AIN 8 with DC filtering
4 AIN 7 with DC filtering
5 AIN 4 with DC filtering (TC- connection)
6 AIN 3 with DC filtering (TC+ connection)
7 AIN 1 with DC filtering (RTD- connection) (Cold Junction- connection)
8 AIN 0 with DC filtering (RTD+ connection) (Cold Junction+ connection)
9 External Reference +
10 External Reference -

Connector J2: Wire Bridge (Analog Input)

Functionality:

  • 4/6 Wire bridge
  • Noise Test
Connection Function
1 Ground/shield connection
2 Excitation - (MOSFET) /Power Switch Function (GPIO1) for Wire Bridge
3 External Reference- / Sense-
4AIN 6 (AINN) with DC filtering(DNI) and noise test channel
5AIN 5 (AINP) with DC filtering(DNI) and noise test channel
6External Reference+ / Sense+
7Excitation+ (MOSFET) /AVDD supply for Wire Bridge
8 Ground/shield connection

Connector J3: AC (Analog Input)

Functionality:

  • AC connections with active filtering
Connection Function
1 AIN 8 with AC filtering
2 AIN 7 with AC filtering
3 AIN 4 with AC filtering
4 AIN 3 with AC filtering
5 AIN 2 with DC filtering
6 DACOUT with 2kΩ Load

Connector J4: Digital Outputs

Connection Function
1 GPIO1
2 GPIO0
3 DIGAUX1
4 DIGAUX2

Connector J5: External Power

Connection Function
1 External AVDD connection
2 External AVSS connection
3 External IOVDD connection
4 External GND connection
5 External AVDD connection for Amplifier
6 External AVSS connection for Amplifier
7 External GND connection for Amplifier

Digital Connectors

SDP 120 Pin Connector J6 Arduino connector P1-P5
ConnectionFunction
3,4 GND
5 V_USB
6,11,17,23,28,36,40 GND
43 DIGAUX1
44 DIGAUX2
46,52 GND
56 EEPROM_A0
58,63,69,75 GND
78 SYNC_IN
79 SCL
80 SDA
81 GND
82 SCLK
83 SDO
84 SDI
85 CS_N
86,93,98,109,115 GND
116 VIO
117,118 GND

PMOD Connector P6

Connection Function Connection Function
1 XTAL2 7 SDO
2 CS_N 8 SCLK
3 DIGAUX1 9 GND
4 SDI 10 GND
5 DIGAUX2 11 IOVDD
6 SDO 12 IOVDD

SMB Connections

There are 9 SMB connections on the board. To allow clock signals and analog inputs into the board.

  1. SMB1 Brings external MCLK to the AD4170
  2. SMB2/3/4/5 bring AIN3/4/7/8 through the AC filters to the AD4170
  3. SMB6/7/8/9 bring AIN3/4/7/8 through the DC filters to the AD4170

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.

  • Location of AVDD, AVSS and IOVDD control links are highlighted in blue in the diagram below
  • Each regulators can be shut down using their shut down links highlighted in orange below

AVDD (LK30) and AVSS (LK33) selection

  1. 5V supply (DEFAULT)
    • 5V regulator supplies AVDD
    • AVSS tied to GND [LK43-50 (GREEN)]
  2. ±2.5V split supply
    • 2.5 regulator supplies AVDD
    • -3.3 regulator to a -2.5V regulator supplied AVSS
  3. External AVDD/AVSS
    • Connections on Connector J5
SupplyRegulator Shut down Link (ORANGE)
5V regulator LTC3129-1EUD LK34
2.5V regulator LT1962 LK35
-3.3V regulator LTC1983 LK36
-2.5V regulator ADP7182 LK37

IOVDD (LK32) selection

  1. 3.3V supply (DEFAULT)
    • 3.3V regulator supplies IOVDD
    • GND tied to AVSS [LK43-50 (GREEN)]
  2. External IOVDD
    • Connections on Connector J5
SupplyRegulator Shut down Link (ORANGE)
3.3V regulator ADP7182 LK34

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

  1. Arduino connection SDP-K1
  2. PMOD connector
  3. Standalone mode
    • Removing the jumper resistors R92,R86,R88,R90 and mounting them on R93,R87,R89,R91 gives exposure to spi signals on P3 connector, using the pins from these links can then be used to fly-wire the signals to an alternative digital capture setup

For an introduction to the Serial Peripheral Interface (SPI), click here

Reference Options

  1. AD4170 Internal Reference
  2. DEFAULT:LTC6655, LTC6655 and ADR4525 On Board external reference
  3. External Reference Connector J1
    • Option to use PT1000 precision resistor (R3) insert LK3
  4. External Reference Connector J2

Selecting the reference source:

Software

Example shows setting reference for Channel 0, for channel n, go to register AFE[n]

  1. Board should be correctly connected to ACE
  2. Open AD417x memory map
  3. Search for the AFE[0] register
  4. Set the Data(control) to the desired reference source or the Data(hex) to the relevant bits
    1. Dedicated reference pins REFIN1 +/- (Hex value 0).
    2. From GPIO0/1 REFIN2 +/- (Hex value 1).
    3. Internal Reference REFIN_REFOUT (Hex Value 2).

Hardware

If REFIN1+/- is selected the options below are available using links LKREF+ and LKREF- shown in the diagram below

  1. External Voltage reference (LTC6655 - Default)

ltc6655 , REFIN - shorted to AVSS and ADR4525, REFIN - shorted to AVSS

  1. External Reference Connector J1
  2. External Reference Connector J2

Silk Screen

Location of Reference related components Location of Reference Links

GPIOs

The General purpose input/output 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 by outputting the current sequencer channel. Other optional functions include Current Source outputs , 2nd Reference input, Power-down switch.

GPIO Functionality
GPIO0 PSW
IOUT
REFIN2+
GPIO1 REFIN2-
PSW
IOUT
GPIO2IOUT
GPIO3IOUT

Evaluation board Connections and Functionality

The evaluation board highlights the functionality of the GPIOs

GPIO0

  • Available on the J4 connector. LK22 (posA)
  • Used to supply signal to the MOSFET circuit to allow for AC-excitation. LK22 (posB)

GPIO1

  • Available on the J4 connector. LK31(posA) L23(posA)
  • Used as a Power Switch for Wire Bridge applications on J2 connector. LK31(posB)L23(posA)
  • Used to supply signal to the MOSFET circuit to allow for AC-excitation. L23(posB)

GPIO2

  • Available as GPIO and used as current source (IOUT1) for RTD excitation on J1 connector. LK24 (posA) LK4(posA)
  • Used to supply signal to the MOSFET circuit to allow for AC-excitation. L24(posB)

GPIO3

  • Available as GPIO and used as current source (IOUT0) for RTD excitation on J1 connector. LK25 (posA)
  • Used to supply signal to the MOSFET circuit to allow for AC-excitation. L25(posB)
MOSFET Circuit

Below is the circuit for the AC excitation circuit. This Circuit outputs to EXC+ and EXC- on J2. This is enabled when LK22,LK23,LK24,LK25 are in posB

Schematics

Bill of Materials

Sensor configurations

This section summarizes the sensor connection and jumper configuration used depending the selected demo mode. For every demo mode, the sensor can be connected to several input channels, therefore the EVAL must be correctly configured to ensure the proper operation.

These configurations are the ones used by default with the provided mbed firmware. If any other configuration is desired, the software must be modified by the user.

2 wire RTD

*Mount Resistors R111,R42 and depopulate R42, R110 to make AIN3-AIN4 compatible for DC measurements.

*Mount Resistors R26,R39 and depopulate R27,R40 to make AIN7-AIN8 compatible for DC measurements.

3 wire RTD

*Mount Resistors R111,R42 and depopulate R42, R110 to make AIN3-AIN4 compatible for DC measurements. *Mount Resistors R26,R39 and depopulate R27,R40 to make AIN7-AIN8 compatible for DC measurements.

4 wire RTD

*Mount Resistors R26,R39 and depopulate R27,R40 to make AIN7-AIN8 compatible for DC measurements.

Thermocouple

Thermistor

*Mount Resistors R111,R42 and depopulate R42, R110 to make AIN3-AIN4 compatible for DC measurements.

*Mount Resistors R26,R39 and depopulate R27,R40 to make AIN7-AIN8 compatible for DC measurements.

Loadcell with DC excitation

*Mount Resistors R111,R42 and depopulate R42, R110 to make AIN3-AIN4 compatible for DC measurements.

*Mount Resistors R26,R39 and depopulate R27,R40 to make AIN7-AIN8 compatible for DC measurements.

Loadcell with AC excitation

*Mount Resistors R111,R42 and depopulate R42, R110 to make AIN3-AIN4 compatible for DC measurements.

*Mount Resistors R26,R39 and depopulate R27,R40 to make AIN7-AIN8 compatible for DC measurements.

Accelerometer

*Mount Resistors R24 and depopulate R25 to make AIN2 compatible for Accelerometer measurements.

resources/eval/user-guides/ad4170/hardwareguide.txt · Last modified: 14 May 2024 08:48 by Samruth Krishna Kumar