This version (08 Apr 2024 10:39) was approved by Samruth Krishna Kumar.The Previously approved version (11 Apr 2022 11:41) is available.

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 EV-AD4170-ASD1Z-U1 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 EV-AD4170-ASD1Z-U1 to the controller board
1. Option A: Connect the EV-AD4170-ASD1Z-U1 to the EVAL-SDP-CK1Z
  1. 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.
  2. Using the Arduino Connectors
2. Option B: Connect the EV-AD4170-ASD1Z-U1 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	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 Bridge	Right of J2 (EXC-)
LK9	Blue	Uninserted	Short EXC-/REFIN-: Pos Inserted = 4 Wire Bridge	Right of J2 (4/6 wire)
LK10	Black	A	AD4595 AIN3+ AIN4. AVDD select. Pos A: Internal AVDD Pos B: External AVDD	Below of J5 (AMP34)
LK11	Black	A	AD4595 AIN3+ AIN4. AVSS select. Pos A: Internal AVSS Pos B: External AVSS	Below of J5 (AMP34)
LK12	Black	A	AD4595 AIN7+ AIN8. AVDD select. Pos A: Internal AVDD Pos B: External AVDD	Below of J5 (AMP78)
LK13	Black	A	AD4595 AIN7+ AIN8. AVSS select. Pos A: Internal AVSS Pos B: External AVSS	Below of J5 (AMP78)
LK14	N/A	DNI	SCP connect AC amplifier external AVSS and Ground	Left of J5
LK15	N/A	DNI	SCP connect external AVSS and Ground	Right of J5
LK16	N/A	DNI	SCP connect external AVDD and Ground	Right of J5
LK17	N/A	DNI	SCP connect external IOVDD and Ground	Right of J5
LK18	N/A	DNI	SCP connect AC amplifier external AVDD and Ground	Left of J5
LK19	Black	Uninserted	XTAL2 to Digital connector	Above PMOD (P6)
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	A	GPIO 3: Pos A: To Connector J1 Pos B: Mosfet	Right of J2
LK26	Black	A	ADXL1002 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	Black	4525	VOCM ADA4945 Pos A: DACOUT Pos B: VBIAS Pos C: AD4525 Pos D: REFOUT	Right of Thermocouple Connection
LKVOCM78	Black	4525	VOCM 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 input	CH3-CH4	CH7-CH8
AC input	R41, R110	R27, R40
DC input	R42, R111	R26,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-
4	AIN 6 (AINN) with DC filtering(DNI) and noise test channel
5	AIN 5 (AINP) with DC filtering(DNI) and noise test channel
6	External Reference+ / Sense+
7	Excitation+ (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
Connection	Function
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.

SMB1 Brings external MCLK to the AD4170
SMB2/3/4/5 bring AIN3/4/7/8 through the AC filters to the AD4170
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

5V supply (DEFAULT)
- 5V regulator supplies AVDD
- AVSS tied to GND [LK43-50 (GREEN)]
±2.5V split supply
- 2.5 regulator supplies AVDD
- -3.3 regulator to a -2.5V regulator supplied AVSS
External AVDD/AVSS
- Connections on Connector J5

Supply	Regulator	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

3.3V supply (DEFAULT)
- 3.3V regulator supplies IOVDD
- GND tied to AVSS [LK43-50 (GREEN)]
External IOVDD
- Connections on Connector J5

Supply	Regulator	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

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
- Removing the links LK12,27,28,29and 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

AD4170 Internal Reference
DEFAULT ADR4525 On Board external reference
External Reference Connector J1
- Option to use PT1000 precision resistor (R3) insert LK3
External Reference Connector J2

Selecting the reference source:

Software

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

Board should be correctly connected to ACE
Open AD417x memory map
Search for the AFE[0] register
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

ADR4525, REFIN - shorted to AVSS
External Reference Connector J1
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
GPIO2	IOUT
GPIO3	IOUT

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

AD4170 Schematic pdf

Bill of Materials

AD4170 Evaluation board Bill of materials

Next Page: Software Procedures

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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.