NXP Semiconductors UM11565 User manual

UM11565
NAFExx388 evaluation board
Rev. 1 — 29 March 2023 User manual
Document information
Information Content
Keywords SPI-bus, NAFE11388, NAFE71388, NAFE13388, NAFE73388 (Future release) analog front-end,
ADC, RTD, TC, HVDD, HVSS
Abstract The NAFExx388 evaluation board is easy to test and design for the NAFE11388, NAFE71388,
NAFE13388, and NAFE73388 1 which is a highly configurable, industrial-grade multichannel
analog input analog front-end (AFE) that meets high-precision measurement requirements. The
device is composed of a low-leakage, high-voltage multiplexer, low-offset drift buffers, a low noise
and drift PGA, a precision 24-bit sigma-delta analog-to-digital converter (ADC), low-drift voltage
reference. This evaluation board, along with the LPC54628 MCU board, provide an easy-to-use
evaluation platform.

NXP Semiconductors UM11565
NAFExx388 evaluation board
Rev Date Description
v.1 20230329 Initial release
Table 1.
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NXP Semiconductors UM11565
NAFExx388 evaluation board
IMPORTANT NOTICE
For engineering development or evaluation purposes only
NXP provides the product under the following conditions:
This evaluation kit is for use of ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES
ONLY. It is provided as a sample IC pre-soldered to a printed-circuit board to make it easier to access
inputs, outputs and supply terminals. This evaluation board may be used with any development
system or other source of I/O signals by connecting it to the host MCU computer board via off-the-
shelf cables. This evaluation board is not a Reference Design and is not intended to represent a final
design recommendation for any particular application. Final device in an application heavily depends
on proper printed-circuit board layout and heat sinking design as well as attention to supply filtering,
transient suppression, and I/O signal quality.
The product provided may not be complete in terms of required design, marketing, and or
manufacturing related protective considerations, including product safety measures typically found
in the end device incorporating the product. Due to the open construction of the product, it is the
responsibility of the user to take all appropriate precautions for electric discharge. In order to minimize
risks associated with the customers’ applications, adequate design and operating safeguards must be
provided by the customer to minimize inherent or procedural hazards. For any safety concerns, contact
NXP sales and technical support services.
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NXP Semiconductors UM11565
NAFExx388 evaluation board
1 Introduction
The NAFExx388 evaluation board features a highly configurable, industrial-grade, multichannel AI-AFE family
of parts (11388, 13388, etc. …) that meets high-precision measurement requirements. The device is composed
of a low-leakage, high-voltage multiplexer, low-offset drift buffers, a low noise and drift PGA, a precision 24-bit
sigma-delta analog-to-digital converter (ADC), and low-drift voltage reference.
The AI-AFE family integrates:
•Input protection circuit for electromagnetic compatibility (EMC) and misuse wire scenarios
•Diagnostic circuits for input, open, and short circuit and impedance detection
To simplify diagnostic and functional safety, an advanced diagnostic circuit is implemented for channel loopback
reading, and output voltage or current bias circuits. The two precise reference voltage sources enable end-to-
end system self-calibration and advanced anomaly detection for predictive maintenance.
A graphical interface allows the user to easily explore the different functions of the driver. The IC communicates
to the host via the industry standard SPI-bus port. The evaluation software runs under the Microsoft Windows 7,
8, and 10 PC platform.
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NXP Semiconductors UM11565
NAFExx388 evaluation board
2 Finding kit resources and information on the NXP website
NXP Semiconductors provides online resources for evaluation board and its supported device(s) on http://
www.nxp.com.
The information page for NAFExx388-EVB evaluation board is at http://www.nxp.com/NAFExx388-EVB. The
information page provides overview information, documentation, software and tools, parametrics, ordering
information and a Getting Started tab. The Getting Started tab provides quick-reference information applicable
to using the NAFExx388-EVB evaluation board, including the downloadable assets referenced in this document.
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NXP Semiconductors UM11565
NAFExx388 evaluation board
3 Getting ready
Working with the NAFExx388-EVB requires the kit contents, additional hardware, and a Windows PC
workstation with installed software.
3.1 Kit contents
•Assembled and tested evaluation board in an antistatic bag
•USB 2.0 cable
•Spare jumpers
•AC-DC wall in 24 V power adapter
3.2 Assumptions
Familiarity with the SPI-bus is helpful, but not required.
3.3 Static handling requirements
CAUTION
This device is sensitive to ElectroStatic Discharge (ESD). Therefore care should be taken during
transport and handling. You must use a ground strap or touch the PC case or other grounded source
before unpacking or handling the hardware.
3.4 Minimum system requirements
•PC Pentium processor (or equivalent)
•One USB port (either 3.0 or 2.0 compatible)
•Windows 7, 8, 10
•OM13098 (LPC54628) MCU evaluation board (from www.nxp.com)
3.5 Power requirements
For NAFExx388 setup, connect the PC to the USB port J2 (out of the three USB ports J1, J2, and J3) to power
up the OM13098 MCU evaluation board.
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NXP Semiconductors UM11565
NAFExx388 evaluation board
4 Getting to know the hardware
4.1 Board features
Device Description Location
NAFExx388 Eight-input SW configurable AI-AFE U1
MAX13256ATB Transformer driver U4
TGMR-511V6LF Transformer U5
Si8641BC-B-IS1 Quad-channel digital isolators U7
Si8642BC-B-IS1 Quad-channel digital isolators U8
MAX14761ETB Analog switches U14
CMXDM7002A N-channel MOSFET U16
LP2950ACDT-3P3RG +3.3 V LDO U17
Table 2. NAFExx388 evaluation board main components
4.2 Kit featured components
•A complete evaluation platform for the NAFExx388
•Eight input SW configurable AI-AFE
•Easy-to-use GUI-based software demonstrates the capabilities of the NAFE11388 and NAFE13388,
depending on the part installed on the board.
•Onboard transformer to provide DC-DC power supply (+3.3 V, ±15 V) to NAFExx388
•Convenient test points for easy scope measurements and signal access
•USB interface to the host PC
•Alternatively, an external power supply can be used to power the NAFExx388 evaluation board
4.2.1 Jumpers
Setting Jumper Comment
EXT_3V3 J78A pin 1 – J78B pin 1 External +3.3 V power selection
EXT_-15V0 J78A pin 2 – J78B pin 2 External -15 V power selection
EXT_15V0 J78A pin 3 – J78B pin 3 External +15 V power selection
Table 3. Jumper settings for external power supply (+3.75 V, +15.4 V, -15.4 V)
Setting Jumper Comment
3V3_LDO J78B pin 1 – J78C pin 1 AC-DC adapter/transformer +3.3 V power selection
TX_-15V0 J78B pin 2 – J78C pin 2 AC-DC adapter/transformer -15 V power selection
TX_15V0 J78B pin 3 – J78C pin 3 AC-DC adapter/transformer +15 V power selection
Table 4. Jumper settings for AC-DC adapter/transformer power supply (+3.75 V, +15.4 V, -15.4 V)[1]
[1] Warning: Make sure J88 = OPEN before connecting AC-DC adapter.
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NXP Semiconductors UM11565
NAFExx388 evaluation board
5 Configuring the hardware
The NAFExx388 evaluation kit includes the NAFExx388 evaluation board, an OM13098 (LPC54628) evaluation
board, and a USB cable.
To set up the hardware, do the following:
1. Firmly connect the NAFExx388 (AFE) evaluation board to the LPC54628 (microcontroller) evaluation board
using the Arduino connectors.
2. To connect both boards, slide J15, J18, J19, and J22 male connectors at the bottom side of the NAFExx388
(AFE) evaluation board into the appropriate female connectors on the LPC54628 (microcontroller)
evaluation board as shown in Figure 1.
3. Apply AVDD/DVDD = 3.75 V on J9, HVDD = +15.4 V on J10, and HVSS = -15.4 V on J11 banana jack
connectors and turn on the power supply. An approximately 0.4 V additional supply on J9, J10, and J11
accounts for the voltage drop across the Schottky diode for reverse polarity protection and voltage drop
across 5 Ω resistor because of the supply current flowing into the pin of the device.
4. Use cable a USB to uUSB to connect the PC (USB) to the LPC54628EVAL (uUSB).
Figure 1. NAFExx388 evaluation board paired with OM13098 (LPC54628) evaluation board
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NXP Semiconductors UM11565
NAFExx388 evaluation board
Figure 2. Test setup showing connectivity between computer and evaluation system
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NXP Semiconductors UM11565
NAFExx388 evaluation board
6 Schematic, board layout, bill of materials
aaa-049224
AGND
HVDD
AGND
REFCAL_ H
REFCAL_ L
AI4N
AI4P
AGND
AICOM
AI3N
AI3P
AI2N
AI2P
AI1N
AI1P
HVDD
RE
F
_E
XT
RE
FN_A
D
C
RE
FP_
AD
C
CA
PN
_
AD
C
CA
PP
_
AD
C
A
G
N
D
A
VDD
RE
F
_INT
RE
F
_N
R
RE
F
_BYP
RE
F
_
B
U
F
A
G
N
D
A
VDD
A
G
N
D
DUT_3V3
REF_BYP
REF_INT
DUT_-15V0
DUT_-15V0
ADC/RESET
DUT_15V0
DUT_15V0
C24
4.7 µF
C23
0.1 µF
GND
A
G
N
D
A
G
N
D
HV
SS
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
3
2
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
17
XO
EXTCLK/XI
AGND
GPIO9
GPIO8
GPIO7
GPIO6
GPIO5
DVDD
DGND
GPIO4
GPIO3 GPIO2
GPIO1
GPIO0
AGND
AGND
AGND
AVDD
RSTB
SPI_ADDR
DGND
INTB
SYNC
CSB
SCLK
DIN
DOUT
DRDYB
DVDD
DGND
LDO_DIG
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
33
EPAD 65
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
GND
GND
REFP1
ADC/RESET
1
2
3
4
(5) ADC _nRESET
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
DUT_3V3
C22
100 pF
C21
0.1 µF
C20
4.7 µF
GND
C19
4.7 µF
C18
0.1 µF
C13
1 nF
R2
47 Ω
GND
C17
0.1 µF
C16
4.7 µF
C9
0.1 µF
C6
1 µF
C2
C3
4.7 µF
0.1 µF
C15
NOB
C11
0.1 µF
C244
4.7 µF C12
NOB
GNDGND
GND LDO O1
C5
0.1 µF
C4
4.7 µF
R153
100 Ω
J49
Header 3
Header_1X10
J89
Header 2
J81
R222
47 Ω
R25, 47 Ω
R27, 47 Ω
R30, 47 Ω
R29, 47 Ω
R28, 47 Ω R2 6, 47 Ω
R24, 430 Ω
R31, 47 Ω
D22
LED
J71
EXTCLK
C10
12 pF
C14
12 pF
GND GND GND GND
GND 1
2
2
1
3
2
4
13
GND
GND GND
GND
X1
18.432 MHz
C8
4.7 µF
C25
0.1 µF
C27
4.7 µF
R33
RTD
R32
1.25 kΩ
R34
1.25 kΩ
R205
250 Ω
D10
Diode TVS BI -DR
C43
0.1 µF
C42
0.1 µF
C238
NOB
C246
0.1 µF
R45
2.4 kΩ
C7
0.1 µF
GND
GND
GND
ADC AI1-
ADC AI1+
AI1-
AI1+
AI1-
GND2
J83
1
2
3
4
5
6
AI1+
GND
GND
GNDGND
AUX_-15V0 AUX _15V0
AUX_-15V0
EPAD
U14
MAX14761ETB
10
11
9 8 7 6
VCC
GND
B1
VN
B2
EN1 EN2 A1 VP A2
1 2 3 4 5
GND
GND GND
C28
0.1 µF
C26
4.7 µF
C23
Diode Zener
GND
C32
0.1 µF
C30
4.7 µF
GND
VREF_EXT
VREF_EX T
AUX_3V3 DUT_-15V0
C1
0.010 µF
U1
R20
10 kΩ
SW1
Push -button(red)
Header 3
J1
R3
R21
10 kΩ
D17
Diode
Zener
R4
R6
R5
R7
R9
R8
47 Ω
47 Ω
47 Ω
47 Ω
47 Ω
47 Ω
47 Ω
[5] ADC_nINT
[5] ADC_SYNC
[5] ADC_SPI0_nCS
[5] MCU_SPI0_SCK
[5] MCU_SPI0_MOSI
[5] MCU_SPI0_MISO
[5] ADC_nDR DY
DUT_3V3
AUX_3V3
DUT_3V3
DUT_3V3
REF_BUF
AUX_3V3
R1
10 kΩ
GND
R23
0 Ω
AUX_3V3
2
1
3
GND
10
9
8
7
6
5
4
3
2
1
GND
TP32
R206
250 Ω
R44
2.4 kΩ
GND GND
D9
Diode TVS BI -DR
GND
GND
C41
1 nF
GND GND
1 2 GND
ADC AI2+ AI2+
AI2+
R204
250 Ω
R43
J85
Jumper
Screw conn
GND1
2.4 kΩ
D8
Diode TVS BI-DR
D7
Diode TVS BI-DR
C4 0
1 nF
GND GND
1 2 GND
ADC AI2- AI2-
AI2-
R203
250 Ω
R42
J86
Jumper
2.4 kΩ
C227
0.1 µF
C226
4.7 µF
C230
0.1 µF
R52
NOB
D6
Diode TVS BI-DR
C39
0.1 µF
C38
0.1 µF
C237
NOB
R41
2.4 kΩ
GND
ADC AI3-
AICOM 21
ADC AI3+
AI3-
AI3+
AI3 -
GND3
J82
1
2
3
4
5
6
AI3+
GND
R51
NOB
R40
2.4 kΩ
GND
GND GND
GND GND
C33
0.010 µF
C3 4
0.010 µF
GND
D5
Diode TVS BI-DR
GND
GND
GND
C36
1 nF
GND GND
GND
ADC AI4+
AICOM
AI4+
AI4+
R38
Screw conn
GND4
2.4 kΩ
R39
2.4 kΩ
C37
1 nF
GND
R50
NOB
GND
R49
NOB
GND
D4
Diode TVS BI -DR
REFCA L_L
C35
1 nF
GND GND
ADC AI4-
ADX_REFCAL _L
ADX_REFCAL _H
AI4-
REFCAL_ L
AI4 -
R37
2.4 kΩ R48
NOB
GND
C228
0.1 µF
D3
Diode TVS BI -DR
J6
Header 2
R47
1 kΩ C45
10 nF
GND
REFCA L_H
REFCAL_ H
R46
1 kΩ C44
10 nF
GND
Figure 3. NAFExx388 portion schematic
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