Texas Instruments TCA39306 User manual

User’s Guide
TCA39306 EVM User's Guide
ABSTRACT
This document covers the usage of the TCA39306 including pull up resistors, load capacitance selection, and
DUT locations for difference package options.
Table of Contents
1 Introduction.............................................................................................................................................................................2
2 Concept....................................................................................................................................................................................2
2.1 EVM Features.................................................................................................................................................................... 2
2.2 Adjustable pull-up resistors................................................................................................................................................ 2
2.3 Load Capacitance Selector................................................................................................................................................ 3
2.4 DUT locations.....................................................................................................................................................................4
3 Schematic................................................................................................................................................................................6
4 Bill of Material......................................................................................................................................................................... 7
5 Layout...................................................................................................................................................................................... 9
6 Revision History......................................................................................................................................................................9
Trademarks
All trademarks are the property of their respective owners.
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1 Introduction
The TCA39306 EVM allows the user's to test the device under different loading conditions using selectable
pull-up resistors and loading capacitance. The EVM comes with U1 (DCU package) populated, but supports the
use of the DDF and DTM package. Performance should be similar to DCU package, but the user may want to
test different packages over temperature due to different temperature coefficents.
2 Concept
2.1 EVM Features
• Adjustable pull-up resistors
• Adjustable load capacitance
• Footprint available for DDF and DTM packages
2.2 Adjustable pull-up resistors
TCA39306EVM comes with adjustable pull-up resistors which allows for the user to select from a 4.7 k and 820
Ω resistor. The board itself has a 10 k pull-up resistor on the I2C bus when no resistors are selected from the
adjustable pull up bank. When 4.7 k is selected, the effective pull up resistance is 3.2 kΩ. When only the 820
Ω pull-up is selected, the effective pull up resistance is about 750 Ω. When both adjustable pull-up resistors are
selected the effective resistance is about 650 Ω. The pull-up resistor selectors are shown in Figure 2-1.
Table 2-1. Effective pull-up resistor values table
Pull-up resistor (Ω) Equivalent pull-up resistance (Ω)
10k || 4.7 k 3.2 k
10k || 820 ~750
10k || 4.7 k || 820 ~650
Figure 2-1. Adjustable pull-up resistors
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2.3 Load Capacitance Selector
Figure 2-2 shows the board with the load capacitance selectors labeled.
Figure 2-2. Load capacitor selector
The TCA39306 EVM provides a way for the designer to test the device under capacitive loading which is one
of the main constraints in an I2C system. Switches denoted as S1, S2, S3, and S4 provide the user with the
ability to change the I2C bus capacitance with up to about 525 pF of capacitance. The switched capacitor can
be selected in increments of approximately 8 pF, 1 6pF, 33 pF, 68 pF, 130 pF, and 270 pF. For example: if the
designer wants a total capacitance of 275 pF, the designer chooses to switch in 130 pF, 68 pF, 33 pF, 16 pF,
and 8 pF for a combined capacitance of approximately 255 pF, device capacitance and PCB capacitance can be
estimated to be about 20 pF resulting in approximately 275 pF.
Note that there is additional capacitance due to parasitics from the PCB line traces and ICs on the board. For
SDA and SCL pins of a device, assume 10 pF maximum per device on the I2C line. One important aspect to
remember is the TCA39306 device does not redrive an I2C signal. This means the capacitance on both sides
of the device are not separated but are technically connected (meaning they add up in parallel) when the signal
goes from LOW to HIGH from either SDA or SCL. This is highlighted because the I2C standard limits the bus
capacitance to 400 pF for standard and fast mode and 550 pF for fast mode plus. If the I2C system is expected
to exceed this amount, an I2C buffer and redriver will be necessary to separate the capacitance between the two
sides to be below the required capacitance limits.
Current I3C specifications state bus capacitance loading should be less than 50 pF, so all switches should be
turned to the off position when testing with I3C.
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2.4 DUT locations
The TCA39306EVM comes populated with U1 as the DUT (Device Under Test) which is the TCA39306 in the
DCU package seen in the Figure 2-3. The EVM includes the DDF package and the DTM package unpopulated.
Figure 2-3. U1 location
If the user would prefer to use the DDF package, then U1 would need to be removed and U2 can then be
populated. In additional to populating U2, the resistors: R11, R12, R17, R19, R22, R20, and R23 all must be
populated with 0 Ω resistors. These resistors can be found on the back of the EVM and shown in Figure 2-4.
Figure 2-4. U2 populated
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Figure 2-5. Resistors on back of board
If the DTM package is required to be populated, U1 must be unpopulated to reveal the location of U3. Figure 2-6
shows the location of U3.
Figure 2-6. U3 Location
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3 Schematic
Figure 3-1 illustrates the EVM schematic.
SCL1
3
SDA1
4
VREF1
2
EN 8
GND 1
SCL2 6
SDA2 5
VREF2 7
TCA39306DTMR
U3
EN 8
SCL1
3
SDA1
4
VREF1
2
GND 1
SCL2 6
SDA2 5
VREF2 7
TCA39306DDFR
U2
Vref1
Vref1
Vref2
SCL1
SCL1
SDA1
SDA1
EN
SCL2
SDA2
GND
GND
EN
Vref2
SCL1
3
SDA1
4
VREF1
2
EN 8
GND 1
SCL2 6
SDA2 5
VREF2 7
TCA39306DCUR
U1
Vref1
SCL1
SDA1
GND
SCL2
SDA2
EN
Vcc1
Adjustable pull up resistors
10k
R13
4.7k
R10
820
R9
Vcc1
Adjustable pull up resistors
TP3
TP5
GND
1
J3
1
J7
Adjustable pull up resistors
10k
R14
4.7k
R15
820
R16
Vcc2
Adjustable pull up resistors
TP4
TP6
1
J4
1
J8
50V
8.2pF
C8
50V
16pF
C7
50V
33pF
C6
50V
68pF
C5
50V
130pF
C4
50V
270pF
C3
GND
1
12
SW3A
78B06ST
2
11
SW3B
78B06ST
3
10
SW3C
78B06ST
4
9
SW3D
78B06ST
5
8
SW3E
78B06ST
6
7
SW3F
78B06ST
GND
50V
8.2pF
C14
50V
16pF
C13
50V
33pF
C12
50V
68pF
C11
50V
130pF
C10
50V
270pF
C9
GND
1
12
SW4A
78B06ST
2
11
SW4B
78B06ST
3
10
SW4C
78B06ST
4
9
SW4D
78B06ST
5
8
SW4E
78B06ST
6
7
SW4F
78B06ST
GND
TP2
1
J2
Vcc2
1
J1
TP1
Vcc1
Connectors for power supplies
Adjustable load capacitance
Adjustable load capacitance
Adjustable load capacitance
Adjustable load capacitance
Additional GND connectors
1
2
J11
GND
100nF
50V
C2
Disable Option
200k
R24
Vcc2
Vref2
100nF
50V
C1
GND
1 2
J15
1 2
J14
0
R25
SCL1
SDA1
SCL2
SDA2
SCL1_Load
SDA1_Load
SDA1_Load
SCL1_Load
SCL2_Load
SDA2_Load
SCL2_Load
SDA2_Load
0
R8
0
R18
0
R7
0
R21
Vref1
112
SW1A
78B06ST
211
SW1B
78B06ST
310
SW1C
78B06ST
49
SW1D
78B06ST
58
SW1E
78B06ST
67
SW1F
78B06ST
112
SW2A
78B06ST
211
SW2B
78B06ST
310
SW2C
78B06ST
49
SW2D
78B06ST
58
SW2E
78B06ST
67
SW2F
78B06ST
0
R20 SCL2
SDA2
0R23
0
R19
0R22
0 ohm resistors on DDF package is used to reduce st ubbing on the PCB traces when set as DNP
0
R17
0
R11
4.7k
R4
820
R3
0
R12
50V
8.2pF
C15
50V
16pF
C16
50V
33pF
C17
50V
68pF
C18
50V
130pF
C19
50V
270pF
C20
10k
R5 4.7k
R2
820
R1
50V
8.2pF
C21
50V
16pF
C22
50V
33pF
C23
50V
68pF
C24
50V
130pF
C25
50V
270pF
C26
Vcc1
10k
R6
Vcc1
1 2
3 4
J6
1 2
3 4
J9
Vcc2
Vcc2
1 2
3 4
J10
1 2
3 4
J5
Vcc2
J13J12
Figure 3-1. TCA39306EVM Schematic
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4 Bill of Material
Designator Quantity Value Description PackageReference PartNumber Manufacturer
!PCB1 1 Printed Circuit Board INT151 Any
C1, C2 2 0.1uF CAP, CERM, 0.1 uF, 50 V, +/- 10%, X7R,
AEC-Q200 Grade 1, 0805
0805 GCM21BR71H104KA37K MuRata
C3, C9, C20, C26 4 270pF CAP, CERM, 270 pF, 50 V, +/- 5%, C0G/
NP0, 0603
0603 GRM1885C1H271JA01D MuRata
C4, C10, C19, C25 4 130pF CAP, CERM, 130 pF, 50 V, +/- 5%, C0G/
NP0, 0603
0603 GRM1885C1H131JA01D MuRata
C5, C11, C18, C24 4 68pF CAP, CERM, 68 pF, 50 V, +/- 5%, C0G/
NP0, 0603
0603 06035A680JAT2A AVX
C6, C12, C17, C23 4 33pF CAP, CERM, 33 pF, 50 V, +/- 5%, C0G/
NP0, 0603
0603 06035A330JAT2A AVX
C7, C13, C16, C22 4 16pF CAP, CERM, 16 pF, 50 V, +/- 5%, C0G/
NP0, 0603
0603 GRM1885C1H160JA01D MuRata
C8, C14, C15, C21 4 8.2pF CAP, CERM, 8.2 pF, 50 V, +/- 3%, C0G/
NP0, 0603
0603 06035A8R2CAT2A AVX
H1, H2, H3, H4 4 Machine Screw, Round, #4-40 x 1/4, Nylon,
Philips panhead
Screw NY PMS 440 0025 PH B&F Fastener
Supply
H5, H6, H7, H8 4 Standoff, Hex, 0.5"L #4-40 Nylon Standoff 1902C Keystone
J1, J2, J3, J4, J7, J8 6 Header, 1x1, Tin, TH Header, 1x1 PEC01SAAN Sullins Connector
Solutions
J5, J6, J9, J10 4 Header, 100mil, 2x2, Gold, TH 2x2 Header TSW-102-07-G-D Samtec
J11, J14, J15 3 Header, 100mil, 2x1, Gold, TH Sullins 100mil, 1x2,
230 mil above
insulator
PBC02SAAN Sullins Connector
Solutions
J12, J13 2 1mm Uninsulated Shorting Plug, 10.16mm
spacing, TH
Shorting Plug,
10.16mm spacing,
TH
D3082-05 Harwin
LBL1 1 Thermal Transfer Printable Labels, 0.650"
W x 0.200" H - 10,000 per roll
PCB Label 0.650 x
0.200 inch
THT-14-423-10 Brady
R1, R3, R9, R16 4 820 RES, 820, 5%, 0.125 W, AEC-Q200 Grade
0, 0805
0805 ERJ-6GEYJ821V Panasonic
R2, R4, R10, R15 4 4.7k RES, 4.7 k, 5%, 0.125 W, AEC-Q200
Grade 0, 0805
0805 ERJ-6GEYJ472V Panasonic
R5, R6, R13, R14 4 10k RES, 10 k, 5%, 0.125 W, AEC-Q200 Grade
0, 0805
0805 ERJ-6GEYJ103V Panasonic
R7, R8, R18, R21,
R25
5 0 RES, 0, 5%, 0.063 W, 0402 0402 MCR01MZPJ000 Rohm
R24 1 200k RES, 200 k, 5%, 0.125 W, AEC-Q200
Grade 0, 0805
0805 CRCW0805200KJNEA Vishay-Dale
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Designator Quantity Value Description PackageReference PartNumber Manufacturer
SW1, SW2, SW3,
SW4
4 SWITCH SLIDE DIP SPST 150MA 30V SWITCH SLIDE DIP
SPST
78B06ST Grayhill Inc
TP1 1 Test Point, Multipurpose, Orange, TH Orange Multipurpose
Testpoint
5013 Keystone
TP2 1 Test Point, Multipurpose, Red, TH Red Multipurpose
Testpoint
5010 Keystone
TP3, TP4 2 Test Point, Multipurpose, Yellow, TH Yellow Multipurpose
Testpoint
5014 Keystone
TP5, TP6 2 Test Point, Multipurpose, Blue, TH Blue Multipurpose
Testpoint
5127 Keystone
U1 1 Dual Bidirectional I2C Bus and SMBus
Voltage-Level Translator
PSOP8 TCA39306DCUR Texas Instruments
FID1, FID2, FID3 0 Fiducial mark. There is nothing to buy or
mount.
N/A N/A N/A
R11, R12, R17, R19,
R20, R22, R23
0 0 RES, 0, 5%, 0.063 W, 0402 0402 MCR01MZPJ000 Rohm
U2 0 Dual Bidirectional I2C Bus and SMBus
Voltage-Level Translator
SOT23-8 TCA39306DDFR Texas Instruments
U3 0 Dual Bidirectional I2C Bus and SMBus
Voltage-Level Translator
X2SON8 TCA39306DTMR Texas Instruments
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5 Layout
Figure 5-1 and Figure 5-2 show the PCB layout images.
Figure 5-1. TCA39306EVM Top Layout
Figure 5-2. TCA39306EVM Bottom Layout
6 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
DATE REVISION NOTES
June 2021 * Initial Release
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STANDARD TERMS FOR EVALUATION MODULES
1. Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, and/or
documentation which may be provided together or separately (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance
with the terms set forth herein. User's acceptance of the EVM is expressly subject to the following terms.
1.1 EVMs are intended solely for product or software developers for use in a research and development setting to facilitate feasibility
evaluation, experimentation, or scientific analysis of TI semiconductors products. EVMs have no direct function and are not
finished products. EVMs shall not be directly or indirectly assembled as a part or subassembly in any finished product. For
clarification, any software or software tools provided with the EVM (“Software”) shall not be subject to the terms and conditions
set forth herein but rather shall be subject to the applicable terms that accompany such Software
1.2 EVMs are not intended for consumer or household use. EVMs may not be sold, sublicensed, leased, rented, loaned, assigned,
or otherwise distributed for commercial purposes by Users, in whole or in part, or used in any finished product or production
system.
2Limited Warranty and Related Remedies/Disclaimers:
2.1 These terms do not apply to Software. The warranty, if any, for Software is covered in the applicable Software License
Agreement.
2.2 TI warrants that the TI EVM will conform to TI's published specifications for ninety (90) days after the date TI delivers such EVM
to User. Notwithstanding the foregoing, TI shall not be liable for a nonconforming EVM if (a) the nonconformity was caused by
neglect, misuse or mistreatment by an entity other than TI, including improper installation or testing, or for any EVMs that have
been altered or modified in any way by an entity other than TI, (b) the nonconformity resulted from User's design, specifications
or instructions for such EVMs or improper system design, or (c) User has not paid on time. Testing and other quality control
techniques are used to the extent TI deems necessary. TI does not test all parameters of each EVM.
User's claims against TI under this Section 2 are void if User fails to notify TI of any apparent defects in the EVMs within ten (10)
business days after delivery, or of any hidden defects with ten (10) business days after the defect has been detected.
2.3 TI's sole liability shall be at its option to repair or replace EVMs that fail to conform to the warranty set forth above, or credit
User's account for such EVM. TI's liability under this warranty shall be limited to EVMs that are returned during the warranty
period to the address designated by TI and that are determined by TI not to conform to such warranty. If TI elects to repair or
replace such EVM, TI shall have a reasonable time to repair such EVM or provide replacements. Repaired EVMs shall be
warranted for the remainder of the original warranty period. Replaced EVMs shall be warranted for a new full ninety (90) day
warranty period.
WARNING
Evaluation Kits are intended solely for use by technically qualified,
professional electronics experts who are familiar with the dangers
and application risks associated with handling electrical mechanical
components, systems, and subsystems.
User shall operate the Evaluation Kit within TI’s recommended
guidelines and any applicable legal or environmental requirements
as well as reasonable and customary safeguards. Failure to set up
and/or operate the Evaluation Kit within TI’s recommended
guidelines may result in personal injury or death or property
damage. Proper set up entails following TI’s instructions for
electrical ratings of interface circuits such as input, output and
electrical loads.
NOTE:
EXPOSURE TO ELECTROSTATIC DISCHARGE (ESD) MAY CAUSE DEGREDATION OR FAILURE OF THE EVALUATION
KIT; TI RECOMMENDS STORAGE OF THE EVALUATION KIT IN A PROTECTIVE ESD BAG.