Texas Instruments TCA9802 I2C Скачать руководство пользователя страница 11 | Manualshive

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Texas Instruments TCA9802 I2C Скачать руководство пользователя страница 11

SDAB1

SCLB1

SDAB2

SCLB2

GND

V

CCA

V

CCA

V

CCB

V

OUT

Operation

11

SLVUB32 – March 2017

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Copyright © 2017, Texas Instruments Incorporated

TCA9802 I

2

C Buffer Evaluation Module

4.1.2

J2, A Side SDA and SCL Selection

This connector allows for the decoupling of which device (U1 or U2) gets the SDA and SCL signals. The
default is that U1 and U2 have A side signals connected together, which is performed by the four jumpers
that are placed across J2-1 and J2-2, J2-3 and J2-4, J2-7 and J2-8, and J2-9 and J2-10.

4.1.3

JP3, V

CCB

Selection

This is the V

CCB

voltage selection header, which by default is set to 2.5 V with a jumper placed between

the J3-5 and J3-6 location. If no jumper is fitted, then V

CCB

is set to 3.3 V. A shorting jumper must be

installed on JP1 in either the high or low position. The TCA9802 is active high, and ON must not be left
floating. An external enable source can be applied to the EVM by removing the shunt and connecting a
signal to TP2. Refer to the TCA9802 data sheet (

) for proper ON and OFF voltage level settings.

A switching signal may also be used and connected at this point.

4.1.4

J4, V

CCB

Test Header

J4 allows for placing an external supply on J4-2 or for placing a meter in series to measure current coming
from the supply. J4 is loaded with a jumper by default.

4.1.5

J5 and J6, B Side Connections

These are probe connections to the B side SDA and SCL, which also go to the TMP102 temperature
sensor slave devices, U3 and U4. They can also be used to connect an external slave device.

4.1.6

SDA, SCL, and GND Test Points

These are additional large vias to facilitate connections to the B side SDA, SCL, and GND.

shows a variety of large vias that either allow for probing of signals or they can also be used to install test
points.

Figure 5. Vias Labeled on the TCA9802EVM

5

Operation

This EVM was specifically designed to translate and buffer the communication between an I

2

C master with

the TMP102 I

2

C temperature sensor. Temperature sensor U3 has an I

2

C address of 0x48 and temperature

sensor U4 has an I

2

C address of 0x49. Instructions on how to communicate with the TMP102 temperature

sensor are found in the TMP102 data sheet (

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Содержание TCA9802 I2C

Страница 1: ...nce of cables Parameters such as rise time power consumption and delay times can easily and accurately be evaluated For additional details on I2 C buffer performance application notes and the data sheet see www ti com I2C Contents 1 Introduction 2 1 1 Overview 2 1 2 EVM Features 2 2 EVM Hardware Block Diagram and Images 2 3 Hardware Description 4 4 Layout 9 4 1 Setup 10 5 Operation 11 6 Bill of Ma...

Страница 2: ...low voltages down to 0 8 V and higher voltages 1 65 V to 3 6 V The TCA9802 features an internal current source on the B side of the device allowing the removal of external pull up resistors on the B side The current source also provides an improved rise time and ultra low power consumption 1 2 EVM Features This EVM has the following features VCCA input voltage range 0 8 V to 3 6 V VCCB input volta...

Страница 3: ... com EVM Hardware Block Diagram and Images 3 SLVUB32 March 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated TCA9802 I2 C Buffer Evaluation Module Figure 1 TCA9802EVM Schematic ...

Страница 4: ...nect VCCA to the EVM using J1 6 5 7 3 4 6 9 1 2 8 TCA9802EVM Hardware Description www ti com 4 SLVUB32 March 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated TCA9802 I2 C Buffer Evaluation Module 3 Hardware Description The TCA9802 EVM is designed to allow the user to easily evaluate the I2 C buffer for a variety of conditions The breakdown of all the features and de...

Страница 5: ...LA SDAA JUMPER SDAA SDAA2 SDAA1 U1 TCA9802 SCLA SDAA SCLB SDAB SCLB SDAB U4 TMP102 SCL SDA U3 TMP102 SCL SDA J6 1 2 3 4 5 6 7 8 9 10 4 2 3 1 J5 4 2 3 1 2 The J2 connector allows for either connecting only one device to SDAA or SCLA or to simultaneously connect to U1 and U2 devices to SDAA and SCLA SCLA SCLA2 SCLA1 U2 SCLA SDAA JUMPER SDAA SDAA2 SDAA1 U1 TCA9802 SCLA SDAA J2 1 2 3 4 5 6 7 8 9 10 ww...

Страница 6: ...placeholders for capacitive loading of the input waveforms which by default are not loaded The EVM has also been setup to be able to directly probe onto the SCLB2 and SDAB2 There are large vias that facilitate the scope probe tips and probe ground connections This was designed to minimize the ground loop to minimize noise being picked up by the probe This allows for capturing clean waveforms NOTE ...

Страница 7: ...irectly probe onto the SCLB1 and SDAB1 There are large vias that facilitate the scope probe tips and probe ground connections This was designed to reduce the ground loop to minimize noise being picked up by the probe This allows for capturing clean waveforms U1 TCA9802 SCLA SDAA SCLB SDAB U3 TMP102 SCL SDA EN VCCA VCCB GND VCCB 0 Ÿ 0 Ÿ C14 CLOAD C13 CLOAD C15 CLOAD C16 CLOAD SCLA2 SDAA2 SCLB2 SDAB...

Страница 8: ... is connected directly to the V supply rail of the TMP102A U5 and U6 which decouples the current draw from VCCB The J4 jumper allows the designer to insert a current meter and measure the current being consumed by the either U1 U2 or both VOUT is 3 3 V if there is no jumper placed on J3 VOUT is 2 5 V if the jumper is placed across J3 5 and J3 6 1 8 V if the jumper is placed across J3 3 and J3 4 an...

Страница 9: ...7 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated TCA9802 I2 C Buffer Evaluation Module 4 Layout Figure 2 and Figure 3 show the PCB layout images Figure 2 TCA9802EVM Top Layout Figure 3 TCA9802EVM Bottom Layout ...

Страница 10: ...CL pins on J5 and J6 Additional large vias for the SCLB SDAB and ground are placed on the EVM to facilitate oscilloscope probe tips and scope ground connections The TCA9802EVM has a dedicated slave peripheral temperature sensor TMP102 for each unit U1 and U2 The temperature sensor of U1 U3 has an address of 0x48h and sending an I2 C read command for that address should give you a hex value of appr...

Страница 11: ...802 data sheet SCPS266 for proper ON and OFF voltage level settings A switching signal may also be used and connected at this point 4 1 4 J4 VCCB Test Header J4 allows for placing an external supply on J4 2 or for placing a meter in series to measure current coming from the supply J4 is loaded with a jumper by default 4 1 5 J5 and J6 B Side Connections These are probe connections to the B side SDA...

Страница 12: ...1 0 1 W 0603 0603 Yageo America RC0603FR 074K7L 2 R3 R4 10 0k RES 10 0 k 1 0 1 W 0603 0603 Vishay Dale CRCW060310K0FKEA 7 R9 R10 R11 R25 R26 R27 R28 0 RES 0 5 0 1 W 0603 0603 Vishay Dale CRCW06030000Z0EA 1 R13 499k RES 499 k 1 0 1 W 0603 0603 Vishay Dale CRCW0603499KFKEA 1 R14 1 05Meg RES 1 05 M 1 0 1 W 0603 0603 Vishay Dale CRCW06031M05FKEA 1 R15 332k RES 332 k 1 0 1 W 0603 0603 Vishay Dale CRCW0...

Страница 13: ...y 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 warr...

Страница 14: ...the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna types not included in this list having a gain greater than the maximum gain indicated for that type are strictly prohibited for use with this device Concernant les EVMs avec antennes détachables Conformément à la réglementation d Industrie Canada le présent émetteur radio peut fo...

Страница 15: ...ed loads Any loads applied outside of the specified output range may also result in unintended and or inaccurate operation and or possible permanent damage to the EVM and or interface electronics Please consult the EVM user guide prior to connecting any load to the EVM output If there is uncertainty as to the load specification please contact a TI field representative During normal operation even ...

Страница 16: ...COST OF REMOVAL OR REINSTALLATION ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES RETESTING OUTSIDE COMPUTER TIME LABOR COSTS LOSS OF GOODWILL LOSS OF PROFITS LOSS OF SAVINGS LOSS OF USE LOSS OF DATA OR BUSINESS INTERRUPTION NO CLAIM SUIT OR ACTION SHALL BE BROUGHT AGAINST TI MORE THAN TWELVE 12 MONTHS AFTER THE EVENT THAT GAVE RISE TO THE CAUSE OF ACTION HAS OCCURRED 8 2 Specif...

Страница 17: ... TI Resource NO OTHER LICENSE EXPRESS OR IMPLIED BY ESTOPPEL OR OTHERWISE TO ANY OTHER TI INTELLECTUAL PROPERTY RIGHT AND NO LICENSE TO ANY TECHNOLOGY OR INTELLECTUAL PROPERTY RIGHT OF TI OR ANY THIRD PARTY IS GRANTED HEREIN including but not limited to any patent right copyright mask work right or other intellectual property right relating to any combination machine or process in which TI product...

Страница 18: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments TCA9802EVM ...

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