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| TCA9802 Datasheet, PDF (25/36 Pages) Texas Instruments – Level-Translating I2C Bus Buffer/Repeater | |||
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www.ti.com
1.65 V
3.3 V
TCA9802
SCPS266 â MARCH 2017
5k
SDA
BUS
SCL
MASTER
400 kHz
5k
VCCA VCCB
TCA980x
SDAA SDAB
SCLA SCLB
EN
SDA
SCL
SLAVE
400 kHz
1.65 V
BUS B
VCCA VCCB
TCA980x
SDAA SDAB
SCLA SCLB
EN
SDA
SCL
SLAVE
400 kHz
BUS A
BUS C
Copyright © 2017, Texas Instruments Incorporated
Figure 31. Parallel Use Case
NOTE
Decoupling capacitors are not shown to keep the illustration simple. Decoupling capacitors
(1 µF and 0.1 µF) must be placed close to each power supply pin.
10.2.3.1 Design Requirements
The system designer must first select the correct variant of the TCA980x family for the load. In order to do this,
the information shown in Table 8 and Table 9 must be known. The setup in Figure 31 is used for these example
design requirements.
Parameter
CL
tr
VCCA
VCCB
fSCL
Table 8. Design Requirements for Bus B
Description
Load capacitance (bus capacitance) on B-
side
Rise time
VCCA supply voltage
VCCB supply voltage
I2C clock frequency
Acceptable Range
up to 400 pF
up to 300 ns
0.8 V-3.6 V
1.65 V-3.6 V
Example Value/Target
300 pF
⤠300 ns
1.65 V
3.3 V
400 kHz
Copyright © 2017, Texas Instruments Incorporated
Product Folder Links: TCA9802
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