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VD6640 bảng dữ liệu(PDF) 111 Page - STMicroelectronics

tên linh kiện VD6640
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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VD6640 bảng dữ liệu(HTML) 111 Page - STMicroelectronics

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DocID023597 Rev 11
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VG6640, VD6640
Application
125
11.5
I2C pull-up resistors
If the I2C interface is to only be used in Fast mode (400KHz) then a pull-up resistor value of
around 1K ohm is recommended for the SDA signal.
If the I2C interface is to be used in Fast+ mode (1MHz) then the value of pull-up resistor
must be chosen to ensure I2C bus constraints are met in both Fast and Fast+ mode. This is
due to the fact the 6640 will initially be in Fast mode, with a low current sink capability on
SDA, then will be switched to Fast+ mode via an I2C write. To ensure that the SDA signal
can correctly ACK a transaction in Fast mode the pull-up resistance must not be too low. A
value of around 600 ohms is appropriate to meet this constraint.
Correct characteristics of the I2C signals should always be check by measurements on
actual circuit boards as PCB parasitic capacitance can affect the signal rise and fall times.



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