VG6640 datasheet(111/126 Pages) STMICROELECTRONICS

Teilenummer	VG6640

Bauteilbeschribung	Automotive 1.3 megapixel high-dynamic range image sensor

PDF	126 Pages

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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111 / 126 page

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.

VG6640 Datenblatt(PDF) 111 Page - STMicroelectronics