MCP47CMB02 datasheet(46/124 Pages) MICROCHIP

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MCP47CXBXX

DS20006089B-page 46

 2018-2019 Microchip Technology Inc.

3.6

I2C – Serial Clock Pin (SCL)

The SCL pin is the serial clock pin of the I2C interface.

The MCP47CXBXX I2C interface only acts as a Slave

and the SCL pin accepts only external serial clocks.

The input data from the Master device are shifted into

the SDA pin on the rising edges of the SCL clock and

output from the device occurs at the falling edges of the

SCL clock. The SCL pin is an open-drain N-channel

driver. Therefore, it needs an external pull-up resistor

from the VDD line to the SCL pin. Refer to Section 6.0

“I2C Serial Interface Module” for more details on the

I2C serial interface communication.

3.7

I2C – Serial Data Pin (SDA)

The SDA pin is the serial data pin of the I2C interface.

The SDA pin is used to write or read the DAC registers

and Configuration bits. The SDA pin is an open-drain

N-channel driver. Therefore, it needs an external

pull-up resistor from the VDD line to the SDA pin. Except

for Start and Stop conditions, the data on the SDA pin

must be stable during the high period of the clock. The

high or low state of the SDA pin can only change when

the clock signal on the SCL pin is low. See Section 6.0

“I2C Serial Interface Module”.

3.8

I2C Slave Address Pins (A0,A1)

The state of these pins will determine the device’s I2C

Slave Address bit 0 value (overriding the ADD0 bit and

the ADD1 bit in Register 4-5).

3.9

No Connect (NC)

The NC pin is not internally connected to the device.

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