MT7697DN datasheet(43/84 Pages) ETC2

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MT7697D

Internet-of-Things Wireless Connectivity

Page 43 of 84

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Any unauthorized use, reproduction or disclosure of this document in whole or in part is strictly prohibited.

2.5.3

I2C Serial Interface

MT7697D features two I2C serial interface master controllers. The two signals of I2C channel 0 are

I2C0_CLK and I2C0_DATA.



I2C0_CLK is a clock signal that is driven by the master.



I2C0_DATA is a bi-directional data signal that can be driven by either the master or the slave.

It supports the clock rate of 50, 100, 200, and 400 KHz.



I2C channel 1 supports the same feature as channel 0.

2.5.4

Auxiliary ADC function

MT7697D features one auxiliary ADC function. The ADC function contains a 4-channel analog switch,

a single-end input asynchronous 12-bit SAR (Successive Approximation Register) ADC, and a digital

averaging function. The digital averaging function can perform on-the-fly averaging function of

1/2/4/8/16/32/64 points. The ADC features the dithering function to enhance the DNL performance.

The ADC uses an external VREF20 as a reference voltage.

MUX

Vin

Vref

Vin

Vref

Vin

Vrdac

Vin

Vref

CMP

AUXADC0

Vcm buf

VCM

Vrdac

CDAC

AUXADC3

Vref=1.8V

SAR

Control

Logic

CLK

(2MHz)

Digital

Output

VREF20

AUXADC_MUX[3:0]

Figure 2-16. Auxiliary ADC Block Diagram (Analog Part)

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