LC79451KB datasheet(12/38 Pages) ONSEMI

12 / 38 page

LC79451KB

No.A2223-12/38

6. Function Explanation

6-1. I

2C/SPI Interface Selection Function

The interface supports 2-wire serial interface (I2C) and 3-wire serial interface (SPI).

The interface is selected by connecting IFSEL pin to VDD or VSS.

I2C

⇒ Connect IFSEL to VSS

SPI

⇒ Connect IFSEL to VDD

(1) I2C Interface Signal

1) RESET

(In)

----

Reset signal.

2) SCL

(In)

----

Serial clock.

3) SDA

(In/Out)

----

Serial data.

4) IFSEL

(In)

----

Serial interface selection.

5) ID1

(In)

----

I2C interface ID.

6) ID2

(In)

----

I2C interface ID.

7) BUSY

(Out)

----

Prohibition signal of the update of specific register.

8) DAOUT

(Out)

----

Reset detection signal.

(2) SPI Interface Signal

1) RESET

(In)

----

Reset signal.

2) CS

(In)

----

Device selection.

3) SCL

(In)

----

Serial clock.

4) SDA

(In)

----

Serial data.

5) IFSEL

(In)

----

Serial interface selection.

6) BUSY

(Out)

----

Prohibition signal of the update of specific register.

7) SPIDRW

(In)

----

Read/Write mode selection signal.

8) DAOUT

(Out)

----

Reset detection signal. Internal data.

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