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UPC1857ACT bảng dữ liệu(PDF) 15 Page - NEC

tên linh kiện UPC1857ACT
Giải thích chi tiết về linh kiện  SOUND CONTROL IC WITH SURROUND AND I2C BUS
PDF  44 Pages
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nhà sản xuất  NEC [NEC]
Trang chủ  http://www.nec.com/
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UPC1857ACT bảng dữ liệu(HTML) 15 Page - NEC

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15
µµµµPC1857A
3. I
2C BUS INTERFACE
The
µPC1857A has serial bus function.
This serial bus (I
2C bus) is a double-wired bus developed by Philips. It is composed of 2 wires: serial clock line
(SCL) and serial data line (SDA).
The
µPC1857A has built-in I2C bus interface circuit, and five rewritable registers (8 bits).
SCL (Serial Clock Line)
The host CPU outputs a serial clock to synchronize with the data. The
µPC1857A takes in the serial data based
on this clock.
Input level is compatible with CMOS.
Clock frequency is 0 to 100 kHz.
SDA (Serial Data Line)
The host CPU outputs the data which is synchronized with the serial clock. The
µPC1857A takes in this data
based on the clock.
Input level is compatible with CMOS.
Figure 3-1. Internal Equivalent Circuit of Interface Pin
PC1857A
µ
Rp
Rp
SCL
SDA
3.1
Data Transfer
3.1.1 Start condition
Start condition is made by SDA falling from “High” to “Low” while SCL is “High” as shown in Figure 3-2.
When this start condition is received, the
µPC1857A takes in the data synchronized with the serial clock after that.



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