參數(shù)資料
型號(hào)： UPC1857ACT
廠商： NEC Corp.
英文描述： SOUND CONTROL IC WITH SURROUND AND I2C BUS
中文描述： 聲控集成電路環(huán)繞和I2C總線
文件頁(yè)數(shù)： 15/44頁(yè)
文件大?。?/td> 343K
代理商： UPC1857ACT
15
μ
PC1857A
3. I
2
C BUS INTERFACE
The
μ
PC1857A has serial bus function.
This serial bus (I
(SCL) and serial data line (SDA).
The
μ
PC1857A has built-in I
2
C bus) is a double-wired bus developed by Philips. It is composed of 2 wires: serial clock line
2
C 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
μ
PC1857A 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
μ
PC1857A 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
R
p
R
p
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
μ
PC1857A takes in the data synchronized with the serial clock after that.
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