UPC1857A データシートの表示（PDF） - NEC => Renesas Technology
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UPC1857A Datasheet PDF : 44 Pages
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µPC1857A
3. I2C BUS INTERFACE
The µPC1857A has serial bus function.
This serial bus (I2C 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
SCL
SDA
Rp
Rp
µ PC1857A
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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