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UPC1853 Scheda tecnica(PDF) 17 Page - NEC

Il numero della parte UPC1853
Spiegazioni elettronici  MATRIX SURROUND IC WITH I2C BUS
PDF  76 Pages
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Produttore elettronici  NEC [NEC]
Homepage  http://www.nec.com/
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UPC1853 Scheda tecnica(HTML) 17 Page - NEC

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µPC1853
17
3.
I2C BUS INTERFACE
The
µPC1853 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
µPC1853 has built-in I2C bus interface circuit, 9 rewritable registers (8 bits).
SCL (Serial Clock Line)
The master CPU outputs serial clock to synchronize with the data. According to this clock, the
µPC1853 takes
in the serial data.
Input level is compatible with CMOS.
Clock frequency is 0 to 100 kHz.
SDA (Serial Data Line)
The master CPU outputs the data which is synchronized with serial clock. The
µPC1853 takes in this data according
to the clock.
Input level is compatible with CMOS.
Fig. 3-1 Internal Equivalent Circuits of Interface Pin
SCL
SDA
RP
RP
PC1853
µ
3.1
Data Transfer
3.1.1
Start condition
Start condition is made by falling of SDA from “High” to “Low” during SCL is “High” as shown in Fig. 3-2.
When this start condition is received, the
µPC1853 takes in the data synchronizing with the clock after that.



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