NJU26145 View Datasheet(PDF) - Japan Radio Corporation
Part Name
Description
Manufacturer
NJU26145 Datasheet PDF : 17 Pages
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NJU26100 Series
5. Host Interface
The NJU26100 Series can be controlled via Serial Host Interface (SHI) using either of two serial bus formats:
4-Wire serial bus or I2C bus. Data transfers are in 8 bit packets (1 byte) when using either format. The SHI operates
only in a SLAVE fashion. A host controller connected to the interface always drives the clock (SCL / SCK) line and
initiates data transfers, regardless of the chosen communication protocol.
Table 5-1 Serial Host Interface Pin Description
Pin No.
Symbol
(I2C / Serial)
4-Wire Serial bus Format
I2C bus Format
5
SCL/SCK
Serial Clock
Serial Clock
6
SDA/SDOUT
7
AD1/SDIN
8
AD2/SSb
Serial Data Output
Serial Data Input
SLAVE Select
Serial Data
(Bi-directional)
I2C bus address Bit1
I2C bus address Bit2
Note : SDA /SDOUT pin is a bi-directional open drain.
SDA /SDOUT output is normal CMOS output in case of 4-Wire Serial bus mode and SSb=”Low”.
SDA /SDOUT output is Hi-Z state in case of 4-Wire Serial bus mode and SSb=”High”.
This pin requires a 4.7k pull-up resister in both 4-Wire serial and I2C bus mode.
5.1 4-Wire Serial Interface
The serial host interface can be configured for 4-Wire Serial bus communication by setting GPIO0 pin (*SEL1
pin)=”High” during the Reset initialization sequence. SHI bus communication is full-duplex; a write byte is shifted
into the SDIN pin at the same time that a read byte is shifted out of the SDOUT pin. Data transfers are MSB first
and are enabled by setting the Slave Select pin Low (SSb = 0). Data is clocked into SDIN on rising transitions of
SCK. Data is latched at SDOUT on falling transitions of SCK except for the first byte (MSB) which is latched on the
falling transitions of SSb. SDOUT is Hi-Z in case of SSb = “High”. SDOUT is CMOS output in case of SSb = “Low”.
SDOUT needs a pull-up resistor when SDOUT is Hi-Z.
* It excepts NJU26150. Refer to each data sheet.
Ver.2005-02-24
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