NJU26109 NJRC [New Japan Radio], NJU26109 Datasheet - Page 13

• Manufacturer Part Number: NJU26109
• Description: NJU26100 Series Hardware Specification
• Manufacturer: NJRC [New Japan Radio]

5. Host Interface
4-Wire serial bus or I
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.
5.1 4-Wire Serial Interface
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
The NJU26100 Series can be controlled via Serial Host Interface (SHI) using either of two serial bus formats:
The serial host interface can be configured for 4-Wire Serial bus communication by setting GPIO0 pin (*SEL1
Note : SDA /SDOUT pin is a bi-directional open drain.
Pin No.
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 I
5
6
7
8
Table 5-1 Serial Host Interface Pin Description
2
C bus. Data transfers are in 8 bit packets (1 byte) when using either format. The SHI operates
SDA/SDOUT
(I
AD1/SDIN
SCL/SCK
AD2/SSb
2
Symbol
C / Serial)
4-Wire Serial bus Format
Serial Data Output
Serial Data Input
SLAVE Select
Serial Clock
I
I
2
2
2
C bus mode.
C bus address Bit1
C bus address Bit2
I
(Bi-directional)
2
C bus Format
Serial Clock
Serial Data
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