NJU26100 View Datasheet(PDF) - Japan Radio Corporation

Part Name

Description

Manufacturer

NJU26100

NJU26100 Series Hardware Specification

Japan Radio Corporation  

NJU26100 Series

5.2 I2C Bus

When the NJU26100 Series is configured for I2C bus communication in GPIO0 pin (*SEL1 pin)=”Low”, the serial

host interface transfers data to the SDA pin and clocks data to the SCL pin. SDA is an open drain pin requiring an

external 4.7k pull-up resistor. AD1 and AD2 pins are used to configure the seven-bit SLAVE address of the serial

host interface. This offers additional flexibility to a system design by four different SLAVE addresses of the

NJU26100 Series. An address can be arbitrarily set up by the AD1, 2 pins. The I2C address of AD1, 2 is decided by

connection of AD1, 2 pins. The I2C address should be the same level of AD1, 2 pins. The real I2C address is

described in the each data sheet. Refer to the each data sheet.

* It excepts NJU26150. Refer to each data sheet.

Table 5-3 I2C Bus SLAVE Address

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

0

0

1

1

1

AD2*1 AD1*1 R/W

*1 The SLAVE address bit is 0 when ADx-pin is low level. The SLAVE address bit is 1 when ADx-pin is high level.

The figure on the following page shows the basic timing relationships for transfers. A transfer is initiated with a

START condition, followed by the SLAVE address byte. The SLAVE address consists of the seven-bit SLAVE

address followed by a read/write (R/W) bit. When an address with an effective serial host interface is detected, the

acknowledgement bit which sets a SDA line to Low in the ninth bit clock cycle is returned.

The R/W bit in the SLAVE address byte sets the direction of data transmission until a STOP condition terminates

the transfer. R/W = 0 indicates the host will send to the NJU26100 Series while R/W = 1 indicates the host will

receive data from the NJU26100 Series.

SDA

1-7

89

1-7

89

SCL

S

Start

P

Address R/W ACK

Data

ACK Stop

Fig. 5-2 I2C Bus Format

In case of the NJU26100 Series, only single-byte transmission is available.

The serial host interface supports “Standard-Mode (100kbps)” I2C bus data transfer.

Ver.2005-02-24

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