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BU9408KS2 Datasheet(PDF) 7 Page - Rohm |
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BU9408KS2 Datasheet(HTML) 7 Page - Rohm |
7 / 57 page Technical Note 7/53 BU9408KS2 www.rohm.com 2012.03 - Rev.A © 2012 ROHM Co., Ltd. All rights reserved. 1. Command Interface BU9408KS2 uses I 2C-bus system for the command interface with a host CPU. The register of BU9408KS2 has Write-mode and Read-mode. BU9408KS2 specifies a slave address and 1 byte of selection address, and it performs writing and read-out. The slave mode format of I 2C bus is shown below. MSB LSB MSB LSB MSB LSB S Slave Address A Select Address A Data A P S : Start condition Slave Address : After the slave address (7 bits) set up by I2CADR, bit of a read-mode (H") and a write-mode (L") is attached, and a total of 8-bit data is sent. (MSB first) A: Acknowledge An acknowledge bit is added on to each bit of data transmitted. When data transmission is being done correctly, “L” is transmitted. “H” transmission means there was no acknowledge. Select Address: BU9408KS2 uses a 1-byte select address. (MSB first) Data: Data byte, transmitted data (MSB first) P: Stop condition 1 1--1 1.. D Da atta a W Wrriitte e--IIn n S Slave Address A Select Address A Data A P : Master to Slave : Slave to Master ADDR=0 MSB LSB A6 A5 A4 A3 A2 A1 A0 R/W 1 0 0 0 0 0 0 0 ADDR=1 MSB LSB A6 A5 A4 A3 A2 A1 A0 R/W 1 0 0 0 0 0 1 0 S Slave Address A Select Address A Data A Data A Data A P (例) 80h 20h 00h 00h 00h : Master to Slave : Slave to Master SDA SCL MSB 6 5 LSB Start Condition ↓ When SDA , SCL=”H” Stop Condition ↑ When SDA , SCL=”H” Setting of BU9408KS2 slave address Terminal setting Write-mode Slave-address ADDR 0 80h 1 82h |
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