BR24G64NUX-5(2017) 데이터 시트보기 (PDF) - ROHM Semiconductor

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BR24G64NUX-5
(Rev.:2017)

Serial EEPROM Series Standard EEPROM I2C BUS EEPROM (2-Wire)

ROHM Semiconductor 

BR24G64xxx-5 Series

WP Valid Timing (Write Cancel)

WP is usually fixed to 'HIGH' or 'LOW', but when WP is controlled and used for write cancel and so on, pay attention to the

following WP valid timing. Write can be cancelled by setting WP='HIGH' while it is executed and in WP valid area. In both

byte write and page write, the area from the first start condition of command to the rise of clock which take in D0 of data(in

page write, the first byte data) is the WP invalid area. WP input in this area becomes ‘Don't care’. The area from the rise of

clock to take in D0 to the stop condition input is the WP valid area. Furthermore, after the execution of forced end by WP,

the IC enters standby status.

·Rise of D0 taken clock

·Rise of SDA

SCL

SDA

D1 D0 ACK

Enlarged view

SCL

SDA D0 ACK

Enlarged view

START

SDA

Slave

Word

Address Address

D7 D6 D5 D4 D3 D2 D1 D0

Data

STOP

tWR

ACK ACK

=LOW =LOW

ACK

=LOW

ACK

=LOW

WP Invalid Area

WP

WP Valid Area

WP Invalid Area

If WP='HIGH' in this area,

data is not written

Figure 49. WP Valid Timing

Command Cancel by Start Condition and Stop Condition

During command input, by continuously inputting start condition and stop condition, command can be cancelled. However,

within ACK output area and during data read, SDA bus may output 'LOW'. In this case, start condition and stop condition

cannot be inputted, so reset is not available. Therefore, execution of reset is needed referring ‘Method of Reset’. When

command is cancelled by start-stop condition during random read, sequential read, or current read, internal setting address

is not determined. Therefore, it is not possible to carry out current read in succession. To carry out read in succession, carry

out random read.

SCL

SDA

1

0

1

0

Start Condition Stop Condition

Figure 50. The Case of Cancel by Start, Stop Condition during Slave Address Input

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© 2017 ROHM Co., Ltd. All rights reserved.

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