BR24T1M-3AM 데이터 시트보기 (PDF) - ROHM Semiconductor

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BR24T1M-3AM

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

ROHM Semiconductor 

BR24T1M-3AM

Datasheet

Software Reset

Software reset is executed to avoid malfunction after power ON, and during command input. Software reset has several

kinds, and 3 kinds of them are shown in the figure below. (Refer to Figure 41-(a)., Figure 41-(b)., Figure 41-(c).) Within the

dummy clock input area, the SDA bus is released ('H' by pull up) and ACK output and read data '0' (both 'L' level) may be

output from EEPROM. Therefore, if 'H' is input forcibly, output may conflict and over current may flow, leading to

instantaneous power failure of system power source or influence upon devices.

SCL

SDA

Dummy clock×14

Start×2

12

13 14

Normal command

Normal command

SCL

SDA

Figure 41-(a). The Case of Dummy Clock × 14 +START+START+ Command Input

Start

Dummy clock×9

Start

12

89

Normal command

Normal command

SCL

SDA

Figure 41-(b). The Case of START + Dummy Clock × 9 +START+ Command Input

Start×9

1 23

7 89

Normal command

Normal command

Figure 41-(c). START×9+ Command Input

タ ※トStart command from START input.

Acknowledge Polling

During internal write execution, all input commands are ignored, therefore ACK is not returned. During internal automatic

write execution after write cycle input, next command (slave address) is sent, and if the first ACK signal sends back 'L', then

it means end of write operation, else 'H' is returned, which means writing is still in progress. By the use of acknowledge

polling, next command can be executed without waiting for tWR = 5ms.

To write continuously, R/W = 0, then to carry out current read cycle after write, slave address with R/W = 1 is sent, and if

ACK signal sends back 'L', then execute word address input and data output and so forth.

First write command

During internal write,

ACK = HIGH is returned.

SDA

S

T

A

R

T

Write command

S

T

O

P

S

T

A

Slave

R address

A

C

K

H

S

T Slave

A

R address

A

C

K

H

…

T

T

tWR

Second write command

…

S

T Slave

A

R

address

A

C

K

H

T

tWR

S

T Slave

A

R

address

A

C

K

L

Word

address

T

A

C

K

L

Data

AS

CT

K

L

O

P

After completion of internal write,

ACK=LOW is returned, so input next

word address and data in succession.

Figure 42. Case to Continuous Write by Acknowledge Polling

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TSZ22111・15・001

18/28

TSZ02201-0GFG0G100430-1-2

08.Jul.2016 Rev.001

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