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BD26503GUL-E2 数据表(PDF) 11 Page - Rohm

部件名 BD26503GUL-E2
功能描述  7x17(Max ) Dot Matrix LED Display Driver
Download  44 Pages
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制造商  ROHM [Rohm]
网页  http://www.rohm.com
标志 ROHM - Rohm

BD26503GUL-E2 数据表(HTML) 11 Page - Rohm

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Technical Note
11/40
BD26503GUL
www.rohm.com
2013.02 - Rev.A
© 2013 ROHM Co., Ltd. All rights reserved.
2. I
2C BUS format
When IFMODE is set to “L”, it can interface with I
2C BUS format.
(1) Slave address
CE
A7
A6
A5
A4
A3
A2
A1
R/W
L
1
1
1
0
1
0
0
0
H
1
1
1
0
1
0
1
(2) Bit Transfer
SCL transfers 1-bit data during H. During H of SCL, SDA cannot be changed at the time of bit transfer. If SDA changes
while SCL is H, START conditions or STOP conditions will occur and it will be interpreted as a control signal.
SDA
SCL
SDA a state of stability
Data are effective
SDA
It can change
Fig.6 Bit transfer (I
2C format)
(3) START and STOP condition
When SDA and SCL are H, data is not transferred on the I
2C- bus. This condition indicates, if SDA changes from H to L
while SCL has been H, it will become START (S) conditions, and an access start, if SDA changes from L to H while SCL
has been H, it will become STOP (P) conditions and an access end.
SDA
SCL
S
P
START condition
STOP condition
Fig.7 START/STOP condition (I
2C format)
(4) Acknowledge
It transfers data 8 bits each after the occurrence of START condition. A transmitter opens SDA after transfer 8bits data,
and a receiver returns the acknowledge signal by setting SDA to L.
12
8
9
DATA OUTPUT
BY TRANSMITTER
DATA OUTPUT
BY RECEIVER
acknowledge
not acknowledge
S
START condition
clock pulse for
acknowledgement
SCL
Fig.8 Acknowledge (I
2C format)


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