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LC01707PLF
Communication specification
Communication specifications are indicated as below:
Serial Interface (I 2 C-bus);
Sending and receiving data through I 2 C-bus that consists of two bus lines of a serial data line (SDA) and a serial clock
line (SCL). This bus enables 8-bit bi-directional serial data to transmit at the maximum speed of 400kbits (fast mode).
This is not compatible with Hs mode.
Terms used in I 2 C
The following terms are used in I 2 C
Terms
Transmitter
Receiver
Master
Slave
Description
Device to send data to the bus
Device to receive from the bus
Device to start data transmission, generate signal, and terminate data transmission
Device of which address is designated master
[Start] and [Stop] conditions
[Start] condition is required at the start of data communication and [Stop] condition at the end of data communication.
The condition in which the SDA line changes from [H] to [L] with SCL at [H] is called the [Start] condition. The
condition in which the SDA line changes from [L] to [H] with SCL at [H] is called the [Start] condition.
SDA
SDA
SCL
S
START condition
P
STOP condition
SCL
Data transmission
The length of each byte which is output to SDA line is always 8 bits. An acknowledge bit is needed after each byte.
Data is transmitted sequentially from the most significant bit (MSB).
During the data transfer, the slave address is transmitted after the [Start] condition (S).
Data transfer is always ended by the [Stop] condition (P) generated by the master.
ACK:acknowledgement
ACK signal from slave
ACK signal from receiver
P
SDA
D7
D6
D1
D0
MSB
Byte complate,
interrupt within slave
Clock line held low while
interrrupts are serviced
Sr
SCL
S
or
Sr
1
2
7
8
9
1
2
3-8
9
Sr
or
P
START or repeated
START condition
Clock pulse for ACK
Clock pulse for ACK
STOP or repeated
START condition
No.A1928-9/18
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