TSL25717 Просмотр технического описания (PDF) - TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS
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TSL25717 Datasheet PDF : 24 Pages
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TSL2571
LIGHT-TO-DIGITAL CONVERTER
TAOS117A − FEBRUARY 2011
I2C Protocol
Interface and control are accomplished through an I2C serial compatible interface (standard or fast mode) to
a set of registers that provide access to device control functions and output data. The devices support the 7-bit
I2C addressing protocol.
The I2C standard provides for three types of bus transaction: read, write, and a combined protocol (Figure 17).
During a write operation, the first byte written is a command byte followed by data. In a combined protocol, the
first byte written is the command byte followed by reading a series of bytes. If a read command is issued, the
register address from the previous command will be used for data access. Likewise, if the MSB of the command
is not set, the device will write a series of bytes at the address stored in the last valid command with a register
address. The command byte contains either control information or a 5-bit register address. The control
commands can also be used to clear interrupts.
The I2C bus protocol was developed by Philips (now NXP). For a complete description of the I2C protocol, please
review the NXP I2C design specification at http://www.i2c−bus.org/references/.
A Acknowledge (0)
N Not Acknowledged (1)
P Stop Condition
R Read (1)
S Start Condition
S Repeated Start Condition
W Write (0)
... Continuation of protocol
Master-to-Slave
Slave-to-Master
1
7
S Slave Address
11
WA
8
1
Command Code A
I2C Write Protocol
8
Data Byte
1
1
A ... P
1
7
S Slave Address
11
RA
8
Data
1
8
A
Data
I2C Read Protocol
1
1
A ... P
1
7
S Slave Address
11
WA
8
Command Code
11
AS
7
Slave Address
8
Data
1
8
A
Data
I2C Read Protocol — Combined Format
Figure 9. I2C Protocols
11
RA
1
1
A ... P
The LUMENOLOGY r Company
r
r
www.taosinc.com
Copyright E 2011, TAOS Inc.
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