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AMC6821SQDBQRQ1 датащи(PDF) 8 Page - Texas Instruments

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номер детали AMC6821SQDBQRQ1
подробное описание детали  INTELLIGENT TEMPERATURE MONITOR AND PWM FAN CONTROLLER
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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AMC6821SQDBQRQ1 датащи(HTML) 8 Page - Texas Instruments

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SMBUS INTERFACE
Communication Protocols
AMC6821-Q1
SBAS475 – JUNE 2009 ...................................................................................................................................................................................................... www.ti.com
The AMC6821 communicates through the serial system management bus (SMBus). The AMC6821 is connected
to this bus as a slave device, under the control of a bus master. The AMC6821 has a 7-bit serial bus address
that is programmable by properly connecting the address pins A0 and A1. Table 2 shows the selection of the
AMC6821 slave address. The address selection pins should be either tied directly to VDD or GND. For the NC
condition, they should be unconnected with minimum trace capacitance. Note that the address is checked only
on a reset or power-up condition.
Table 2. AMC6821 Address Select(1)
A0
A1
ADDRESS
GND
GND
0011000
NC
GND
0011010
VDD
GND
0011001
GND
NC
0101100
NC
NC
0101110
VDD
NC
0101101
GND
VDD
1001100
NC
VDD
1001110
VDD
VDD
1001101
(1)
NC = No connection.
The AMC6821 employs four standard SMBus protocols: the send byte, receive byte, write byte, and read byte.
All other operations result in undefined results. Repeated start is not allowed during the read bit.
Table 3. Send Byte
S
SLAVE ADDRESS
WR
ACK
COMMAND
ACK
P
7-bit AMC6821 slave address
8-bit register address
S = start condition; P = stop condition; shaded = slave to master; unshaded = master to slave; WR = write (bit value of 0).
Table 4. Receive Byte
S
SLAVE ADDRESS
RD
ACK
DATA
NACK
P
8-bit data from the register selected
7-bit AMC6821 slave address
previously
S = start condition; P = stop condition; shaded = slave to master; unshaded = master to slave; RD = read (bit value of 1); NACK = not
acknowledged.
Table 5. Write Byte
S
SLAVE ADDRESS
WR
ACK
COMMAND
ACK
DATA
ACK
P
7-bit AMC6821 slave address
8-bit register address
8-bit data written to register
S = start condition; P = stop condition; shaded = slave to master; unshaded = master to slave; WR = write (bit value of 0).
8
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Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s): AMC6821-Q1


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