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| 型號： | ADM1066ACP-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 電源管理 |
| 英文描述： | Multisupply Supervisor/Sequencer with Margining Control and Auxiliary ADC Inputs |
| 中文描述： | 10-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40 |
| 封裝： | 6 X 6 MM, MO-220VJJD-2, LFCSP-40 |
| 文件頁數(shù)： | 29/32頁 |
| 文件大?。?/td> | 861K |
| 代理商： | ADM1066ACP-REEL7 |
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ADM1066
5.
Rev. 0 | Page 29 of 32
The slave asserts ACK on SDA.
6.
The master sends a data byte that tells the slave device how
many data bytes are being sent. The SMBus specification
allows a maximum of 32 data bytes in a block write.
7.
The slave asserts ACK on SDA.
8.
The master sends N data bytes.
9.
The slave asserts ACK on SDA after each data byte.
10.
The master asserts a stop condition on SDA to end the
transaction.
0
ASLAVE
S
W A
2
(BLOCK WRITE)
4
1
3
A
5
BYTE
6
A
7
A
9
10
A
P
A
D1
8
DN
D2
Figure 44. Block Write to EEPROM or RAM
Unlike some EEPROM devices that limit block writes to within
a page boundary, there is no limitation on the start address
when performing a block write to EEPROM, except
There must be at least N locations from the start address to
the highest EEPROM address (0xFBFF), to avoid writing to
invalid addresses.
If the addresses cross a page boundary, both pages must be
erased before programming.
Note that the ADM1066 features a clock extend function for
writes to EEPROM. Programming an EEPROM byte takes
approximately 250 μs, which would limit the SMBus clock for
repeated or block write operations. The ADM1066 pulls SCL
low and extends the clock pulse when it cannot accept any
more data.
READ OPERATIONS
The ADM1066 uses the following SMBus read protocols.
Receive Byte
In a receive byte operation, the master device receives a single
byte from a slave device, as follows:
1.
The master device asserts a start condition on SDA.
2.
The master sends the 7-bit slave address followed by the
read bit (high).
3.
The addressed slave device asserts ACK on SDA.
4.
The master receives a data byte.
5.
The master asserts no acknowledge on SDA.
6.
The master asserts a stop condition on SDA, and the
transaction ends.
In the ADM1066, the receive byte protocol is used to read a
single byte of data from a RAM or EEPROM location whose
address has previously been set by a send byte or write
byte/word operation, as shown in Figure 45.
0
2
3
1
4
5
SLAVE
ADDRESS
S
R
DATA
P
A
6
A
Figure 45. Single Byte Read from EEPROM or RAM
Block Read
In a block read operation, the master device reads a block of
data from a slave device. The start address for a block read must
have been set previously. In the ADM1066, this is done by a
send byte operation to set a RAM address, or a write byte/word
operation to set an EEPROM address. The block read operation
itself consists of a send byte operation that sends a block read
command to the slave, immediately followed by a repeated start
and a read operation that reads out multiple data bytes, as
follows:
1.
The master device asserts a start condition on SDA.
2.
The master sends the 7-bit slave address followed by the
write bit (low).
3.
The addressed slave device asserts ACK on SDA.
4.
The master sends a command code that tells the slave
device to expect a block read. The ADM1066 command
code for a block read is 0xFD (1111 1101).
5.
The slave asserts ACK on SDA.
6.
The master asserts a repeat start condition on SDA.
7.
The master sends the 7-bit slave address followed by the
read bit (high).
8.
The slave asserts ACK on SDA.
9.
The ADM1066 sends a byte-count data byte that tells the
master how many data bytes to expect. The ADM1066
always returns 32 data bytes (0x20), which is the maximum
allowed by the SMBus 1.1 specification.
10.
The master asserts ACK on SDA.
11.
The master receives 32 data bytes.
12.
The master asserts ACK on SDA after each data byte.
13.
The master asserts a stop condition on SDA to end the
transaction.
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