參數(shù)資料
型號(hào)： AD9523/PCBZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 22/60頁(yè)
文件大小： 0K
描述： BOARD EVAL FOR AD9523
設(shè)計(jì)資源： AD9523(-1) Eval Board Schematic
AD9523(-1) BOM
AD9523(-1) Gerber Files
標(biāo)準(zhǔn)包裝： 1
主要目的： 計(jì)時(shí)，時(shí)鐘發(fā)生器
嵌入式： 否
已用 IC / 零件： AD9523
主要屬性： 板載 PLL 環(huán)路濾波器
次要屬性： LED 狀態(tài)指示器
已供物品： 板
相關(guān)產(chǎn)品： AD9523BCPZ-REEL7-ND - IC INTEGER-N CLCK GEN 72LFCSP
AD9523BCPZ-ND - IC INTEGER-N CLCK GEN 72LFCSP
AD9523-1BCPZ-ND - IC INTEGER-N CLCK GEN 72LFCSP
AD9523-1BCPZ-REEL7-ND - IC INTEGER-N CLCK GEN 72LFCSP
Data Sheet
AD9523
Rev. C | Page 29 of 60
SDA
MSB
ACKNOWLEDGE FROM
SLAVE-RECEIVER
ACKNOWLEDGE FROM
SLAVE-RECEIVER
SCL
S
P
1
2
8
9
1
2
8
3 TO 7
9
10
08439-
162
Figure 32. Acknowledge Bit
SDA
MSB = 0
ACKNOWLEDGE FROM
SLAVE-RECEIVER
ACKNOWLEDGE FROM
SLAVE-RECEIVER
SCL
S
P
1
2
8
9
1
2
8
3 TO 7
9
10
0843
9-
163
Figure 33. Data Transfer Process (Master Write Mode, 2-Byte Transfer Used for Illustration)
SDA
ACKNOWLEDGE FROM
MASTER-RECEIVER
NO ACKNOWLEDGE
FROM
SLAVE-RECEIVER
SCL
S
P
1
2
8
9
1
2
8
3 TO 7
9
10
MSB = 1
0
8439-
16
4
Figure 34. Data Transfer Process (Master Read Mode, 2-Byte Transfer Used for Illustration)
The no acknowledge bit is the ninth bit attached to any 8-bit
data byte. A no acknowledge bit is always generated by the
receiving device (receiver) to inform the transmitter that the
byte has not been received. It is accomplished by leaving the SDA
line high during the ninth clock pulse after each 8-bit data byte.
Data Transfer Process
The master initiates data transfer by asserting a start condition.
This indicates that a data stream follows. All I2C slave devices
connected to the serial bus respond to the start condition.
The master then sends an 8-bit address byte over the SDA line,
consisting of a 7-bit slave address (MSB first), plus an R/W bit.
This bit determines the direction of the data transfer, that is,
whether data is written to or read from the slave device
(0 = write, 1 = read).
The peripheral whose address corresponds to the transmitted
address responds by sending an acknowledge bit. All other devices
on the bus remain idle while the selected device waits for data
to be read from or written to it. If the R/W bit is 0, the master
(transmitter) writes to the slave device (receiver). If the R/W bit is 1,
the master (receiver) reads from the slave device (transmitter).
The format for these commands is described in the Data
Data is then sent over the serial bus in the format of nine clock
pulses, one data byte (eight bits) from either master (write mode)
or slave (read mode), followed by an acknowledge bit from the
receiving device. The number of bytes that can be transmitted per
transfer is unrestricted. In write mode, the first two data bytes
immediately after the slave address byte are the internal memory
(control registers) address bytes with the high address byte first.
This addressing scheme gives a memory address of up to 216 1 =
65,535. The data bytes after these two memory address bytes are
register data written into the control registers. In read mode, the
data bytes after the slave address byte are register data read from
the control registers. A single I2C transfer can contain multiple data
bytes that can be read from or written to control registers whose
address is automatically incremented starting from the base
memory address.
When all data bytes are read or written, stop conditions are
established. In write mode, the master (transmitter) asserts
a stop condition to end data transfer during the 10th clock pulse
following the acknowledge bit for the last data byte from the slave
device (receiver). In read mode, the master device (receiver)
receives the last data byte from the slave device (transmitter) but
does not pull it low during the ninth clock pulse. This is known as a
no acknowledge bit. Upon receiving the no acknowledge bit, the
slave device knows that the data transfer is finished and releases
the SDA line. The master then takes the data line low during the
low period before the 10th clock pulse and high during the 10th
clock pulse to assert a stop condition.
A repeated start (Sr) condition can be used in place of a stop
condition. Furthermore, a start or stop condition can occur at
any time, and partially transferred bytes are discarded.
For an I2C data write transfer containing multiple data bytes,
the peripheral drives a no acknowledge for the data byte that
follows a write to Register 0x234, thereby ending the I2C transfer.
For an I2C data read transfer containing multiple data bytes,
the peripheral drives data bytes of 0x00 for subsequent reads that
follow a read from Register 0x234.
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