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參數(shù)資料
| 型號： | AD9985AKSTZ-140 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 其它接口 |
| 英文描述： | 110 MSPS/140 MSPS Analog Interface for Flat Panel Displays |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PQFP80 |
| 封裝： | LEAD FREE, MS-026-BEC, PLASTIC, LQFP-80 |
| 文件頁數(shù)： | 26/32頁 |
| 文件大?。?/td> | 344K |
| 代理商： | AD9985AKSTZ-140 |
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AD9985A
2-WIRE SERIAL CONTROL PORT
A 2-wire serial interface control interface is provided. Two
AD9985A devices can be connected to the 2-wire serial
interface; each device has a unique address.
The 2-wire serial interface comprises a clock (SCL) and a
bidirectional data (SDA) pin. The analog flat panel interface
acts as a slave for receiving and transmitting data over the serial
interface. When the serial interface is not active, the logic levels
on SCL and SDA are pulled high by external pull-up resistors.
Data received or transmitted on the SDA line must be stable for
the duration of the positive-going SCL pulse. Data on SDA must
change only when SCL is low. If SDA changes state while SCL is
high, the serial interface interprets that action as a start or stop
sequence.
Rev. 0 | Page 26 of 32
The components to serial bus operation are
Start signal
Slave address byte
Base register address byte
Data byte to read or write
Stop signal
When the serial interface is inactive (SCL and SDA are high),
communications are initiated by sending a start signal. The start
signal is a high-to-low transition on SDA while SCL is high.
This signal alerts all slave devices that a data transfer sequence
is coming.
The first eight bits of data transferred after a start signal com-
prise a 7-bit slave address (the first seven bits) and a single R/W
bit (the eighth bit). The R/W bit indicates the direction of data
transfer, read from (1) or write to (0) the slave device. If the
transmitted slave address matches the address of the device (set
by the state of the SA1-0 input pins in Table 45), the AD9985A
acknowledges by bringing SDA low on the ninth SCL pulse. If
the addresses do not match, the AD9985A does not acknowledge.
Table 45. Serial Port Addresses
Bit 7
A
6
(MSB)
1
0
0
1
1
0
0
1
Bit 6
A
5
Bit 5
A
4
Bit 4
A
3
Bit 3
A
2
Bit 2
A
1
Bit 1
A
0
1
1
0
0
0
1
DATA TRANSFER VIA SERIAL INTERFACE
For each byte of data read or written, the MSB is the first bit of
the sequence.
If the AD9985A does not acknowledge the master device during
a write sequence, the SDA remains high so the master can
generate a stop signal. If the master device does not acknowl-
edge the AD9985A during a read sequence, the AD9985A
interprets this as end-of-data. The SDA remains high so the
master can generate a stop signal.
Writing data to specific control registers of the AD9985A
requires that the 8-bit address of the control register of interest
be written after the slave address has been established. This
control register address is the base address for subsequent write
operations. The base address auto-increments by one for each
byte of data written after the data byte intended for the base
address.
Data is read from the control registers of the AD9985A in a
similar manner. Reading requires two data transfer operations:
The base address must be written with the R/W bit of the slave
address byte low to set up a sequential read operation.
Reading (the R/W bit of the slave address byte high) begins at
the previously established base address. The address of the read
register auto-increments after each byte is transferred.
To terminate a read/write sequence to the AD9985A, a stop
signal must be sent. A stop signal comprises a low-to-high
transition of SDA while SCL is high.
A repeated start signal occurs when the master device driving
the serial interface generates a start signal without first generat-
ing a stop signal to terminate the current communication. This
is used to change the mode of communication (read, write)
between the slave and master without releasing the serial
interface lines.
SDA
SCL
t
BUFF
t
STAH
t
DHO
t
DSU
t
DAL
t
DAH
t
STASU
t
STOSU
0
Figure 12. Serial Port Read/Write Timing
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| AD9985BST-110 | 制造商:Analog Devices 功能描述:110 MSPS/140 MSPS ANLG INTRFC FOR FLAT PNL DISPLAYS 80LQFP - Bulk |
| AD9985BSTZ-110 | 功能描述:IC INTERFACE 8BIT 110MSPS 80LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 特色產(chǎn)品:NXP - I2C Interface 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:2 通道 I²C 多路復(fù)用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
| AD9985KST-110 | 制造商:Analog Devices 功能描述:110 MSPS/140 MSPS ANLG INTRFC FOR FLAT PNL DISPLAYS 80LQFP - Bulk |
| AD9985KSTZ-110 | 功能描述:IC INTERFACE 8BIT 110MSPS 80LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 特色產(chǎn)品:NXP - I2C Interface 標(biāo)準(zhǔn)包裝:1 系列:- 應(yīng)用:2 通道 I²C 多路復(fù)用器 接口:I²C，SM 總線 電源電壓:2.3 V ~ 5.5 V 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:剪切帶 (CT) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:825 (CN2011-ZH PDF) 其它名稱:568-1854-1 |
| AD9985KSTZ-140 | 功能描述:IC INTERFACE 8BIT 140MSPS 80LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2 |
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