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參數(shù)資料
| 型號(hào)： | DS3903 |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | Triple 128-Position Nonvolatile Digital Potentiometer |
| 中文描述： | 三路、128抽頭、非易失數(shù)字電位器 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 619K |
| 代理商： | DS3903 |
D
Triple 128-Position Nonvolatile
Digital Potentiometer
_____________________________________________________________________
9
write process t
w
to the EEPROM memory. All inputs are
disabled during this write cycle.
The DS3903 is capable of an 8-byte page write. A page
write is initiated the same way as a byte write, but the
master does not send a stop condition after the first
data byte. Instead, after the slave acknowledges the
data byte has been received, the master can send up
to seven more data bytes using the same nine-clock
sequence. After a write to the last byte in the page, the
address returns to the beginning of the same page.
The master must then terminate the write cycle with a
stop condition or the data clocked into the DS3903 is
not latched into EEPROM. Note that in order for eight
bytes to be stored sequentially (and to prevent looping
around), the address byte must be set to the beginning
of the desired page (three LSBs of the address are 0).
For detailed information concerning page operations,
see the
Potentiometer Memory Organization
section.
Acknowledge Polling
Once the internally timed write has started and the
DS3903 inputs are disabled, acknowledge polling can
be initiated. The process involves transmitting a start
condition followed by the device address. The R/W bit
signifies the type of operation that is desired. The read
or write sequence is only allowed to proceed if the
internal write cycle has completed and the DS3903
responds with a zero.
Read Operations
After receiving a matching address byte with the R/W bit
set high, the device goes into the read mode of opera-
tion. There are three read operations: current address
read, random read, and sequential address read.
Current Address Read
The DS3903 has an internal address register that main-
tains the address used during the last read or write
operation, incremented by one. This data is maintained
as long as V
CC
is valid. If the most recent address was
the last byte in memory, then the register resets to the
first address. This address stays valid between opera-
tions as long as power is available.
Once the device address is clocked in and acknowl-
edged by the DS3903 with the R/W bit set to high, the
current address data word is clocked out. The master
does not respond with a zero, but does generate a stop
condition afterwards.
Random Address Read
A random read requires a dummy byte write sequence
to load in the data word address. Once the device
address and data address bytes are clocked in by the
master, and acknowledged by the DS3903, the master
must generate another start condition. The master now
initiates a current address read by sending the device
address with the R/W bit set high. The DS3903
acknowledges the device address and serially clocks
out the data byte.
Sequential Address Read
Sequential reads are initiated by either a current
address read or a random address read. After the mas-
ter receives the first data byte, the master responds
with an acknowledge. As long as the DS3903 receives
this acknowledge after a byte is read, the master can
clock out additional data words from the DS3903. After
reaching address FFh, it resets to address 00h.
The sequential read operation is terminated when the
master initiates a stop condition. The master does not
respond with a zero.
For a more detailed description of 2-wire theory of
operation, see the following section.
2-Wire Serial Port Operation
The 2-wire serial port interface supports a bidirectional
data transmission protocol with device addressing. A
device that sends data on the bus is defined as a trans-
mitter, and a device receiving data as a receiver. The
device that controls the message is called a “master.”
The devices that are controlled by the master are
“slaves.” The bus must be controlled by a master
device that generates the serial clock (SCL), controls
the bus access, and generates the start and stop con-
ditions. The DS3903 operates as a slave on the 2-wire
bus. Connections to the bus are made through the
open-drain I/O lines, SDA and SCL. The following I/O
terminals control the 2-wire serial port: SDA, SCL, and
A0. Timing diagrams for the 2-wire serial port can be
found in Figures 2 and 3. Timing information for the 2-
wire serial port is provided in the
AC Electrical
Characteristics
table
for 2-wire serial communications.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS3903E | 功能描述:IC POT NV TRIPLE 128POS 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 接片:32 電阻（歐姆）:50k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 50 ppm/°C 存儲(chǔ)器類型:易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 細(xì)型，TSOT-23-6 供應(yīng)商設(shè)備封裝:TSOT-23-6 包裝:帶卷 (TR) |
| DS3903E+ | 制造商:Maxim Integrated Products 功能描述:DGTL POTENTIOMETER 128POS 10.5KOHM/90KOHM TRIPLE 20TSSOP - Rail/Tube |
| DS3903E-020 | 功能描述:數(shù)字電位計(jì) IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS3903E-020/R | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Triple 128-Position Nonvolatile Digital Potentiometer |
| DS3903E-020/T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Triple 128-Position Nonvolatile Digital Potentiometer |
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