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參數(shù)資料
| 型號(hào)： | DS3904U-020 |
| 英文描述： | Triple 128-Position Nonvolatile Digital Variable Resistor/Switch |
| 中文描述： | 三128位置非易失數(shù)字可變電阻/開關(guān) |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 254K |
| 代理商： | DS3904U-020 |
D
Triple 128-Position Nonvolatile Digital
Variable Resistor/Switch
_____________________________________________________________________
7
Detailed Description
The DS3904/DS3905 contain three, 128-position, NV,
low temperature coefficient, variable digital resistors.
They are controlled through a 2-wire serial interface,
and can serve as a low-cost replacement for designs
using conventional trimming resistors. Furthermore, the
DS3904 address pin (A0) allows two DS3904s to be
placed on the same 2-wire bus. The three address pins
on the DS3905 allow up to eight DS3905s to be placed
on the same 2-wire bus.
With their low cost and small size, the DS3904/DS3905
are well tailored to replace larger mechanical trimming
variable resistors. This allows the automation of calibra-
tion in many instances because the 2-wire interface can
easily be adjusted by test/production equipment.
Variable Resistor Memory Organization
The variable resistors of the DS3904/DS3905 are
addressed by communicating with the registers in
Table 1.
Using the Resistor as a Switch
By taking advantage of the high-impedance mode, a
switch can be created to produce a digital output.
Setting a resistor register to 00h creates the low state.
Writing 80h into the same resistor register enables the
high-impedance state. When used with an external
pullup resistor, such as a 4.7k
pullup, a high state
is generated.
Device Operation
Clock and Data Transitions
The SDA pin is normally pulled high with an external
resistor or device. Data on the SDA pin can only change
during SCL low time periods. Data changes during SCL
high periods indicate a start or stop condition depend-
ing on the conditions discussed below. See the timing
diagrams for further details (Figures 2 and 3).
Start Condition
A high-to-low transition of SDA with SCL high is a start
condition, which must precede any other command. See
the timing diagrams for further details (Figures 2 and 3).
Stop Condition
A low-to-high transition of SDA with SCL high is a stop
condition. After a read or write sequence, the stop com-
mand places the DS3904/DS3905 into a low-power
mode. See the timing diagrams for further details
(Figures 2 and 3).
Acknowledge
All address and data bytes are transmitted through a
serial protocol. The DS3904/DS3905 pull the SDA line
low during the ninth clock pulse to acknowledge that
they have received each byte.
Standby Mode
The DS3904/DS3905 feature a low-power mode that is
automatically enabled after power-on, after a stop com-
mand, and after the completion of all internal operations.
Pin Description
PIN
NAME
DS3904
DS3905
DESCRIPTION
SDA
1
2
2-Wire Serial Data. Open-drain
input/output for 2-wire data.
SCL
2
3
2-Wire Serial Clock. Input for
2-wire clock.
V
CC
GND
H2
H1
H0
A0
A1
A2
3
4
5
6
7
8
—
—
4
5
6
7
8
9
1
10
Supply Voltage Terminal
Ground Terminal
Resistor 2 High Terminals
Resistor 1 High Terminals
Resistor 0 High Terminals
Address-Select Pin
Ad d ess- S el ect P n ( D S 3905 Onl y)
Ad d ess- S el ect P n ( D S 3905 Onl y)
Table 1. Variable Resistor Registers
ADDRESS
VARIABLE
RESISTOR
POSITION 7Fh
RESISTANCE
NUMBER OF
POSITIONS*
F8h
Resistor 0
20k
(nominal)
128 (00h to
7Fh) + Hi-Z
F9h
Resistor 1
20k
(nominal)
128 (00h to
7Fh) + Hi-Z
FAh
Resistor 2
20k
(nominal)
128 (00h to
7Fh) + Hi-Z
*
Writing a value greater than 7Fh to any of the resistor registers
sets the high-impedance mode control bit (RHIZ, the MSB of
the resistor register) resulting in the resistor going into high-
impedance mode. Position 0 is the minimum position. Position
127 is the maximum position.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS3904U-020/T&R | 制造商:Maxim Integrated Products 功能描述:TRIPLE NON VOLATILE DIGITAL RESISTO - Tape and Reel |
| DS3904U-020/T&R | 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 |
| DS3904U-020+ | 功能描述:數(shù)字電位計(jì) IC Triple 128-Position Nonvolatile 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 |
| DS3904U-020+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR |
| DS3904U-020+T&R | 制造商:Maxim Integrated Products 功能描述:TRIPLE NV DIG RES LEAD FREE T&R 制造商:Maxim Integrated Products 功能描述:DGTL POTENTIOMETER 128POS 20KOHM TRIPLE 8USOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC POT NV TRIPLE 128POS 8-USOP 制造商:Maxim Integrated Products 功能描述:Digital Potentiometer ICs Triple 128-Position Nonvolatile |
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