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參數(shù)資料
| 型號(hào)： | MAX5477EUD |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| 中文描述： | 10K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO14 |
| 封裝： | 4.40 X 5 MM, MO-153AB-1, TSSOP-14 |
| 文件頁(yè)數(shù)： | 9/15頁(yè) |
| 文件大?。?/td> | 383K |
| 代理商： | MAX5477EUD |
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M
Dual, 256-Tap, Nonvolatile, I
2
C-Interface,
Digital Potentiometers
_______________________________________________________________________________________
9
A simple 2-wire I
2
C-compatible serial interface moves
the wiper among the 256 tap points (Figure 2). A non-
volatile memory stores the wiper position and recalls
the stored wiper position upon power-up. The non-
volatile memory is guaranteed for 50 years for wiper
data retention and up to 200,000 wiper store cycles.
Analog Circuitry
The MAX5477/MAX5478/MAX5479 consist of two resistor
arrays with 255 resistive elements; 256 tap points are
accessible to the wipers, along the resistor string
between H_ and L_. The wiper tap point is selected by
programming the potentiometer through the I
2
C inter-
face. An address byte, a command byte, and 8 data bits
program the wiper position for each potentiometer. The
H_ and L_ terminals of the MAX5477/MAX5478/
MAX5479 are similar to the two end terminals of a
mechanical potentiometer. The MAX5477/MAX5478/
MAX5479 feature power-on reset circuitry that loads the
wiper position from the nonvolatile memory at power-up.
Digital Interface
The MAX5477/MAX5478/MAX5479 feature an internal,
nonvolatile EEPROM that stores the wiper state for ini-
tialization during power-up. The shift register decodes
the command and address bytes, routing the data to
the proper memory registers. Data written to a volatile
memory register immediately updates the wiper posi-
tion, or writes data to a nonvolatile register for storage
(see Table 2).
The volatile register retains data as long as the device
is powered. Removing power clears the volatile regis-
ter. The nonvolatile register retains data even after
power is removed. Upon power-up, the power-on reset
circuitry controls the transfer of data from the non-
volatile register to the volatile register.
A write-protect feature prevents accidental overwriting
of the EEPROM. Connect WP to V
DD
or leave open to
prevent any EEPROM write cycles. The wiper register
only updates with the value in the EEPROM when WP =
SDA
SCL
S
START
CONDITION
P
STOP
CONDITION
Figure 3. Start and Stop Conditions
MSB
START
SCL
SDA
ACK
A0
A2
A1
1
0
1
0
LSB
NOP/W
Figure 4. Slave Address
256-POSITION
DECODER
H_
L_
R
255
S
255
S
254
S
3
S
2
S
1
S
256
R
254
R
2
R
1
W_
R
W
WIPER
CODE 02h
Figure 2. Potentiometer Configuration
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX5479ETE | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| MAX5478 | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| MAX5478ETE | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| MAX5478EUD | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
| MAX5479 | Dual, 256-Tap, Nonvolatile, I2C-Interface, Digital Potentiometers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5477EUD+ | 功能描述:數(shù)字電位計(jì) IC Dual 256-Tap NV I2C-Interface 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 |
| MAX5477EUD+T | 功能描述:數(shù)字電位計(jì) IC Dual 256-Tap NV I2C-Interface 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 |
| MAX5477EUD-T | 制造商:Maxim Integrated Products 功能描述:DUAL, 256-TAP, NONVOLATILE, I2C-INTERFACE, DI - Tape and Reel |
| MAX5478ETD | 制造商:Maxim Integrated Products 功能描述:DUAL, 256-TAP, NONVOLATILE, I2C-INTERFACE, DI - Rail/Tube |
| MAX5478ETE | 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 |
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