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參數(shù)資料
| 型號： | MAX5419NETA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23 |
| 中文描述： | 200K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, DSO8 |
| 封裝： | 3 X 3 MM, TDFN-8 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 796K |
| 代理商： | MAX5419NETA |
M
256-Tap, Nonvolatile, I
2
C-Interface,
Digital Potentiometers
_______________________________________________________________________________________
9
Analog Circuitry
The MAX5417/MAX5418/MAX5419 consist of a resistor
array with 255 resistive elements; 256 tap points are
accessible to the wiper, W, along the resistor string
between H and L. The wiper tap point is selected by
programming the potentiometer through the 2-wire (I
2
C)
interface. Eight data bits, an address byte, and a con-
trol byte program the wiper position. The H and L termi-
nals of the MAX5417/MAX5418/MAX5419 are similar to
the two end terminals of a mechanical potentiometer.
The MAX5417/MAX5418/MAX5419 feature power-on
reset circuitry that loads the wiper position from non-
volatile memory at power-up.
Digital Interface
The MAX5417/MAX5418/MAX5419 feature an internal,
nonvolatile EEPROM that stores the wiper state for ini-
tialization during power-up. The shift register decodes
the control and address bits, routing the data to the
proper memory registers. Data can be written to a
volatile memory register, immediately updating the
wiper position, or data can be written to a nonvolatile
register for storage.
The volatile register retains data as long as the device
is powered. Once power is removed, the volatile regis-
ter is cleared. 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.
Serial Addressing
The MAX5417/MAX5418/MAX5419 operate as a slave
that receives data through an I
2
C- and SMBus-com-
patible 2-wire interface. The interface uses a serial data
access (SDA) line and a serial clock line (SCL) to
achieve communication between master(s) and
slave(s). A master, typically a microcontroller, initiates
all data transfers to the MAX5417/MAX5418/MAX5419,
and generates the SCL clock that synchronizes the
data transfer (Figure 1).
The MAX5417/MAX5418/MAX5419 SDA line operates
as both an input and an open-drain output. A pullup
resistor, typically 4.7k
, is required on the SDA bus.
The MAX5417/MAX5418/MAX5419 SCL operates only
as an input. A pullup resistor, typically 4.7k
, is
required on the SCL bus if there are multiple masters
on the 2-wire interface, or if the master in a single-mas-
ter system has an open-drain SCL output.
Each transmission consists of a START (S) condition
(Figure 3) sent by a master, followed by the
MAX5417/MAX5418/MAX5419 7-bit slave address plus
the 8th bit (Figure 4), 1 command byte (Figure 7) and 1
data byte, and finally a STOP (P) condition (Figure 3).
Start and Stop Conditions
Both SCL and SDA remain high when the interface is
not busy. A master signals the beginning of a transmis-
sion with a START condition by transitioning SDA from
high to low while SCL is high. When the master has fin-
ished communicating with the slave, it issues a STOP
condition by transitioning the SDA from low to high
while SCL is high. The bus is then free for another
transmission (Figure 3).
Bit Transfer
One data bit is transferred during each clock pulse.
The data on the SDA line must remain stable while SCL
is high (Figure 5).
SDA
START
CONDITION
SCL
S
STOP
CONDITION
P
Figure 3. Start and Stop Conditions
SDA
SCL
*See the
Ordering Information/Selector Guide
section for other address options.
0
1
A0
MSB
LSB
NOP/W
ACK
0
1
0*
0*
Figure 4. Slave Address
SMBus is a trademark of Intel Corporation.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5419NETA+ | 制造商:Maxim Integrated Products 功能描述:DGTL POTENTIOMETER 256POS 200KOHM SGL 8TDFN EP - Rail/Tube |
| MAX5419NETA+T | 功能描述:數(shù)字電位計 IC 256-Tap Nonvolatile 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 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| MAX5419NETA-T | 功能描述:數(shù)字電位計 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 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| MAX5419PETA | 制造商:Maxim Integrated Products 功能描述:256-TAP NONVOLATILE I2C-INTERFACE - Rail/Tube |
| MAX5419PETA+ | 制造商:Maxim Integrated Products 功能描述:DGTL POTENTIOMETER 256POS 200KOHM SGL 8TDFN EP - Rail/Tube |
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