參數(shù)資料
型號(hào)： MAX5418NETA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 數(shù)字電位計(jì)
英文描述： 32-Tap. Nonvolatile. Linear-Taper Digital Potentiometers in SOT23
中文描述： 100K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, DSO8
封裝： 3 X 3 MM, TDFN-8
文件頁(yè)數(shù)： 12/15頁(yè)
文件大?。?/td> 796K
代理商： MAX5418NETA
M
256-Tap, Nonvolatile, I
2
C-Interface,
Digital Potentiometers
12
______________________________________________________________________________________
ADDRESS BYTE
CONTROL BYTE
DATA BYTE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
P
SCL CYCLE
NUMBER
S
A6
0
0
0
0
A5
1
1
1
1
A4
0
0
0
0
A3
1
1
1
1
A2
A2
A2
A2
A2
A1
A1
A1
A1
A1
A0
A0
A0
A0
A0
ACK
TX
NV
0
1
1
0
V
1
0
0
1
R3
0
0
0
0
R2
0
0
0
0
R1
0
0
0
0
R0
1
1
1
1
ACK
D7
D7
D7
D7
D7
D6
D6
D6
D6
D6
D5
D5
D5
D5
D5
D4
D4
D4
D4
D4
D3
D3
D3
D3
D3
D2
D2
D2
D2
D2
D1
D1
D1
D1
D1
D0
D0
D0
D0
D0
ACK
VREG
NVREG
NVREGxVREG
VREGxNVREG
0
0
0
0
0
0
0
0
0
0
1
1
Table 2. Command Byte Summary
Nonvolatile Memory
The internal EEPROM consists of an 8-bit nonvolatile
register that retains the value written to it before the
device is powered down. The nonvolatile register is
programmed with the midscale value at the factory.
Power-Up
Upon power-up, the MAX5417/MAX5418/MAX5419
load the data stored in the nonvolatile memory register
into the volatile memory register, updating the wiper
position with the data stored in the nonvolatile memory
register. This initialization period takes 10μs.
Standby
The MAX5417/MAX5418/MAX5419 feature a low-power
standby. When the device is not being programmed, it
goes into standby mode and power consumption is
typically 500nA.
Applications Information
The MAX5417/MAX5418/MAX5419 are intended for cir-
cuits requiring digitally controlled adjustable resis-
tance, such as LCD contrast control (where voltage
biasing adjusts the display contrast), or for programma-
ble filters with adjustable gain and/or cutoff frequency.
Positive LCD Bias Control
Figures 9 and 10 show an application where the volt-
age-divider or variable resistor is used to make an
adjustable, positive LCD bias voltage. The op amp pro-
vides buffering and gain to the resistor-divider network
made by the potentiometer (Figure 9) or to a fixed
resistor and a variable resistor (see Figure 10).
Programmable Filter
Figure 11 shows the configuration for a 1st-order pro-
grammable filter. The gain of the filter is adjusted by
R2, and the cutoff frequency is adjusted by R3. Use the
following equations to calculate the gain (G) and the
3dB cutoff frequency (f
C
):
G
R
R
f
R
C
C
1
×
×
=
+
=
1
2
1
2
3
π
V
OUT
30V
5V
W
H
L
MAX5417
MAX5418
MAx5419
V
OUT
30V
5V
W
H
L
MAX5417
MAX5418
MAX5419
Figure 9. Positive LCD Bias Control Using a Voltage-Divider
Figure 10. Positive LCD Bias Control Using a Variable Resistor
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX5418NETA+ 制造商:Maxim Integrated Products 功能描述:DGTL POTENTIOMETER 256POS 100KOHM SGL 8TDFN EP - Rail/Tube
MAX5418NETA+T 功能描述:數(shù)字電位計(jì) 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(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
MAX5418NETA-T 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
MAX5418PETA 制造商:Maxim Integrated Products 功能描述:256-TAP NONVOLATILE 2-WIRE INTERF - Rail/Tube
MAX5418PETA+ 制造商:Maxim Integrated Products 功能描述:DGTL POTENTIOMETER 256POS 100KOHM SGL 8TDFN EP - Rail/Tube
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