MAXIM MAX5417, 5418, 5419 User Manual

19-3185; Rev 2; 8/04

________________________________

MAX5417/MAX5418/MAX5419

是非易失、线性数字电位

概述

器，与机械电位器功能相似，但可通过简单的2线数字接
口控制，允许多个器件进行通信。每个器件具有分离电
位器或可变电阻的功能，具有

这些器件内置非易失

EEPROM

上电时进行初始化处理。快速模式

400kbps

的通信速率，在许多应用场合可有效减小电路板

个抽头点。

256

，用于存储滑动端的位置，

TM

兼容接口允许

I2C

面积，简化电路连接。每个器件有一个工厂预置地址，
有四种地址选择(见

选择指南

，配合地址选择输入，共

)

提供八个唯一的地址组合。

MAX5417/MAX5418/MAX5419
(MAX5417)、100kΩ (MAX5418)和200kΩ (MAX5419)

标称电阻的端到端温度系数为
为

5ppm/°C

，非常适合低温漂可变电阻的应用，如低漂移、

提供了三个标称阻值：

35ppm/°C,

比率温度系数仅

50kΩ

。

可编程增益放大器。

MAX5417/MAX5418/MAX5419

封装，工作在

TDFN

-40°C至+85°C

采用

3mmx 3mm、8

扩展级温度范围。

________________________________

引脚

应用

替代机械电位器

低漂移可编程增益放大器

音量控制

液晶显示屏

(LCD)

对比度控制

256

抽头、非易失、

I2C

接口

数字电位器

________________________________

上电后从非易失存储器调用滑动端位置

♦

微型

♦

♦

♦

♦

♦

♦ 500nA (

♦

♦ 256

♦

♦

3mm x 3mm、8

端到端电阻温度系数：
比率温度系数：
阻值：

50kΩ/100kΩ/200kΩ

快速

兼容串行接口

I2C

典型值)静态电流

单电源

+2.7V至+5.25V

抽头
分压模式下
分压模式下

DNL

INL为：±0.5 LSB

______________________________

定义的

8-BIT

SHIFT

REGISTER

I2C

INTERFACE

Philips I2C

标准规范的系统。

I2C

V

DD

GND

SDA
SCL

A

0

I2C是Philips Corp.

购买

Maxim Integrated Products, Inc.

产品，即得到了

Philips

引脚

TDFN

封装

35ppm/°C

5ppm/°C

供电

为：

±0.5 LSB

8

8-BIT

LATCH

POR

8-BIT

NV

MEMORY

的一个商标。

的专利许可、将这些产品用于符合

256-

8

POSITION
DECODER

MAX5417
MAX5418
MAX5419

或其从属授权公司的

功能图

256

特性

MAX5417/MAX5418/MAX5419

H

W

L

I2C

___________________________________________________________

PART TEMP RANGE I2C ADDRESS R (kΩ) PIN-PACKAGE TOP MARK

MAX5417LETA -40°C to +85°C 010100A

MAX5417META* -40°C to +85°C 010101A

MAX5417NETA* -40°C to +85°C 010110A

MAX5417PETA* -40°C to +85°C 010111A

MAX5418LETA -40°C to +85°C 010100A

MAX5418META* -40°C to +85°C 010101A

MAX5418NETA* -40°C to +85°C 010110A

MAX5418PETA* -40°C to +85°C 010111A

MAX5419LETA -40°C to +85°C 010100A

MAX5419META* -40°C to +85°C 010101A

MAX5419NETA* -40°C to +85°C 010110A

MAX5419PETA* -40°C to +85°C 010111A

*Future product—contact factory for availability.
**Exposed pad.

________________________________________________________________ Maxim Integrated Products 1

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翻译错误，如需确认任何词语的准确性，请参考

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Maxim

的主页：

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0

0

0

0

0

0

0

0

0

0

0

引脚配置见本文的最后部分。

www.maxim-ic.com.cn

50 8 TDFN-EP** AIB

50 8 TDFN-EP** ALS

50 8 TDFN-EP** ALT

50 8 TDFN-EP** ALU

100 8 TDFN-EP** AIC

100 8 TDFN-EP** ALV

100 8 TDFN-EP** ALW

100 8 TDFN-EP** ALX

200 8 TDFN-EP** AID

200 8 TDFN-EP** ALY

200 8 TDFN-EP** ALZ

200 8 TDFN-EP** AMA

。

定购信息/选择指南

256

抽头、非易失、

I2C

接口

数字电位器

ABSOLUTE MAXIMUM RATINGS

VDDto GND...........................................................-0.3V to +6.0V

All Other Pins to GND.................................-0.3V to (V

Maximum Continuous Current into H, L, and W

MAX5417......................................................................±1.3mA

MAX5418......................................................................±0.6mA

MAX5419......................................................................±0.3mA

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

DD

+ 0.3V)

Continuous Power Dissipation (T

8-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(VDD= +2.7V to +5.25V, H = VDD, L = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V, TA= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DC PERFORMANCE (VOLTAGE-DIVIDER MODE)

Resolution 256 Taps

Integral Nonlinearity INL (Note 1) ±0.5 LSB

Differential Nonlinearity DNL (Note 1) ±0.5 LSB

End-to-End Temperature
Coefficient

Ratiometric Temperature
Coefficient

MAX5417/MAX5418/MAX5419

Zero-Scale Error

DC PERFORMANCE (VARIABLE-RESISTOR MODE)

Integral Nonlinearity
(Note 2)

Differential Nonlinearity
(Note 2)

DC PERFORMANCE (RESISTOR CHARACTERISTICS)

Wiper Resistance R

Wiper Capacitance C

TC

INL

DNL

W

W

HL

R

MAX5417_, 50Ω -0.6

MAX5418_, 100kΩ -0.3Full-Scale Error

MAX5419_, 200kΩ -0.15

MAX5417_, 50kΩ 0.6

MAX5418_, 100kΩ 0.3
MAX5419_, 200kΩ 0.15

V

= 3V ±3

DD

V

= 5V ±1.5

DD

V

= 3V, MAX5417_, 50kΩ,

DD

guaranteed monotonic

VDD = 3V, MAX5418_, 100kΩ ±1

MAX5419_, 200kΩ ±1

V

= 5V ±1

DD

VDD = 3V to 5.25V (Note 3) 325 675 Ω

MAX5417_ 37.5 50 62.5

MAX5418_ 75 100 125End-to-End Resistance R

MAX5419_ 150 200 250

-1 +2

= +70°C)

A

35 ppm/°C

5 ppm/°C

10 pF

LSB

LSB

LSB

LSB

kΩ

2 _______________________________________________________________________________________

256

抽头、非易失、

I2C

接口

数字电位器

MAX5417/MAX5418/MAX5419

ELECTRICAL CHARACTERISTICS (continued)

(VDD= +2.7V to +5.25V, H = VDD, L = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V, TA= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DIGITAL INPUTS

Input High Voltage (Note 4) V

Input Low Voltage V

Low-Level Output Voltage V

Input Leakage Current I

Input Capacitance 5pF

DYNAMIC CHARACTERISTICS

NONVOLATILE MEMORY

Data Retention TA = +85°C 50 Years

Endurance

POWER SUPPLY

Power-Supply Voltage V

Standby Current I

Programming Current

LEAK

DD

DD

VDD = 3.4V to 5.25V 2.4

IH

VDD < 3.4V 0.7 x V

V

IL

OL

= 2.7V to 5.25V (Note 4) 0.8 V

DD

3mA sink current 0.4 V

MAX5417_ 100

MAX5418_ 50Wiper -3dB Bandwidth (Note 5)

MAX5419_ 25

TA = +25°C 200,000

= +85°C 50,000

T

A

Digital inputs = V

= +25°C

T

A

During nonvolatile write;
digital inputs = V

or GND,

DD

or GND (Note 6)

DD

DD

2.70 5.25 V

0.5 1 µA

200 400 µA

V

±1 µA

kHz

Stores

TIMING CHARACTERISTICS

(VDD= +2.7V to +5.25V, H = VDD, L = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V, TA=
+25°C. See Figures 1 and 2.) (Note 7)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ANALOG SECTION

MAX5417_ 500

ns

DIGITAL SECTION

SCL Clock Frequency f

Setup Time for START Condition t

Hold Time for START Condition t

CLK High Time t

CLK Low Time t

_______________________________________________________________________________________ 3

IL

SCL

SU-STA

HD-STA

HIGH

LOW

MAX5418_ 600Wiper Settling Time (Note 8) t

MAX5419_ 1000

400 kHz

0.6 µs

0.6 µs

0.6 µs

1.3 µs

256

抽头、非易失、

I2C

接口

数字电位器

TIMING CHARACTERISTICS (continued)

(VDD= +2.7V to +5.25V, H = VDD, L = GND, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VDD= +5V, TA=
+25°C. See Figures 1 and 2.) (Note 7)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Data Setup Time t

Data Hold Time t

SDA, SCL Rise Time t

SDA, SCL Fall Time t

Setup Time for STOP Condition t

Bus Free Time Between STOP
and START Condition

Pulse Width of Spike Suppressed t

Maximum Capacitive Load for
Each Bus Line

Write NV Register Busy Time t

Note 1: The DNL and INL are measured with the potentiometer configured as a voltage-divider with H = VDDand L = GND. The

Note 2: The DNL and INL are measured with the potentiometer configured as a variable resistor. H is unconnected and L = GND.

Note 3: The wiper resistance is measured using the source currents given in Note 2. For operation to V

Note 4: The device draws higher supply current when the digital inputs are driven with voltages between (V

MAX5417/MAX5418/MAX5419

Note 5: Wiper at midscale with a 10pF load (DC measurement). L = GND; an AC source is applied to H; and the W output is mea-

Note 6: The programming current operates only during power-up and NV writes.
Note 7: SCL clock period includes rise and fall times t

Note 8: Wiper settling time is the worst-case 0% to 50% rise time measured between consecutive wiper positions. H = VDD,

Note 9: An appropriate bus pullup resistance must be selected depending on board capacitance. Refer to the document linked to

Note 10: The idle time begins from the initiation of the stop pulse.

wiper terminal is unloaded and measured with a high-input-impedance voltmeter.

For the 5V condition, the wiper terminal is driven with a source current of 80µA for the 50kΩ configuration, 40µA for the
100kΩ configuration, and 20µA for the 200kΩ configuration. For the 3V condition, the wiper terminal is driven with a source
current of 40µA for the 50kΩ configuration, 20µA for the 100kΩ configuration, and 10µA for the 200kΩ configuration.

Resistance vs. Temperature in the Typical Operating Characteristics.

0.5V). See Supply Current vs. Digital Input Voltage in the Typical Operating Characteristics.

sured. A 3dB bandwidth occurs when the AC W/H value is 3dB lower than the DC W/H value.

from a voltage level of (V

L = GND, and the wiper terminal is unloaded and measured with a 10pF oscilloscope probe (see the Typical Operating
Characteristics for the tap-to-tap switching transient).

this web address: www.semiconductors.philips.com/acrobat/literature/9398/39340011.pdf.

SU-DAT

HD-DAT

SU-STO

+ VIH) / 2.

IL

R

F

t

BUF

SP

C

B

BUSY

Minimum power-up rate = 0.2V/ms 1.3 µs

(Note 9) 400 pF

(Note 10) 12 ms

and tF. All digital input signals are specified with tR= tF= 2ns and timed

R

100 ns

0 0.9 µs

300 ns

300 ns

0.6 µs

50 ns

= 2.7V, see Wiper

DD

- 0.5V) and (GND +

DD

4 _______________________________________________________________________________________

WIPER TRANSIENT AT POWER-ON

MAX5417 toc04

W
1V/div

V

DD

2V/div

4µs/div

CL = 10pF
TAP = 128
H = V

DD

END-TO-END RESISTANCE % CHANGE

vs. TEMPERATURE

MAX5417 toc05

TEMPERATURE (°C)

END-TO-END RESISTANCE % CHANGE

603510-15

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1.0

-1.0

-40 85

DNL vs. TAP POSITION

MAX5417 toc01

TAP POSITION

RESISTANCE DNL (LSB)

224192160128966432

-0.20

-0.15

-0.10

-0.05

0

0.10

0.20

0.05

0.15

0.25

-0.25
0256

VOLTAGE-DIVIDER MODE

TAP POSITION

RESISTANCE INL (LSB)

224192160128966432

-0.20

-0.15

-0.10

-0.05

0

0.10

0.20

0.05

0.15

0.25

-0.25
0 256

INL vs. TAP POSITION

MAX5417 toc02

VOLTAGE-DIVIDER MODE

WIPER RESISTANCE vs. TAP POSITION

MAX5417 toc03

TAP POSITION

RESISTANCE (Ω)

224192160128966432

100

200

300

400

500

600

700

0

0 256

VDD = 2.7V
I

SRC

= 50µA

STANDBY SUPPLY CURRENT

vs. TEMPERATURE

MAX5417 toc06

TEMPERATURE (°C)

STANDBY SUPPLY CURRENT (µA)

603510-15

0.2

0.4

0.6

0.8

1.0

0

-40 85

WIPER RESISTANCE vs. TEMPERATURE

MAX5417 toc07

TEMPERATURE (°C)

RESISTANCE (Ω)

603510-15

100

200

300

400

500

600

700

0

-40 85

VDD = 2.7V

VDD = 3.0V

VDD = 4.5V

VDD = 5.25V

256

抽头、非易失、

数字电位器

_______________________________________________________________

(VDD= +5V, TA= +25°C, unless otherwise noted.)

I2C

接口

典型工作特性

MAX5417/MAX5418/MAX5419

_______________________________________________________________________________________ 5

SUPPLY CURRENT

vs. DIGITAL INPUT VOLTAGE

MAX5417 toc08

DIGITAL INPUT VOLTAGE (V)

SUPPLY CURRENT (µA)

4321

100

200

300

400

500

600

0

05

10k1k100

0.001

0.01

0.1

1

10

100

0.0001
10 100k

THD+N RESPONSE

MAX5417 toc09

FREQUENCY (Hz)

THD+N (%)

1:1 RATIO
20Hz TO 20kHz BANDPASS

INL vs. TAP POSITION

(MAX5417)

MAX5417 toc10

TAP POSITION

RESISTANCE INL (LSB)

224192160128966432

-0.5

0

0.5

1.0

1.5

2.0

2.5

3.0

-1.0
0256

VARIABLE-RESISTOR MODE
V

DD

= 2.7V

I

SRC

= 50µA

256

抽头、非易失、

数字电位器

I2C

接口

___________________________________________________________

(VDD= +5V, TA= +25°C, unless otherwise noted.)

INL vs. TAP POSITION

(MAX5418)

2.0

VARIABLE-RESISTOR MODE

= 2.7V

V

DD

1.5

= 20µA

I

SRC

1.0

MAX5417/MAX5418/MAX5419

0.5

INL (LSB)

0

-0.5

-1.0
0256

TAP POSITION

MAX5417 toc11

224192160128966432

1.00

0.75

0.50

0.25

0

INL (LSB)

-0.25

-0.50

-0.75

-1.00

INL vs. TAP POSITION

VARIABLE-RESISTOR MODE

= 2.7V

V

DD

= 10µA

I

SRC

0256

(MAX5419)

TAP POSITION

典型工作特性(续

MAX5417 toc12

22419232 64 96 128 160

)

DNL vs. TAP POSITION

(MAX5417)

0.5
VARIABLE-RESISTOR MODE

0.4

0.3

6 _______________________________________________________________________________________

0.2

0.1

DNL (LSB)

0

-0.1

-0.2

-0.3
0256

TAP POSITION

DNL vs. TAP POSITION

(MAX5418)

0.3

VARIABLE-RESISTOR MODE

= 2.7V

V

DD

MAX5417 toc13

224192160128966432

0.2

= 20µA

I

SRC

0.1

0

DNL (LSB)

-0.1

-0.2

-0.3
0 256

TAP POSITION

MAX5417 toc14

224192160128966432

256

抽头、非易失、

___________________________________________________________

(VDD= +5V, TA= +25°C, unless otherwise noted.)

I2C

接口

数字电位器

典型工作特性(续

MAX5417/MAX5418/MAX5419

)

0.3
VARIABLE-RESISTOR MODE
V

DD

0.2
I

SRC

0.1

0

DNL (LSB)

-0.1

-0.2

-0.3

DNL vs. TAP POSITION

(MAX5419)

= 2.7V
= 10µA

TAP POSITION

MAX5417 toc15

22419232 64 96 128 1600 256

MIDSCALE WIPER RESPONSE vs. FREQUENCY

(MAX5419)

0

-5
MAX5419

-10
TAP = 128

-15

-20

-25

-30

WIPER RESPONSE (dB)

-35

-40

-45

1 1000

CL = 50pF

FREQUENCY (kHz)

CL = 10pF

10010

MIDSCALE WIPER RESPONSE vs. FREQUENCY

MIDSCALE WIPER RESPONSE vs. FREQUENCY

(MAX5417)

0

MAX5417
TAP = 128

-5

-10

-15

-20

WIPER RESPONSE (dB)

-25

-30
11000

FREQUENCY (kHz)

CL = 10pF

CL = 50pF

10010

MAX5417 toc16

0

MAX5418
TAP = 128

-5

-10

-15

-20

WIPER RESPONSE (dB)

-25

-30
1 1000

TAP-TO-TAP SWITCHING TRANSIENT

(MAX5417)

MAX5417 toc18

MAX5417
C

L

FROM TAP 127
TO TAP 128
H = V

1µs/div

(MAX5418)

FREQUENCY (kHz)

MAX5417 toc19

= 10pF

DD

CL = 50pF

10010

SDA
2V/div

W
10mV/div

CL = 10pF

MAX5417 toc17

TAP-TO-TAP SWITCHING TRANSIENT

(MAX5418)

1µs/div

MAX5417 toc20

MAX5418

= 10pF

C

L

FROM TAP 127
TO TAP 128
H = V

DD

SDA
2V/div

W
10mV/div

TAP-TO-TAP SWITCHING TRANSIENT

(MAX5419)

1µs/div

MAX5417 toc21

MAX5419

= 10pF

C

L

FROM TAP 127
TO TAP 128
H = V

DD

SDA
2V/div

W
10mV/div

_______________________________________________________________________________________ 7

256

抽头、非易失、

数字电位器

I2C

接口

___________________________________________________________________

功能

电容旁路

t

HD-STA

至

GND

。

t

SU-STO

V

DD

t

SU-DAT

名称

t

LOW

t

HD-STA

电源输入，电压范围：

接口时钟输入

I2C

接口数据输入

I2C

地址输入端，设置器件ID的A0位。
地
低端
滑动端
高端
裸露焊盘

t

HIGH

t

R

t

F

2.7V至5.25V。用0.1µF

t

HD-DAT

t

SU-STA

引脚

PIN NAME FUNCTION

1VDDPower-Supply Input. 2.7V to 5.25V voltage range. Bypass with a 0.1µF capacitor from VDD to GND.

2 SCL I2C-Interface Clock Input

3 SDA I2C-Interface Data Input

4 A0 Address Input. Sets the A0 bit in the device ID address.

5 GND Ground

6 L Low Terminal

7 W Wiper Terminal

8 H High Terminal

— EP Exposed Pad

SDA

SCL

MAX5417/MAX5418/MAX5419

S Sr A

PARAMETERS ARE MEASURED FROM 30% TO 70%.

引脚说明

t

R

PS

t

F

t

BUF

图

1. I2C

串行接口时序

____________________________

V

DD

I

= 3mA

OL

MAX5417/MAX5418/MAX5419

个电阻单元。
端到端阻值为

MAX5417

100kΩ，MAX5417

端到端阻值为

MAX5417/MAX5418/MAX5419

SDA

V

OUT

400pF

= 0mA

I

OH

动端可以构成标准的分压器，H、L和W端可以任意配置，
只需保证各端电压在

简单的2线

I2C

GND和V

兼容串行接口可以在
动端。非易失存储器储存并在上电时恢复滑动端的位置。
非易失存储器确保

200,000

持50年。

图

负载电路

2.

8 _______________________________________________________________________________________

内置电阻阵列，包含

端到端阻值为

通过连接高端、低端和滑

之间。

DD

次抽头读写，寄存器数据可保

详细说明

50kΩ，MAX5418

200kΩ

个触点间调节滑

256

255

。

模拟电路

MAX5417/MAX5418/MAX5419

个电阻单元；

255

串接至滑动端
口对数字电位器编程实现。8位数据，一个地址字节，和
一个控制字节设置抽头位置。

MAX5419的H、L
MAX5417/MAX5418/MAX5419

电时从非易失存储器自动装载滑动端的位置。

个抽头点可以沿着H、L之间的电阻

256

。滑动端的位置选择通过2线

(W)

端与机械电位器的两个端点相同。

内置一个电阻阵列，包含

接

(I2C)

MAX5417/MAX5418/

带有上电复位电路，在上

数字接口

MAX5417/MAX5418/MAX5419

用于存储滑动端的位置，以便上电时的初始化处理。移
位寄存器对控制位和地址位进行解码，将数据写入适当
的数据寄存器。数据可以写入易失存储寄存器，立即更
新滑动端的位置，也可以写入非易失寄存器存储。

易失寄存器在系统加电期间能够保持数据。一旦系统断
电，易失寄存器的内容被清除。非易失寄存器在系统断
电时仍能保存数据。一旦上电，上电复位电路将非易失
存储器的内容自动传送到易失寄存器中，更新滑动端的
位置。

内置非易失

EEPROM

256

抽头、非易失、

I2C

数字电位器

MAX5417/MAX5418/MAX5419

TM

SMBus
(SDA)

主设备通常是微控制器，启动

MAX5419

传输(见图1)。

MAX5417/MAX5418/MAX5419的SDA

开路输出，

MAX5417/MAX5418/MAX5419的SCL

若2线接口挂接有多个主机，或者是具有
出的单主机系统，

，

阻。

每次数据传输先由主机发送启动
然后发送

8位(图4)，1

停止

接口不工作时
始数据传输，即
降沿。当主机完成与从机的通信后发送停止条件，即在

SCL

总线，进行另外的传输(图3)。

兼容的2线接口接收数据，该接口采用串行数据线

和串行时钟线

的全部数据传输，并产生

线上需要一个典型值为

SDA

SCL

MAX5417/MAX5418/MAX5419的7

个命令字节(图7)和1个数据字节，最后是

(STOP)

为高电平时

条件

(P) (图3)

SCL和SDA

SCL

SDA

实现主、从设备之间的通信。

(SCL)

线上需接典型值为

。

均为高。主机发送启动条件开

为高电平时

出现由低至高的上升沿。然后释放

作为从设备从

MAX5417/MAX5418/

时钟，同步数据

SCL

可作为输入或漏极

4.7kΩ

只能作为输入端。

SCL

4.7kΩ

(START)

条件

启动条件和停止条件

出现由高至低的下

SDA

接口

串行寻址

或

I2C

的上拉电阻。

漏极开路输

的上拉电

(S) (图3)

位从地址和第

MAX5417/MAX5418/MAX5419

，

SDA

SCL

S

START

CONDITION

图

启动条件和停止条件

3.

SDA

SCL

*See the Ordering Information/Selector Guide section for other address options.

图

4.

SMBus是Intel Corporation

01

MSB LSB

从地址

的一个商标。

_______________________________________________________________________________________ 9

0 1 0* 0*

P

STOP

CONDITION

每个时钟传输一个数据位。
需保持稳定(图5)。

A0

为高时，

SCL

NOP/W ACK

上的数据必

SDA

位传输

256

抽头、非易失、

数字电位器

I2C

接口

表1.

应答位是第9个时钟位，它是收到每个数据字节的应答握
手信号(图6)。因此，每个字节的有效传输需要9位。主
机产生第9个时钟脉冲，接收端在应答时钟周期内将

低电平。当主机向
据时，
为它们是数据的接收者。

MAX5417/MAX5418/MAX5419

PART SUFFIX A6 A5 A4 A3 A2 A1 A0 NOP/W

L 0 1 0 1 0 0 0 NOP/W

L 0 1 0 1 0 0 1 NOP/W
M 0 1 0 1 0 1 0 NOP/W
M 0 1 0 1 0 1 1 NOP/W
N 0 1 0 1 1 0 0 NOP/W
N 0 1 0 1 1 0 1 NOP/W

P 0 1 0 1 1 1 0 NOP/W

P 0 1 0 1 1 1 1 NOP/W

拉低，所以，在时钟为高电平期间

SDA

MAX5417/MAX5418/MAX5419

MAX5417/MAX5418/MAX5419

产生应答信号，因

必须稳定在

SDA

的地址码

ADDRESS BYTE

应答信号

传输数

MAX5417/MAX5418/MAX5419
MAX5417/MAX5418/MAX5419

接下来的2位由工厂设置(见表1)。将A0输入接

，可以在两个唯一地址中为器件选择做出选择。只

V

DD

有具有唯一地址的器件才能共享总线。因此，最多可以
有8个
线上。

从地址

MAX5417/MAX5418/MAX5419

MAX5417/MAX5418/MAX5419

紧随7位从地址的第8位是
示写操作，置高表示空操作。

具有7位从地址(图4)。

NOP/W

位，

NOP/W

位置低表

提供四种从地址(表1)。

的高4位地址始终为

MAX5417/MAX5418/MAX5419

0101

或

GND

挂接在同一总

，

SCL

SDA

图

START

CONDITION

应答信号

6.

1

289

NOT ACKNOWLEDGE

ACKNOWLEDGE

SDA

SCL

DATA STABLE,
DATA VALID

图

位传输

5.

10 ______________________________________________________________________________________

CHANGE OF
DATA ALLOWED

CLOCK PULSE FOR

ACKNOWLEDGMENT