Datasheet > DS1844S-050+

DS1844S-050+

更新时间： 2024-01-27 20:10:59

品牌	Logo	应用领域
美信 - MAXIM		光电二极管转换器电阻器
页数	文件大小	规格书
14页	262K
描述
Digital Potentiometer, 4 Func, 50000ohm, 2-wire Serial Control Interface, 64 Positions, CMOS, PDSO20, 0.300 INCH, SOIC-20

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DS1844S-050+ 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	SOIC
包装说明：	SOP, SOP20,.4	针数：	20
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	8.48
其他特性：	REST 3 RESISTOR ARRAY VALUES ARE 50000 OHMS EACH WITH 64 TAP POSITION	标称带宽：	0.2 kHz
控制接口：	2-WIRE SERIAL	转换器类型：	DIGITAL POTENTIOMETER
JESD-30 代码：	R-PDSO-G20	JESD-609代码：	e3
长度：	12.8 mm	湿度敏感等级：	1
功能数量：	4	位置数：	64
端子数量：	20	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP20,.4
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260	电源：	3/5 V
认证状态：	Not Qualified	电阻定律：	LINEAR
最大电阻容差：	20%	最大电阻器端电压：	3.5 V
最小电阻器端电压：	-0.5 V	座面最大高度：	2.65 mm
子类别：	Digital Potentiometers	标称供电电压：	3 V
表面贴装：	YES	技术：	CMOS
标称温度系数：	750 ppm/ °C	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	30	标称总电阻：	50000 Ω
宽度：	7.5 mm	Base Number Matches：	1

DS1844S-050+ 数据手册

DS1844

SLAVE ADDRESS

A command/control byte is the 1^stbyte received following the START condition from the master device.

The command/control byte consists of a 4-bit control code. For the DS1844, this is set as 0101 binary for

read/write operations. The next 3 bits of the command/ control byte are the device select bits or slave

address (A2, A1, A0). They are used by the master device to select which of eight devices is to be

accessed. When reading or writing the DS1844, the device-select bits must match the device-select pins

(A2, A1, A0). The last bit of the command/control byte (R/W) defines the operation to be performed.

When set to a 1 a read operation is selected, and when set to a 0 a write operation is selected. Figure 5

shows the command/control byte structure for the DS1844.

Following the START condition, the DS1844 monitors the SDA bus checking the device type identifier

being transmitted. Upon receiving the 0101 control code, the appropriate device address bits, and the

read/write bit, the slave device outputs an acknowledge signal on the SDA line.

COMMAND AND PROTOCOL

The command and protocol structure of the DS1844 allows the user to read or write the potentiometer(s).

Additionally, the 2-wire command/protocol structure of the DS1844 will support eight different devices

and a maximum of 32 channels that can be uniquely controlled. The command structures for the device

are presented in Figures 6 and 7. Potentiometer data values and control and command values are always

transmitted most significant bit (MSB) first. During communications, the receiving unit always generates

the acknowledgement.

Reading the DS1844

As shown in Figure 6, the DS1844 provides one read command operation. This operation allows the user

to read all potentiometers. Specifically, the R/W bit of the command/control byte is set equal to a 1 for a

read operation. Communication to read the DS1844 begins with a START condition which is issued by

the master device. The command/control byte from the master device will follow the START condition.

Once the command/control byte has been received by the DS1844, the part will respond with an

ACKNOWLEDGE. The read/write bit of the command/control byte, as stated, should be set equal to 1

for reading the DS1844.

When the master has received the ACKNOWLEDGE from the DS1844, the master can then begin to

receive potentiometer wiper data. The value of the potentiometer-0 wiper position will be the first

returned from the DS1844, followed by potentiometer-1 and so forth. Once the 8 bits of the

potentiometer-0 wiper position have been transmitted, the master will need to issue an

ACKNOWLEDGE, unless it is the only byte to be read, in which case the master issues a NOT

ACKNOWLEDGE. If desired the master may stop the communication transfer at this point by issuing the

STOP condition. However, if the value of the remaining potentiometers is needed, transfer can continue

by clocking the 8 bits of the potentiometer-1 value, followed by an ACKNOWLEDGE, and so forth.

Final communication transfer is terminated by issuing the STOP command. Again, the flow of the read

operation is presented in Figure 6.

Writing the DS1844

A data flow diagram for writing the DS1844 is shown in Figure 7. The DS1844 has one write command

that is used to change the position(s) of the wiper. The 2-wire serial interface write structure is similar to

that of the 5-wire serial write. However, there are differences.

All the write operations begin with a START condition. Following the START condition, the master

device will issue the command/control byte. The read/write bit of the command/control byte will be set to

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与DS1844S-050+相关器件

型号	品牌	描述	获取价格	数据表
DS1844S-050+T&R	MAXIM	Digital Potentiometer, 4 Func, 50000ohm, 2-wire Serial Control Interface, 64 Positions, CM	获取价格
DS1844SN-010	MAXIM	Digital Potentiometer, 4 Func, 10000ohm, 2-wire Serial Control Interface, 64 Positions, PD	获取价格
DS1844SN-100	MAXIM	Digital Potentiometer, 4 Func, 100000ohm, 2-wire Serial Control Interface, 64 Positions, P	获取价格
DS1845	DALLAS	Dual NV Potentiometer and Memory	获取价格
DS1845B-010	DALLAS	Dual NV Potentiometer and Memory	获取价格
DS1845B-010+	MAXIM	Digital Potentiometer, 2 Func, 10000ohm, 2-wire Serial Control Interface, 256 Positions, P	获取价格

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