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参数资料
| 型号： | DS1669S-50+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/11页 |
| 文件大小： | 0K |
| 描述： | IC RHEOSTAT DALLASTAT 50K 8-SOIC |
| 标准包装： | 2,000 |
| 系列： | Dallastat™ |
| 接片： | 64 |
| 电阻（欧姆）： | 50k |
| 电路数： | 1 |
| 温度系数： | 标准值 750 ppm/°C |
| 存储器类型： | 非易失 |
| 接口： | 上/下 |
| 电源电压： | ±4.5 V ~ 8 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.209"，5.30mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
DS1669
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the digital source input, D, the up contact input, UC, and the down contact input, DC. Other pins include
the positive, +V, and negative, -V, supply inputs. The DS1669 is specified to operate from -40°C to
+85°C.
OPERATION
The DS1669 can be configured to operate from a single contact closure, dual contact closure, or a digital
source input. Figures 1 and 2 illustrate both contact closure configurations. Contact closure is defined as a
transition from a high level to a low level on the up contact (UC) or down contact (DC) inputs. All three
control inputs are active when in a low state and are inactive when in a high state.
The DS1669 interprets input pulse widths as the means of controlling wiper movement. A single pulse
input on the UC, DC, or D input terminals will cause the wiper position to move 1/64th of the total
resistance. A transition from a high to low on these inputs is considered the beginning of pulse activity or
contact closure. A single pulse must be greater than 1 ms but lasting no longer than 1 second. Pulse
timings are shown in Figure 5.
Repetitive pulsed inputs can be used to step through each resistive position of the device in a relatively
fast manner (see Figure 5b). The requirement for repetitive pulsed inputs is that pulses must be separated
by a minimum time of 1 ms. If the input is not allowed to be inactive (high) for at least 1 ms, the DS1669
will interpret repetitive pulses as a single pulse.
Pulse inputs lasting longer than 1 second will cause the wiper to move one position every 100 ms
following the initial 1-second hold time. The total time to transcend the entire potentiometer using a
continuous input pulse is given by the formula below:
1 second + 63 X 100 ms = 7.3 (seconds)
Single contact closure operation allows the user to control wiper movement in either direction from a
single pushbutton input. Figure 1 presents a typical single pushbutton configuration. The UC input is used
to increment and decrement wiper position for single pushbutton mode of operation. The DC input
provides no functionality in this mode but must be connected to the positive supply voltage (VCC). The
digital source input (D) can be allowed to float.
On device power-up, the configuration shown in Figure 1 must exist in order to enter the single contact
closure mode of operation
especially and specifically, the (DC) input’s direct connection to the positive
supply voltage (VCC).
The initial direction of wiper movement in single pushbutton operation is determined by prior activity.
The initial direction of wiper movement will be opposite to that of the previous activity. Changing the
direction of wiper movement in single pushbutton mode is accomplished by allowing a period of
inactivity on the UC input of (greater than) 1 second, or by moving the wiper to the end of the
potentiometer range. This will occur regardless of whether the input is a continuous pulse, a sequence of
repetitive pulses or a single pulse.
The digital source input, D, was designed for microprocessor or controlled applications. This control
input manipulates the device in the same manner as the single pushbutton configuration, controlling
movement of the wiper position in both upward and downward directions. One added feature over the
single pushbutton configuration is the ability to increment or decrement wiper position at a faster rate.
Digital source input control is available regardless of the type of pushbutton configuration.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1669SC04 | 制造商:DALLAS 功能描述:* |
| DS1669SN-10 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Digital Potentiometer |
| DS1669SN-100 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Digital Potentiometer |
| DS1669SN-50 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Digital Potentiometer |
| DS1670 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Portable System Controller |
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