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参数资料
| 型号： | DS1845X-100 |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | 数字电位计 |
| 英文描述： | 100K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, UUC14 |
| 封装： | FCP-14 |
| 文件页数： | 7/13页 |
| 文件大小： | 98K |
| 代理商： | DS1845X-100 |
DS1845
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H0, H1 – These are the high-end terminals of the potentiometers. For both potentiometers, it is not
required that these terminals be connected to a potential greater than the low-end terminal of the
potentiometer. Voltage applied to the high end of the potentiometers cannot exceed the power supply
voltage, VCC, or go below ground.
L0, L1 – These are the low-end terminals of the potentiometers. It is not required that these terminals be
connected to a potential less than the high-end terminals of the pot. Voltage applied to the low end of the
potentiometers cannot exceed the power-supply voltage, VCC, or go below ground.
W0, W1 - Wiper of the Potentiometer. This pin is the wiper terminal of the potentiometer. The bytes in
EEPROM memory locations F8h and F9h determine each wiper’s setting. Voltage applied to either
wiper terminal cannot exceed the power-supply voltage, VCC, or go below ground.
MEMORY ORGANIZATION
The DS1845’s serial EEPROM is internally organized with 256 words of 1 byte each. Each word requires
an 8-bit address for random word addressing. The byte at address F9h determines the wiper setting for
potentiometer 0, which contains 100 positions. Writing values above 63h to this address sets the wiper to
its uppermost position. The byte at address F8h determines the wiper setting for potentiometer 1, which
contains 256 positions (00h to FFh). Address locations FAh though FFh are reserved and should not be
written.
DEVICE OPERATION
Clock and Data Transitions: The SDA pin is normally pulled high with an external resistor or device.
Data on the SDA pin may only change during SCL low time periods. Data changes during SCL high
periods will indicate a start or stop conditions depending on the conditions discussed below. Refer to the
timing diagram Fig 2 for further details.
Start Condition: A high-to-low transition of SDA with SCL high is a start condition which must
precede any other command. Refer to the timing diagram Fig 2 for further details.
Stop Condition: A low-to-high transition of SDA with SCL high is a stop condition. After a read
sequence, the stop command places the DS1845 into a low-power mode. Refer to the timing diagram Fig
2 for further details.
Acknowledge: All address and data byte are transmitted via a serial protocol. The DS1845 pulls the
SDA line low during the ninth clock pulse to acknowledge that it has received each word.
Standby Mode: The DS1845 features a low-power mode that is automatically enabled after power-on,
after a stop command, and after the completion of all internal operations.
2-Wire Interface Reset: After any interruption in protocol, power loss, or system reset, the following
steps reset the DS1845.
1. Clock up to nine cycles.
2. Look for SDA high in each cycle while SCL is high.
3.
Create a start condition while SDA is high.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1845X-100/T&R | 制造商:Maxim Integrated Products 功能描述:DUAL NV POT & MEM BUMP 10K/100K TR - Tape and Reel 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:IC POT/MEM DUAL NV 100K 14-FCP |
| DS1845X-100/T&R | 功能描述:数字电位计 IC RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| DS1846 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:NV Tri-Potentiometer, Memory, and MicroMonitor |
| DS1846E-010 | 功能描述:数字电位计 IC RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| DS1846E-010/R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:NV Tri-Potentiometer, Memory, and MicroMonitor |
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