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参数资料
| 型号： | DS1855B-050 |
| 元件分类： | 数字电位计 |
| 英文描述： | Dual Nonvolatile Digital Potentiometer and Secure Memory |
| 中文描述： | 双非易失数字电位器及安全存储器 |
| 文件页数： | 17/20页 |
| 文件大小： | 252K |
| 代理商： | DS1855B-050 |
DS1855
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2-WIRE 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 in Figure 2
for further details.
START Condition
A high-to-low transition of SDA with SCL high is a START condition that must precede any other
command. Refer to the timing diagram in Figure 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 DS1855 into a low-power mode. Refer to the timing diagram in Figure 2 for further
details.
Acknowledge
All address and data bytes are transmitted via a serial protocol. The DS1855 pulls the SDA line low
during the ninth clock pulse to acknowledge that it has received each word.
Standby Mode
The DS1855 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 DS1855:
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.
Device Addressing
The DS1855 must receive an 8-bit device address word following a START condition to enable a specific
device for a read or write operation. The address word is clocked into the DS1855 MSB to LSB. The
address word consists of Ah (1010) followed by A2, A1, and A0 then the read/write (R/W) bit. If the
R/W bit is high, a read operation is initiated. If the R/W is low, a write operation is initiated. For a device
to become active, the values of A2, A1, and A0 must be the same as the hard-wired address pins on the
DS1855. Upon a match of written and hard-wired addresses, the DS1855 will output a zero for one clock
cycle as an acknowledge. If the address does not match, the DS1855 returns to a low-power mode.
Write Operations
After receiving a matching address byte with the R/W bit set low, the device goes into the write mode of
operation. The master must transmit an 8-bit EEPROM memory address to the device to define the
address where the data is to be written. After the reception of this byte, the DS1855 will transmit a zero
for one clock cycle to acknowledge the receipt of the address. The master must then transmit an 8-bit data
word to be written into this address. The DS1855 will again transmit a zero for one clock cycle to
acknowledge the receipt of the data. At this point, the master must terminate the write operation with a
STOP condition. The DS1855 then enters an internally timed write process Tw to the EEPROM memory.
All inputs are disabled during this byte write cycle.
相关PDF资料 |
PDF描述 |
|---|---|
| DS1855B-100 | Dual Nonvolatile Digital Potentiometer and Secure Memory |
| DS1855E-010 | Dual Nonvolatile Digital Potentiometer and Secure Memory |
| DS1855E-020 | Dual Nonvolatile Digital Potentiometer and Secure Memory |
| DS1855E-050 | Dual Nonvolatile Digital Potentiometer and Secure Memory |
| DS1855E-100 | Dual Nonvolatile Digital Potentiometer and Secure Memory |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1855B-050+ | 功能描述:数字电位计 IC Dual NV w/Memory 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 |
| DS1855B-100 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Dual Nonvolatile Digital Potentiometer and Secure Memory |
| DS1855B-100+ | 功能描述:数字电位计 IC Dual NV w/Memory 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 |
| DS1855E-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 |
| DS1855E-010/R | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Dual Nonvolatile Digital Potentiometer and Secure Memory |
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