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参数资料
| 型号： | DS1856E-M50+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/31页 |
| 文件大小： | 0K |
| 描述： | IC DGTL POT 50K 256TAPS 16TSSOP |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 96 |
| 接片： | 256 |
| 电阻（欧姆）： | 50k |
| 电路数： | 2 |
| 温度系数： | 标准值 50 ppm/°C |
| 存储器类型： | 非易失 |
| 接口： | 2 线串口 |
| 电源电压： | 2.85 V ~ 5.5 V |
| 工作温度： | -40°C ~ 95°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 管件 |
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Dual, Temperature-Controlled Resistors with Inter-
nally Calibrated Monitors and Password Protection
Maxim Integrated
27
DS1856
Power-Up and Low-Voltage Operation
During power-up, the device is inactive until VCC
exceeds the digital power-on-reset voltage (POD). At this
voltage, the digital circuitry, which includes the 2-wire
interface, becomes functional. However, EEPROM-
backed registers/settings cannot be internally read
(recalled into shadow SRAM) until VCC exceeds the ana-
log power-on-reset voltage (POA), at which time the
remainder of the device becomes fully functional. Once
VCC exceeds POA, the RDYB bit in byte 6Eh of the Main
Device memory is timed to go from a 1 to a 0 and indi-
cates when analog-to-digital conversions begin. If VCC
ever dips below POA, the RDYB bit reads as a 1 again.
Once a device exceeds POA and the EEPROM is
recalled, the values remain active (recalled) until VCC falls
below POD.
For 2-wire device addresses sourced from EEPROM
(ADFIX = 1), the device address defaults to A2h until VCC
exceeds POA and the EEPROM values are recalled. The
Auxiliary Device (A0h) is always available within this volt-
age window (between POD and the EEPROM recall)
regardless of the programmed state of ADEN.
Furthermore, as the device powers up, the VCClo alarm
flag (bit 4 of 70h in Main Device) defaults to a 1 until the
first VCC analog-to-digital conversion occurs and sets or
clears the flag accordingly.
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 condition depending on the
conditions discussed below. See the timing diagrams
in Figures 5 and 6 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. See the timing diagrams in Figures 5
and 6 for further details.
STOP Condition: A low-to-high transition of SDA with
SCL high is a STOP condition. After a read or write
sequence, the stop command places the DS1856 into a
low-power mode. See the timing diagrams in Figures 5
and 6 for further details.
Acknowledge: All address and data bytes are trans-
mitted through a serial protocol. The DS1856 pulls the
SDA line low during the ninth clock pulse to acknowl-
edge that it has received each word.
Standby Mode: The DS1856 features a low-power
mode that is automatically enabled after power-on,
after a STOP command, and after the completion of all
internal operations.
Device Addressing: The DS1856 must receive an 8-bit
device address, the slave address byte, following a
START condition to enable a specific device for a read
or write operation. The address is clocked into this part
MSB to LSB. The address byte consists of either A2h or
the value in Table 03, 8Ch for the Main Device or A0h
for the Auxiliary Device, then the R/W bit. This byte
must match the address programmed into Table 03,
8Ch or A0h (for the Auxiliary Device). If a device
address match occurs, this part will output a zero for
one clock cycle as an acknowledge and the corre-
sponding block of memory is enabled (see the
Memory
Organization section). If the R/W bit is high, a read
operation is initiated. If the R/W is low, a write operation
is initiated (see the
Memory Organization section). If the
address does not match, this part returns to a low-
power mode.
Write Operations
After receiving a matching address byte with the R/W
bit set low, if there is no write protect, the device goes
into the write mode of operation (see the
Memory
Organization section). 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
byte has been received, the DS1856 transmits a zero
for one clock cycle to acknowledge the address has
been received. The master must then transmit an 8-bit
data word to be written into this address. The DS1856
again transmits a zero for one clock cycle to acknowl-
edge the receipt of the data. At this point, the master
must terminate the write operation with a STOP condi-
tion. The DS1856 then enters an internally timed write
process tw to the EEPROM memory. All inputs are dis-
abled during this byte write cycle.
Page Write
The DS1856 is capable of an 8-byte page write. A page
is any 8-byte block of memory starting with an address
evenly divisible by eight and ending with the starting
address plus seven. For example, addresses 00h
through 07h constitute one page. Other pages would
be addresses 08h through 0Fh, 10h through 17h, 18h
through 1Fh, etc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1856E-M50+ | 功能描述:数字电位计 IC DUALTEMP 50K3MON W/FULL AO/A2 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 |
| DS1856E-M50+R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual, Temperature-Controlled Resistors with Calibrated Monitors and Password Protection |
| DS1856E-M50+T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual, Temperature-Controlled Resistors with Calibrated Monitors and Password Protection |
| DS1856E-M50+T&R | 制造商:Maxim Integrated Products 功能描述:DUALTEMP 50K,3MON TSSOP W/AO/A2 MEMORY - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC DGTL POT 50K 2CH 16TSSOP 制造商:Maxim Integrated Products 功能描述:Digital Potentiometer ICs DUALTEMP 50K3MON W/FULL AO/A2 MEMORY |
| DS1856E-M50+T&R | 功能描述:数字电位计 IC DUALTEMP 50K3MON W/FULL AO/A2 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 |
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