oC, Charge Pump OFF 0.1 1 10" />
參數資料
型號: DS2890P-000
廠商: Maxim Integrated Products
文件頁數: 2/27頁
文件大?。?/td> 0K
描述: IC POT DIGITAL 1-WIRE 100K 6TSOC
標準包裝: 120
接片: 256
電阻(歐姆): 100k
電路數: 1
溫度系數: 標準值 800 ppm/°C
存儲器類型: 易失
接口: 1 線 串行
電源電壓: 2.8 V ~ 6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 6-LSOJ
供應商設備封裝: 6-TSOC
包裝: 管件
DS2890
10 of 27
FIGURE 11. Typical Wiper Resistance vs Wiper Voltage at 25
oC,
Charge Pump OFF
0.1
1
10
100
02
4
6
8
10
Voltage Across Wiper (Volts)
W
iper
Resistance
(Kohms)
V
PU=2.8V
V
PU=5V
V
PU=6V
64-BIT LASTERED ROM
Each DS2890 contains a unique and unalterable lasered ROM registration number that is 64 bits long; the
format of this value is shown in Figure 12. The first 8 bits are a 1-Wire family code; the family code for
the DS2890 and future 1-Wire Potentiometers is 2Ch. The next 48 bits are a unique serial number that is
administered by Dallas Semiconductor. The last 8 bits are a CRC of the first 56 bits. The 1-Wire CRC is
generated using a polynomial generator consisting of a shift register and XOR gates as shown in Figure
13. Operationally, the CRC generator works as follows: The shift register bits are first initialized to zero.
Then starting with the least significant bit, the 8-bit family code is shifted in. After the 8th bit of the
family code has been entered, the 48-bit serial number is shifted in. After shifting in the 48th bit of the
serial number the shift register contains the CRC value. Shifting in the 8 bits of CRC should return the
shift register to an all zeros value. The 64-bit ROM and the 1-Wire Function Controller portions of the
DS2890 allow the device to operate as a 1-Wire device and follow the protocol detailed in the section
“TRANSACTION SEQUENCE”.
FIGURE 12. 64-BIT LASERED ROM
MSB
LSB
8-Bit CRC Code
48-Bit Serial Number
8-Bit Family Code (2Ch)
MSB
LSB
MSB
LSB
MSB
LSB
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