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參數(shù)資料
| 型號： | DS2406X |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Programmable ROM |
| 英文描述： | 1K X 1 OTPROM |
| 封裝： | CSP-6 |
| 文件頁數(shù)： | 25/30頁 |
| 文件大小： | 156K |
| 代理商： | DS2406X |
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DS2406
4 of 30
PARASITE POWER
The DS2406 can derive its power entirely from the 1-Wire bus by storing energy on an internal capacitor
during periods of time when the signal line is high. During low times the device continues to operate off
of this “parasite” power source until the 1-Wire bus returns high to replenish the parasite (capacitor)
supply. In applications where the device may be temporarily disconnected from the 1-Wire bus or where
the low-times of the 1-Wire bus may be very long the VCC pin may be connected to an external voltage
supply to maintain the device status.
When writing to the EPROM memory, the 1-Wire communication occurs at normal voltage levels and
then is pulsed momentarily to the programming voltage to cause the selected EPROM bits to be
programmed. The bus master must be able to provide 12V and 10 mA to adequately program the EPROM
portions of the device. During programming, only EPROM-based devices are allowed to be present on
the 1-Wire bus.
64-BIT LASERED ROM
Each DS2406 contains a unique ROM code that is 64 bits long. The first eight bits are a 1-Wire family
code. The next 48 bits are a unique serial number. The last eight bits are a CRC of the first 56 bits. (See
Figure 3). The 1-Wire CRC is generated using a polynomial generator consisting of a shift register and
XOR gates as shown in Figure 4. The polynomial is X
8
+ X
5
+ X
4
+ 1. Additional information about the
Dallas 1-Wire Cyclic Redundancy Check is available in Application Note 27 or the Book of DS19xx
iButton Standards. The shift register bits are initialized to zero. Then starting with the least significant bit
of the family code, one bit at a time is shifted in. After the 8th bit of the family code has been entered,
then the serial number is entered. After the 48th bit of the serial number has been entered, the shift
register contains the CRC value. Shifting in the eight bits of CRC should return the shift register to all
zeros. The 64-bit ROM and the 1-Wire Function Control section allow the DS2406 to operate as a 1-Wire
device and follow the protocol detailed in the section “1-Wire Bus System”.
64-BIT LASERED ROM Figure 3
MSB
LSB
8-Bit CRC Code
48-Bit Serial Number
8-Bit Family Code (12h)
MSB
LSB
MSB
LSB
MSB
LSB
1-WIRE CRC GENERATOR Figure 4
R
X2
X1
X0
X8
X7
X6
X5
X4
X3
8TH
STAGE
7TH
STAGE
6TH
STAGE
5TH
STAGE
4TH
STAGE
3RD
STAGE
2ND
STAGE
1ST
STAGE
S
INPUT DATA
Polynomial = X8 + X5 + X4 + 1
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