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參數(shù)資料
| 型號(hào)： | DS1985-F5 |
| 英文描述： | 16-kbit Add-Only iButton |
| 中文描述： | 16千比特只添加iButton的 |
| 文件頁(yè)數(shù)： | 8/25頁(yè) |
| 文件大小： | 440K |
| 代理商： | DS1985-F5 |
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DS1985
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READ STATUS [AAH]
The Read Status command is used to read data from the EPROM Status data field. The bus master
follows the command byte with a 2-byte address (TA1=(T7:T0), TA2=(T15:T8)) that indicates a starting
byte location within the data field. With every subsequent read data time slot the bus master receives data
from the DS1985 starting at the supplied address and continuing until the end of an 8-byte page of the
EPROM Status data field is reached. At that point the bus master will receive a 16-bit CRC of the
command byte, address bytes and status data bytes. This CRC is computed by the DS1985 and read back
by the bus master to check if the command word, starting address and data were received correctly. If the
CRC read by the bus master is incorrect, a Reset Pulse must be issued and the entire sequence must be
repeated.
Note that the initial pass through the Read Status flow chart will generate a 16-bit CRC value that is the
result of clearing the CRC generator and then shifting in the command byte followed by the two address
bytes, and finally the data bytes beginning at the first addressed memory location and continuing through
to the last byte of the addressed EPROM Status data page. The last byte of a Status data page always has
an ending address of xx7 or xxFH. Subsequent passes through the Read Status flow chart will generate a
16-bit CRC that is the result of clearing the CRC generator and then shifting in the new data bytes starting
at the first byte of the next page of the EPROM Status data field.
This feature is provided since the EPROM Status information may change over time making it impossible
to program the data once and include an accompanying CRC that will always be valid. Therefore, the
Read Status command supplies a 16-bit CRC that is based on and always is consistent with the current
data stored in the EPROM Status data field.
After the 16-bit CRC of the last EPROM Status data page is read, the bus master will receive logical 1s
from the DS1985 until a Reset Pulse is issued. The Read Status command sequence can be ended at any
point by issuing a Reset Pulse.
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PDF描述 |
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| DS1985-F3 | 16-kbit Add-Only iButton |
| DS1990P | Analog IC |
| DS1990R | Analog IC |
| DS1991L | Analog IC |
| DS1991LP | Analog IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1985-F5# | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1985-F5+ | 功能描述:iButton 16Kb Add-Only iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1985U | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:UniqueWare iButton |
| DS1985U-F5-117D+ | 功能描述:iButton RoHS:否 存儲(chǔ)類型:SRAM 存儲(chǔ)容量:512 B 組織: 工作電源電壓:3 V to 5.25 V 接口類型:1-Wire 最大工作溫度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封裝 / 箱體:F5 MicroCan 制造商:Maxim Integrated |
| DS1986 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:64-kbits Add-Only iButton⑩ |
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