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参数资料
| 型号： | DS1986-F3 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Programmable ROM |
| 英文描述： | 64K X 1 OTPROM, MEDB2 |
| 封装： | MICROCAN-2 |
| 文件页数： | 6/28页 |
| 文件大小： | 680K |
| 代理商： | DS1986-F3 |
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DS1986
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the bus master agrees with the 16-bit CRC calculated by the DS1986. If an incorrect CRC is ignored and
a program pulse is applied by the bus master, incorrect programming could occur within the DS1986.
Also note that the DS1986 will always increment its internal address counter after the receipt of the eight
read time slots used to confirm the programming of the selected EPROM byte. The decision to continue is
again made entirely by the bus master. Therefore if the EPROM data byte does not match the supplied
data byte but the master continues with the write command, incorrect programming could occur within
the DS1986. The write command sequence can be ended at any point by issuing a Reset Pulse.
WRITE MEMORY [0FH]/SPEED WRITE MEMORY [F3H]
The Write Memory command is used to program the 65536-bit EPROM data field. The details of the
functional flow chart are described in the section “WRITING EPROM MEMORY”.
The data memory address range is 0000H to 1FFFH. If the bus master sends a starting address higher than
this, the three most significant address bits are set to zeros by the internal circuitry of the chip. This will
result in a mismatch between the CRC calculated by the DS1986 and the CRC calculated by the bus
master, indicating an error condition.
To save time when writing more than one consecutive byte of the DS1986’s data memory it is possible to
omit reading the 16-bit CRC which allows verification of data and address before the data is copied to the
EPROM memory. At regular speed this saves 16 time slots or 976
μs for every byte to be programmed.
This speed programming mode is accessed with the command code F3H instead of 0FH. It follows
basically the same flow chart as the Write Memory command, but skips sending the CRC immediately
preceding the program pulse. This command should only be used if the electrical contact between bus
master and the DS1986 is firm since a poor contact may result in corrupted data inside the EPROM
memory.
WRITE STATUS [55H]/ SPEED WRITE STATUS [F5H]
The Write Status command is used to program the 2816-bit EPROM Status Memory field. The details of
the functional flow chart are described in the section “WRITING EPROM MEMORY”.
The Status Memory address range is 0000H to 01FFH. Attempts to write to the not implemented status
memory locations will be ignored. If the bus master sends a starting address higher than 1FFFH, the three
most significant address bits are set to zeros by the internal circuitry of the chip. This will result in a
mismatch between the CRC calculated by the DS1986 and the CRC calculated by the bus master,
indicating an error condition.
To save time when writing more than one consecutive byte of the DS1986’s status memory it is possible
to omit reading the 16-bit CRC which allows verification of data and address before the data is copied to
the EPROM memory. At regular speed this saves 16 time slots or 976
μs for every byte to be
programmed. This speed-programming mode is accessed with the command code F5H instead of 55H. It
follows basically the same flow chart as the Write Status command, but skips sending the CRC
immediately preceding the program pulse. This command should only be used if the electrical contact
between bus master and the DS1986 is firm since a poor contact may result in corrupted data inside the
EPROM status memory.
相关PDF资料 |
PDF描述 |
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| DS1986-F5 | 64K X 1 OTPROM, MADB2 |
| DS1991L-F5 | SPECIALTY MEMORY CIRCUIT, MEDB2 |
| DS1994L-F5 | SPECIALTY MEMORY CIRCUIT, MRDB2 |
| DS1993L-F5 | SPECIALTY MEMORY CIRCUIT, MRDB2 |
| DS1992L-F5 | SPECIALTY MEMORY CIRCUIT, MRDB2 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1986-F3# | 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
| DS1986-F3+ | 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
| DS1986F5 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:EPROM|256X32X8|BUTTON|METAL |
| DS1986-F5 | 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
| DS1986-F5# | 功能描述:iButton RoHS:否 存储类型:SRAM 存储容量:512 B 组织: 工作电源电压:3 V to 5.25 V 接口类型:1-Wire 最大工作温度:+ 85 C 尺寸:17.35 mm x 5.89 mm 封装 / 箱体:F5 MicroCan 制造商:Maxim Integrated |
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