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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： | 12/28页 |
| 文件大小： | 680K |
| 代理商： | DS1986-F3 |
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DS1986
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iButton DESCRIPTION
The DS1986 64Kb Add-Only iButton is a rugged read/write data carrier that identifies and stores relevant
information about the product or person to which it is attached. This information can be accessed with
minimal hardware, for example a single port pin of a microcontroller. The DS1986 consists of a factory-
lasered registration number that includes a unique 48-bit serial number, an 8-bit CRC, and an 8-bit Family
Code (0Fh) plus 64Kb of EPROM that is user-programmable. The power to program and read the
DS1986 is derived entirely from the 1-Wire communication line. Data is transferred serially via the
1-Wire protocol that requires only a single data lead and a ground return. The entire device can be
programmed and then write-protected if desired. Alternatively, the part may be programmed multiple
times with new data being appended to, but not overwriting, existing data with each subsequent
programming of the device. Note: Individual bits can be changed only from a logical 1 to a logical 0,
never from a logical 0 to a logical 1. A provision is also included for indicating that a certain page or
pages of data are no longer valid and have been replaced with new or updated data that is now residing at
an alternate page address. This page address redirection allows software to patch data and enhance the
flexibility of the device as a standalone database. The 48-bit serial number that is factory-lasered into
each DS1986 provides a guaranteed unique identity that allows for absolute traceability. The durable
MicroCan package is highly resistant to harsh environments such as dirt, moisture, and shock. Its compact
button-shaped profile is self-aligning with cup-shaped receptacles, allowing the DS1986 to be used easily
by human operators or automatic equipment. Accessories permit the DS1986 to be mounted on printed
circuit boards, plastic key fobs, photo-ID badges, ID bracelets, and many other objects. Applications
include work-in-progress tracking, electronic travelers, access control, storage of calibration constants,
and debit tokens.
OVERVIEW
The block diagram in Figure 1 shows the relationships between the major control and memory sections of
the DS1986. The DS1986 has three main data components: 1) 64-bit lasered ROM, 2) 65536 bits
EPROM Data Memory, and 3) 2816 bits EPROM Status Memory. The device derives its power for read
operations entirely from the 1-Wire communication line by storing energy on an internal capacitor during
periods of time when the signal line is high and continues to operate off of this “parasite” power source
during the low times of the 1-Wire line until it returns high to replenish the parasite (capacitor) supply.
During programming, 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 1-
Wire line must be able to provide 12 volts and 10 milliamperes to adequately program the EPROM
portions of the part. Whenever programming voltages are present on the 1-Wire line a special high
voltage detect circuit within the DS1986 generates an internal logic signal to indicate this condition. The
hierarchical structure of the 1-Wire protocol is shown in Figure 2. The bus master must first provide one
of the six ROM Function Commands, 1) Read ROM, 2) Match ROM, 3) Search ROM, 4) Skip ROM, 5)
Overdrive-Skip ROM, or 6) Overdrive-Match ROM. Upon completion of an Overdrive ROM command
byte executed at regular speed, the device will enter the Overdrive mode where all subsequent
communication occurs at a higher speed. These commands operate on the 64-bit lasered ROM portion of
each device and can singulate a specific device if many are present on the 1-Wire line as well as indicate
to the bus master how many and what types of devices are present. The protocol required for these ROM
Function Commands is described in Figure 8. After a ROM Function Command is successfully executed,
the memory functions that operate on the EPROM portions of the DS1986 become accessible and the bus
master may issue any one of the five Memory Function Commands specific to the DS1986 to read or
program the various data fields. The protocol for these Memory Function Commands is described in
Figure 5. All data is read and written least significant bit first.
1-Wire and iButton are registered trademarks of Dallas Semiconductor.
相关PDF资料 |
PDF描述 |
|---|---|
| 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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