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参数资料
| 型号： | DS2252T-64-16 |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Microcontroller |
| 英文描述： | 8-BIT, MICROCONTROLLER, SMA40 |
| 封装： | SIMM-40 |
| 文件页数： | 8/15页 |
| 文件大小： | 125K |
| 代理商： | DS2252T-64-16 |
DS2252T
021998 2/15
Using a security system based on the DS5002FP, the
DS2252T protects the memory contents from disclo-
sure. It loads program memory via its serial port and
encrypts it in real–time prior to storing it in SRAM. Once
encrypted, the RAM contents and the program flow are
unintelligible. The real data exists only inside the pro-
cessor chip after being decrypted. Any attempt to dis-
cover the on–chip data, encryption keys, etc., results in
its destruction. Extensive use of nonvolatile lithium
backed technology create a microcontroller that retains
data for over 10 years at room temperature, but which
can be erased instantly if tampered with. The DS2252T
even interfaces directly to external tamper protection
hardware.
The DS2252T provides a permanently powered real
time lock with interrupts for time stamp and date. It
keeps time to one hundredth of a second using its on–
board 32 KHz crystal.
Like other Secure Microcontrollers in the family, the
DS2252T provides crashproof operation in portable
systems or systems with unreliable power. These fea-
tures include the ability to save the operating state,
Power–fail Reset, Power–fail Interrupt, and Watchdog
Timer. All nonvolatile memory and resources are main-
tained for over 10 years at room temperature in the
absence of power.
A user loads programs into the DS2252T via its on–chip
Serial Bootstrap Loader. This function supervises the
loading of software into NV RAM, validates it, then
becomes transparent to the user. It also manages the
loading of new encryption keys automatically. Software
is stored in on–board CMOS SRAM. Using its internal
Partitioning, the DS2252T can divide a common RAM
into user selectable program and data segments. This
Partition can be selected at program loading time, but
can be modified anytime later. The microcontroller will
decode memory access to the SRAM, access memory
via its Byte–wide bus and write–protect the memory por-
tion designated as program (ROM).
A detailed summary of the security features is provided
in the User’s Guide section of the Secure Microcontrol-
ler data book. An overview is also available in the
DS5002FP data sheet.
ORDERING INFORMATION
PART NUMBER
RAM SIZE
MAX CRYSTAL SPEED
TIMEKEEPING?
DS2252T–32–16
32K bytes
16 MHz
Yes
DS2252T–64–16
64K bytes
16 MHz
Yes
DS2252T–128–16
128K bytes
16 MHz
Yes
Operating information is contained in the User’s Guide section of the Secure Microcontroller Data Book. This data
sheet provides ordering information, pinout, and electrical specifications.
相关PDF资料 |
PDF描述 |
|---|---|
| DS2252T-32-16 | 8-BIT, MICROCONTROLLER, SMA40 |
| DS2252T | 8-BIT, MICROCONTROLLER, SMA40 |
| DS1722S | DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT |
| DS229E | LINE TRANSCEIVER, PDSO20 |
| DS229N | LINE TRANSCEIVER, PDIP20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2252T-64-16# | 功能描述:模块化系统 - SOM 64K Soft MCU Module RoHS:否 制造商:Digi International 外观尺寸:ConnectCore 9P 处理器类型:ARM926EJ-S 频率:150 MHz 存储容量:8 MB, 16 MB 存储类型:NOR Flash, SDRAM 接口类型:I2C, SPI, UART 工作电源电压:3.3 V 最大工作温度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
| DS2252T8-12 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| DS2252T8-16 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Microcontroller |
| DS2253T-612 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| DS2255-10 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Converter IC |
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