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參數(shù)資料
| 型號： | DS2251T-128-16 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | Microcontroller |
| 英文描述： | 8-BIT, MICROCONTROLLER, SMA72 |
| 封裝： | SIMM-72 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大小： | 654K |
| 代理商： | DS2251T-128-16 |
DS2251T
8 of 20
DS2251T MEMORY MAP WITH (PES=1) Figure 4
POWER MANAGEMENT
The DS2251T monitors VCC to provide Power-fail Reset, early warning Power-fail Interrupt, and switch-
over to lithium backup. It uses an internal band-gap reference in determining the switch points. These are
called VPFW, VCCMIN, and VLI respectively. When VCC drops below VPFW, the DS2251T will perform an
interrupt vector to location 2Bh if the power-fail warning is enabled. Full processor operation continues
regardless. When power falls further to VCCMIN, the DS2251T invokes a reset state. No further code
execution will be performed unless power rises back above VCCMIN. All decoded chip enables and the
R/ W signal go to an inactive (logic 1) state. The VRST signal will be driven to a logic 0. VCC is still the
power source at this time. When VCC drops further to below VLI, internal circuitry will switch to the built-
in lithium cell for power. The majority of internal circuits will be disabled and the remaining nonvolatile
states will be retained. PF will be driven to a logic 0. The User’s Guide has more information on this
topic. The trip points VCCMIN and VPFW are listed in the electrical specifications.
相關(guān)PDF資料 |
PDF描述 |
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| DS2251T-64-16 | 8-BIT, 16 MHz, MICROCONTROLLER, SMA72 |
| DS2251T-32-16 | 8-BIT, 16 MHz, MICROCONTROLLER, SMA72 |
| DS2252T-128-16 | 8-BIT, 16 MHz, MICROCONTROLLER, SMA40 |
| DS2252T-64-16 | 8-BIT, MICROCONTROLLER, SMA40 |
| DS2252T-32-16 | 8-BIT, MICROCONTROLLER, SMA40 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2251T-128-16# | 功能描述:模塊化系統(tǒng) - SOM 128K Soft MCU Module RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲(chǔ)容量:8 MB, 16 MB 存儲(chǔ)類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
| DS2251T32-08 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| DS2251T-32-12 | 功能描述:模塊化系統(tǒng) - SOM RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲(chǔ)容量:8 MB, 16 MB 存儲(chǔ)類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
| DS2251T32-12 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| DS2251T-32-16 | 功能描述:模塊化系統(tǒng) - SOM 32K Soft MCU Module RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲(chǔ)容量:8 MB, 16 MB 存儲(chǔ)類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in |
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