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參數(shù)資料
| 型號(hào)： | DS87C550 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | EPROM High-Speed Micro with A/D and PWM(帶 A/D 和 PWM的EPROM/ROM高速微控制器) |
| 中文描述： | 存儲(chǔ)器高速微與A / D及PWM（帶A / D轉(zhuǎn)換和脈寬調(diào)制的存儲(chǔ)器/ ROM的高速微控制器） |
| 文件頁數(shù)： | 24/27頁 |
| 文件大?。?/td> | 119K |
| 代理商： | DS87C550 |
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DIVIDE BY 4 MODE
CLOCK OSCILLATOR
CLOCKPMM1
CLOCKPMM2
RINGDIVIDE BY 4 MODE
RING OSCIPMM1
PMM2
RING OSCILLATOR/XTAL OFF
DIVIDE BY 4 MODE
CLOCK OSCILLATOR
RINDIVIDE BY 4 MODE
RING OSCIPMM1
RING OSCIPMM2
DIVIDE BY 4 MODE
CLOCK OSCILLATOR
RINGDIVIDE BY 4 MODE
RING OSCIPMM1
RING OSCIPMM2
a. Maximum Functionality
Progression
b. Low Power/Quick
Serial Response
c. Minimum Power
Progression
APPLICATION NOTE 78
030998 24/27
GRADUAL POWER DOWN
Often, a device will need to be operating constantly dur-
ing periods of little activity. This may be to monitor sys-
tem status, or to time critical events. While such a sys-
tem can tolerate some performance degradation for the
sake of power savings, it cannot halt operation by using
the Stop mode. The Power Management modes used in
the DS87C5x0 allow software to gradually reduce sys-
tem performance based on the amount and type of
tasks. This approach is similar to that used by personal
computers, where inactivity for a specified period of time
will cause the system to reduce its speed to the next
lower level of performance.
The decision of when to switch modes, and which
modes to switch between is dependent on the user’s
application. Constructing a “power path” is the simplest
way to determine what speeds and clock source are
appropriate. For a relatively simple system, only a few
states are needed. The power management modes
PMM1 and PMM2 were specifically designed to be part
of such a gradual power reduction.
Figure 8 demonstrates a number of power paths pos-
sible with the DS87C5x0 power management capabili-
ties. Figure 8a shows a relatively complicated scheme
which performs a gradual reduction in operating speed,
while keeping the clock oscillator operating as long as
possible to perform timing–dependent functions. Figure
8b switches to the ring oscillator and gradually reduces
the speed of the device, but keeps the crystal amplifier
enabled in case the device needs to quickly respond to
serial port activity. Figure 8c provides the lowest power
consumption by switching to the ring oscillator and dis-
abling the crystal amplifier.
SAMPLE POWER PATHS
Figure 8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS87C550-FCL | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM |
| DS87C550-FNL | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM |
| DS87C550-KCL | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM |
| DS87C550-QCL | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM High-Speed Micro with A/D and PWM |
| DS87C550-QCL+ | 功能描述:IC MCU EPROM ADC/PWM HS 68-PLCC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:87C 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:260 系列:73S12xx 核心處理器:80515 芯體尺寸:8-位 速度:24MHz 連通性:I²C，智能卡，UART/USART，USB 外圍設(shè)備:LED，POR，WDT 輸入/輸出數(shù):9 程序存儲(chǔ)器容量:64KB（64K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-VFQFN 裸露焊盤 包裝:管件 |
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