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(yè)數(shù)： 19/27頁(yè)
文件大?。?/td> 119K
代理商： DS87C550
APPLICATION NOTE 78
030998 19/27
BURST MODE OPERATION
A common mode of operation is to have the device oper-
ate in a low power state, perform a brief task, and then
place the device back into a low power state until
another event occurs. Actions such as a keypad press,
or card reader activity fall within this category. Such
peripherals typically generate an external interrupt
which executes a switchback or resume from Stop
mode.
The decision on what to designate as the standby state
depends on the type of activity that will initiate a return to
the active state. If serial port activity is expected, then
the standby state must be one that can receive serial
data, such as PMM2. A system which can tolerate
longer interrupt latencies can use Stop mode as the low
power state.
An examination of the power consumption in the various
modes shows that when using a burst–mode approach,
the most power savings can be gained by operating in
divide by 4 mode, rather than the PMMs. Divide by 4
mode gives 16 times the performance of PMM1, but
consumes only four times the current. The higher pow-
er/performance ratio of divide by 4 mode means that
less total energy will be consumed during the subrou-
tine. As a result, routines that wake from Stop mode to
perform short bursts of activity and then return to Stop
should do so in divide by 4 mode.
PROGRAM EXAMPLE: REMOTE DATA
LOGGER
The following program illustrates a generic scheme for
running a remote, battery–powered data–logging
device which requires only sporadic use. In this exam-
ple, a DS87C530 “hibernates” in Stop mode until a key-
pad is pressed and performs some operation. After the
operation is performed, the device will return to Stop
mode. This device runs off the ring oscillator during
most of its awake state, unless a serial transfer is
expected or in progress. Periodically a real–time clock
interrupt will cause the device to acquire data from an
external source, record it in the on–chip SRAM, and
return to Stop mode. Figure 7 shows the state diagram
for how the device works. Although this example uses
the internal real time clock of the DS87C530, it can be
easily modified to work with an internal timer in PMM2 or
external real time clock.
REMOTE DATA LOGGER EXAMPLE STATE DIAGRAM
Figure 7
TRESPOND
D
CLK: RING
XTAL: ON
STRANSMIT
CLXTAL: ON
LOG DATA
XTAL:OFF
STOP MODE
CXTAL:OFF
RTC INTERRUPT
TASK COMPLETE
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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(lèi)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(lèi)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(pán) 包裝:管件
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