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參數(shù)資料
| 型號： | DS87C530 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | EPROM/ROM Micro with Real Time Clock(帶實時時鐘的EPROM/ROM高速微控制器) |
| 中文描述： | EPROM微控制器，帶有實時時鐘 |
| 文件頁數(shù)： | 10/41頁 |
| 文件大?。?/td> | 437K |
| 代理商： | DS87C530 |
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DS87C530/DS83C530
070898 10/41
NONVOLATILE RAM
The 1K x 8 on–chip SRAM can be nonvolatile if an exter-
nal backup energy–source is used. This allows the de-
vice to log data or to store configuration settings. Inter-
nal switching circuits will detect the loss of V
CC
and
switch SRAM power to the backup source on the V
BAT
pin. The 256 bytes of direct RAM are not affected by this
circuit and are volatile.
CRYSTAL AND BACKUP SOURCES
To
use
the
unique
DS87C530/DS83C530, a 32.768 KHz timekeeping
crystal and a backup energy–source are needed. The
following describes guidelines for choosing these
devices.
functions
of
the
Timekeeping Crystal
The DS87C530/DS83C530 can use a standard 32.768
KHz crystal as the RTC time base. There are two ver-
sions of standard crystals available, with 6 pF and 12.5
pF load capacitance. The tradeoff is that the 6 pF uses
less power, giving longer life while V
CC
is off, but is more
sensitive to noise and board layout. The 12.5 pF crystal
uses more power, giving a shorter battery backed life,
but produces a more robust oscillator. Bit 6 in the RTC
Trim register (TRIM; 96h) must be programmed to spec-
ify the crystal type for the oscillator. When TRIM.6 = 1,
the circuit expects a 12.5 pF crystal. When TRIM.6 = 0, it
expects a 6 pF crystal. This bit will be nonvolatile so
these choices will remain while the backup source is
present. A guard ring (connected to the Real Time
Clock ground) should encircle the RTCX1 and RTCX2
pins.
Backup Energy Source
The DS87C530/DS83C530 uses an external energy
source to maintain timekeeping and SRAM data without
V
CC
. This source can be either a battery or 0.47 F super
cap and should be connected to the V
BAT
pin. The nomi-
nal battery voltage is 3V. The V
BAT
pin will not source
current. Therefore, a super cap requires an external
resistor and diode to supply charge.
The backup lifetime is a function of the battery capacity
and the data retention current drain. This drain is speci-
fied in the electrical specifications. The circuit loads the
V
BAT
only when V
CC
has fallen below V
BAT
. Thus the
actual lifetime depends not only on the current and bat-
tery capacity, but also on the portion of time without
power. A very small lithium cell provides a lifetime of
more than 10 years.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS87C530_05 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM Microcontrollers with Real-Time Clock |
| DS87C530_1 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:EPROM/ROM Micro with Real Time Clock |
| DS87C530+ECL | 制造商:Maxim Integrated Products 功能描述:MICRO OTP RTC 33MHZ 52P TQFP PB-FRR - Trays |
| DS87C530-ECL | 功能描述:8位微控制器 -MCU EPROM MCU w/RTC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
| DS87C530-ECL+ | 功能描述:8位微控制器 -MCU EPROM MCU w/RTC RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
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