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参数资料
| 型号： | DS1386P |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | RAMified Watchdog Timekeeper(带完整功能的实时时钟静态RAM) |
| 中文描述： | RAMified看门狗计时器 |
| 文件页数： | 3/16页 |
| 文件大小： | 183K |
| 代理商： | DS1386P |
DS1386/DS1386P
070298 3/16
DATA RETENTION
The RAMified Timekeeper provides full functional capa-
bility when V
CC
is greater than 4.5 volts and write-pro-
tects the register contents at 4.25 volts typical. Data is
maintained in the absence of V
CC
without any additional
support circuitry. The DS1386 constantly monitors V
CC
.
Should the supply voltage decay, the RAMified Time-
keeper will automatically write–protect itself and all in-
puts to the registers become “don’t care”. The two inter-
rupts INTA and INTB (INTB) and the internal clock and
timers continue to run regardless of the level of V
CC
.
However, it is important to insure that the pull–up resis-
tors used with the interrupt pins are never pulled up to a
value that is greater than V
CC
+ 0.3V. As V
CC
falls below
approximately 3.0 volts, a power switching circuit turns
the internal lithium energy source on to maintain the
clock and timer data and functionality. It is also required
to insure that during this time (battery backup mode),
the voltage present at INTA and INTB(INTB) does never
exceed 3.0V. During power–up, when V
CC
rises above
approximately 3.0 volts, the power switching circuit con-
nects external V
CC
and disconnects the internal lithium
energy source. Normal operation can resume after V
CC
exceeds 4.5 volts for a period of 200 ms.
RAMIFIED TIMEKEEPER REGISTERS
The RAMified Timekeeper has 14 registers which are
eight bits wide that contain all of the timekeeping, alarm,
watchdog and control information. The clock, calendar,
alarm, and watchdog registers are memory locations
which contain external (user–accessible) copies of the
timekeeping data. The external copies are independent
of internal functions except that they are updated peri-
odically by the simultaneous transfer of the incremented
internal copy (see Figure 1). The Command Register
bits are affected by both internal and external functions.
This register will be discussed later. The 8K or 32K by-
tes of RAM and the 14 external timekeeping registers
are accessed from the external address and data bus.
Registers 0, 1, 2, 4, 6, 8, 9, and A contain time of day and
date information (see Figure 2). Time of day information
is stored in BCD. Registers 3, 5, and 7 contain the Time
of Day Alarm information. Time of Day Alarm informa-
tion is stored in BCD. Register B is the Command Reg-
ister and information in this register is binary. Registers
C and D are the Watchdog Alarm Registers and infor-
mation which is stored in these two registers is in BCD.
Registers E through 1FFF or 7FFF are user bytes and
can be used to maintain data at the user’s discretion.
CLOCK ACCURACY (DIP MODULE)
The DS1386 is guaranteed to keep time accuracy to
within
±
1 minute per month at 25
°
C.
CLOCK ACCURACY (POWERCAP MODULE)
The DS1386P and DS9034PCX are each individually
tested for accuracy. Once mounted together, the mod-
ule is guaranteed to keep time accuracy to within
±
1.53
minutes per month (35 ppm) at 25
°
C.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1386P08-120 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:RAMified Watchdog Timekeeper |
| DS1386P08-150 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock |
| DS1386P-32-120 | 功能描述:IC TIMEKEEPER RAM 256K 32-PCM RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 类型:时钟/日历 特点:警报器，闰年，SRAM 存储容量:- 时间格式:HH:MM:SS（12/24 小时） 数据格式:YY-MM-DD-dd 接口:SPI 电源电压:2 V ~ 5.5 V 电压 - 电源，电池:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN EP 包装:管件 |
| DS1386P32-120 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:RAMified Watchdog Timekeeper |
| DS1386P-32-120+ | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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