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參數(shù)資料
| 型號： | DS12885Q |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 2/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC RTC W/RAM 128 BYTE 28-PLCC |
| 標準包裝： | 37 |
| 類型： | 時鐘/日歷 |
| 特點： | 警報器，夏令時，閏年，NVSRAM，方波輸出 |
| 存儲容量： | 114B |
| 時間格式： | HH:MM:SS（12/24 小時） |
| 數(shù)據(jù)格式： | YY-MM-DD-dd |
| 接口： | 并聯(lián) |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 電壓 - 電源，電池： | 2.5 V ~ 4 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-LCC（J 形引線） |
| 供應商設備封裝： | 28-PLCC（11.51x11.51） |
| 包裝： | 管件 |
DS12885/DS12887/DS12887A/DS12C887/DS12C887A
Real-Time Clocks
10
____________________________________________________________________
Pin Description (continued)
PIN
SO,
PDIP
EDIP
PLCC
TQFP
NAME
FUNCTION
19
23
21
IRQ
Active-Low Interrupt Request Output. The IRQ pin is an active-low output of the
device that can be used as an interrupt input to a processor. The IRQ output
remains low as long as the status bit causing the interrupt is present and the
corresponding interrupt-enable bit is set. The processor program normally
reads the C register to clear the IRQ pin. The RESET pin also clears pending
interrupts. When no interrupt conditions are present, the IRQ level is in the high-
impedance state. Multiple interrupting devices can be connected to an IRQ
bus, provided that they are all open drain. The IRQ pin is an open-drain output
and requires an external pullup resistor to VCC.
20
—
24
22
VBAT
Connection for a Primary Battery. (DS12885 Only.) Battery voltage must be held
between the minimum and maximum limits for proper operation. If a backup
supply is not supplied, VBAT must be grounded. Connect the battery directly to
the VBAT pin. Diodes in series between the VBAT pin and the battery may
prevent proper operation. UL recognized to ensure against reverse charging
when used with a lithium battery.
21
(DS12887A/
DS12C887A)
25
24
RCLR
Active-Low RAM Clear. The RCLR pin is used to clear (set to logic 1) all the
general-purpose RAM, but does not affect the RAM associated with the RTC. To
clear the RAM, RCLR must be forced to an input logic 0 during battery-backup
mode when VCC is not applied. The RCLR function is designed to be used
through a human interface (shorting to ground manually or by a switch) and not
to be driven with external buffers. This pin is internally pulled up. Do not use an
external pullup resistor on this pin.
23
27
26
SQW
Square-Wave Output. The SQW pin can output a signal from one of 13 taps
provided by the 15 internal divider stages of the RTC. The frequency of the
SQW pin can be changed by programming Register A, as shown in Table 1.
The SQW signal can be turned on and off using the SQWE bit in Register B. The
SQW signal is not available when VCC is less than VPF.
24
28
VCC
DC Power Pin for Primary Power Supply. When VCC is applied within normal
limits, the device is fully accessible and data can be written and read. When
VCC is below VPF reads and writes are inhibited.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS12885Q/T&R | 制造商:Rochester Electronics LLC 功能描述: 制造商:DSC 功能描述: |
| DS12885Q/T&R | 功能描述:實時時鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12885Q+ | 功能描述:實時時鐘 RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12885Q+T&R | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:REAL TIME CLOCK MULTIPLEXED 114BYTE 28PLCC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RTC W/RAM 128 BYTE 28-PLCC 制造商:Maxim Integrated Products 功能描述:Real Time Clock RTC |
| DS12885Q+T&R | 功能描述:實時時鐘 RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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