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參數(shù)資料
| 型號： | DS1687-3+C01 |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 14/34頁 |
| 文件大小： | 0K |
| 描述： | IC RTC 3V 64-BIT Y2K 24-EDIP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 14 |
| 類型： | 時鐘/日歷 |
| 特點： | 警報器，NVSRAM，方波輸出，Y2K |
| 存儲容量： | 242B |
| 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： | 2.7 V ~ 3.7 V |
| 電壓 - 電源，電池： | 2.5 V ~ 3.7 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 24-DIP 模塊（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 24-EDIP |
| 包裝： | 管件 |
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DS1685/DS1687 3V/5V Real-Time Clocks
21 of 34
128 x 8 EXTENDED RAM
The DS1685/DS1687 provides 128 x 8 of on-chip SRAM, which is controlled as nonvolatile storage sustained by
VBAT and/or VBAUX. On power-up, the RAM is accessible after TREC.
The on-chip 128 x 8 NV SRAM is accessed by the eight multiplexed address/data lines AD7–AD0. Access to the
SRAM is controlled by two on-chip latch registers. One register is used to hold the SRAM address and the other
register is used to hold read/write data. The SRAM address space is from 00h to 7Fh.
Access to the extended 128 x 8 RAM is controlled by two of the registers shown in Figure 5. The registers in bank
1 must first be selected by setting the DV0 bit in register A to a logic 1. The 7-bit address of the RAM location to be
accessed must be loaded into the extended RAM address register located at 50h. Data in the addressed location
may be read by performing a read operation from location 53h, or written to by performing a write operation to
location 53h. Data in any addressed location may be read or written repeatedly without changing the address in
location 50h.
EXTENDED CONTROL REGISTERS
Two extended control registers are provided to supply controls and status information for the extended features
offered by the DS1685/DS1687. These are designated as extended control registers 4A and 4B and are located in
register bank 1, locations 04Ah and 04Bh, respectively. The functions of the bits within these registers are
described as follows.
Extended Control Register 4A
MSB
LSB
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
VRT2
INCR
*
PAB
RF
WF
KF
VRT2 – This status bit gives the condition of the auxiliary battery. It is set to a logic 1 condition when the external
lithium battery is connected to the VBAUX. If this bit is read as a logic 0, the external battery should be replaced.
INCR – Increment-in-Progress status bit. This bit is set to a 1 when an increment to the time/date registers is in
progress and the alarm checks are being made. INCR is set to a 1 at 122s before the update cycle starts and is
cleared to 0 at the end of each update cycle.
PAB – Power-Active Bar control bit. When this bit is 0, the PWR pin is in the active-low state. When this bit is 1, the
PWR pin is in the high-impedance state. This bit can be written to a logic 1 or 0 by the user. If either WF and WIE =
1 or KF and KSE = 1, the PAB bit is cleared to 0.
RF – Ram Clear Flag. This bit is set to a logic 1 when a high-to-low transition occurs on the RCLR input if RCE = 1.
The RF bit is cleared by writing it to a logic 0. This bit can also be written to a logic 1 to force an interrupt condition.
WF – Wake-Up Alarm Flag. This bit is set to 1 when a wake-up alarm condition occurs or when the user writes it to
a 1. WF is cleared by writing it to a 0.
KF – Kickstart Flag. This bit is set to a 1 when a kickstart condition occurs or when the user writes it to a 1. This bit
is cleared by writing it to a logic 0.
*Reserved bits. These bits are reserved for future use by Maxim Integrated. They can be read and written, but have no affect on operation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1687-3IND | 功能描述:實時時鐘 3V/5V 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 |
| DS1687-3IND_12 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:3V/5V Real-Time Clocks |
| DS1687-3IND+ | 功能描述:實時時鐘 3V/5V 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 |
| DS16875 | 制造商:DALLAS 功能描述:* |
| DS1687-5 | 功能描述:實時時鐘 3V/5V 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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