參數(shù)資料
型號(hào)： DS1689SN+T&R
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 34/36頁(yè)
文件大?。?/td> 0K
描述： IC RTC SER NV RAM CTRL IN 28SOIC
標(biāo)準(zhǔn)包裝： 1,000
類型： 時(shí)鐘/日歷
特點(diǎn)： NVSRAM
存儲(chǔ)容量： 114B
時(shí)間格式： HH:MM:SS（12/24 小時(shí)）
數(shù)據(jù)格式： YY-MM-DD-dd
接口： 并聯(lián)
電源電壓： 2.7 V ~ 3.3 V，4.5 V ~ 5.5 V
電壓 - 電源，電池： 2.5 V ~ 3.7 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 28-SOIC
包裝： 帶卷 (TR)
DS1689/DS1693
7 of 36
POWER-DOWN/POWER-UP CONSIDERATIONS
The real-time clock function will continue to operate and all of the RAM, time, calendar, and alarm
memory locations remain nonvolatile regardless of the level of the VCCI input. When VCCI is applied to
the DS1689/DS1693 and reaches a level of greater than VPF (power fail trip point), the device becomes
accessible after tREC, provided that the oscillator is running and the oscillator countdown chain is not in
reset (see Register A). This time period allows the system to stabilize after power is applied.
When PSEL is floating or logic 0, the DS1689 is in autosense mode and 3V or 5V operation is
determined based on the voltage on VCCI. Selection of 5V operation is automatically invoked when VCCI
rises above 4.5V for a minimum of tREC. However, 3V operation is automatically selected if VCCI does not
rise above the level of 4.25V. Selection of the power supply input levels requires 150ms of input stability
before operation can commence.
When 5V operation is selected, the device is fully accessible and data can be written and read only when
VCCI is greater than 4.5V. When VCCI is below 4.5V, read and writes are inhibited. However, the
timekeeping function continues unaffected by the lower input voltage. As VCC falls below the greater of
VBAT and VBAUX, the RAM and timekeeper are switched over to a lithium battery connected either to the
VBAT pin or VBAUX pin.
When 3V operation is selected and applied within normal limits, the device is fully accessible and data
can be written or read. When VCCI falls below VPF, access to the device is inhibited. If VPF is less than
VBAT and VBAUX, the power supply is switched from VCCI to the backup supply (the greater of VBAT and
VBAUX) when VCCI drops below VPF. If VPF is greater than VBAT and VBAUX, the power supply is switched
from VCCI to the backup supply when VCCI drops below the larger of VBAT and VBAUX.
When VCC falls below VPF, the chip is write-protected. With the possible exception of the KS, PWR, and
SQW pins, all inputs are ignored and all outputs are in a high impedance state.
RTC ADDRESS MAP
The address map for the RTC registers of the DS1689/DS1693 is shown in Figure 2. The address map
consists of the 14-clock/calendar registers. Ten registers contain the time, calendar, and alarm data, and
four bytes are used for control and status. All registers can be directly written or read except for the
following:
1. Registers C and D are read-only.
2. Bit 7 of Register A is read-only.
3. The high order bit of the seconds byte is read-only.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1689S-TRL 功能描述:IC RTC SER W/NV RAM CTRL 28-SOIC RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 實(shí)時(shí)時(shí)鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時(shí)鐘/日歷 特點(diǎn):警報(bào)器，閏年，SRAM 存儲(chǔ)容量:- 時(shí)間格式:HH:MM:SS（12/24 小時(shí)） 數(shù)據(jù)格式:YY-MM-DD-dd 接口:SPI 電源電壓:2 V ~ 5.5 V 電壓 - 電源，電池:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件
DS1691 功能描述:實(shí)時(shí)時(shí)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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
DS1691 WAF 制造商:Texas Instruments 功能描述:
DS1691/1692 WAF 制造商:Texas Instruments 功能描述:
DS1691A 制造商:NSC 制造商全稱:National Semiconductor 功能描述:(RS-422/RS-423) Line Drivers with TRI-STATE Outputs
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