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參數(shù)資料
| 型號(hào)： | DS17887-5 |
| 英文描述： | Real-Time Clock |
| 中文描述： | 實(shí)時(shí)時(shí)鐘 |
| 文件頁數(shù)： | 4/38頁 |
| 文件大?。?/td> | 515K |
| 代理商： | DS17887-5 |
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DS17885/DS17887
4 of 38
WR
(RTC Write Input; active low) -
The
WR
signal is an active low signal. The
WR
signal defines
the time period during which data is written to the addressed register.
CS
(RTC Chip Select Input; active low) -
The Chip Select signal must be asserted low during a bus
cycle for DS17885/DS17887 to be accessed.
CS
must be kept in the active state during
RD
and
WR
timing. Bus cycles which take place with ALE asserted but without asserting
CS
will latch addresses.
However, no data transfer will occur.
IRQ
(Interrupt Request Output; open drain, active low) -
The
IRQ
pin is an active low output of the
DS17885/DS17887 that can be tied to the interrupt input of 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. To
clear the
IRQ
pin, the application software must clear all enabled flag bits contributing to
IRQ
’s active
state.
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. The
IRQ
pin is an open drain output and requires
an external pullup resistor. The voltage on the pull up supply should be no greater than V
CC
+ 0.2 volt.
PWR
(Power On Output; open drain, active low) -
The
PWR
pin is intended for use as an on/off
control for the system power. With V
CC
voltage removed from the DS17885/DS17887,
PWR
may be
automatically activated from a Kickstart input via the
KS
pin or from a Wake-Up interrupt. Once the
system is powered on, the state of
PWR
can be controlled via bits in the Dallas registers. For 5-volt
operation, the voltage of the pull up supply should be no greater than 5.7 volts. For 3-volt operation, the
voltage on the pull up supply should be no greater than 3.9 volts.
KS
(Kickstart Input; active low) -
When V
CC
is removed from the DS17885/DS17887, the system can
be powered on in response to an active low transition on the
KS
pin, as might be generated from a key
closure. V
BAUX
must be present and Auxiliary Battery Enable bit (ABE) must be set to 1 if the Kickstart
function is used, and the
KS
pin must be pulled up to the V
BAUX
supply. While V
CC
is applied, the
KS
pin can be used as an interrupt input.
RCLR
(RAM Clear Input; active low) -
If enabled by software, taking
RCLR
low will result in the
clearing of the 114 bytes of user RAM. When enabled,
RCLR
can be activated whether or not V
CC
is
present.
V
BAUX
-
Auxiliary battery input required for kickstart and wake-up features. This input also supports
clock/ calendar and user RAM if V
BAT
is at lower voltage or is not present. A standard +3-volt lithium
cell or other energy source can be used. For 3-volt operation, V
BAUX
must be held between +2.5 and
+3.7 volts. For 5-volt operation, V
BAUX
must be held between +2.5 and +5.2 volts . If V
BAUX
is not going
to be used it should be grounded and auxiliary battery enable bit bank 1, register 4BH, should=0.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS17887-5 IND | 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 |
| DS17887-5+ | 功能描述:實(shí)時(shí)時(shí)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(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 |
| DS17887-5IND | 功能描述:IC RTC 5V 8K NV RAM 24-EDIP 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 供應(yīng)商設(shè)備封裝:8-TDFN EP 包裝:管件 |
| DS17887-5IND+ | 功能描述:實(shí)時(shí)時(shí)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(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 |
| DS17H531D | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:3-PHASE STEPPING SYSTEMS |
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