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參數(shù)資料
| 型號(hào)： | DS17485-DS17487 |
| 英文描述： | 3V/5V Real-Time Clock |
| 中文描述： | 3V/5V實(shí)時(shí)時(shí)鐘 |
| 文件頁數(shù)： | 22/38頁 |
| 文件大?。?/td> | 427K |
| 代理商： | DS17485-DS17487 |
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DS17485/DS17487
22 of 38
EXTENDED CONTROL REGISTER 4B
MSB
BIT 7
BIT 6
ABE
E32k
ABE –
Auxiliary Battery Enable.
This bit when written to a logic 1 enables the V
BAUX
pin for extended
functions.
E32k –
Enable 32.768kHz Output.
This bit when written to a logic 1 enables the 32.768kHz oscillator
frequency to be output on the SQW pin. E32k is set to a 1 when V
CC
is powered up.
CS –
Crystal Select.
When CS is set to a 0, the oscillator is configured for operation with a crystal that
has a 6pF specified load capacitance. When CS = 1, the oscillator is configured for a 12.5pF crystal. CS is
disabled in the DS17487 module and should be set to CS = 0.
RCE – RAM Clear Enable
. When set to a 1, this bit enables a low level on
RCLR
to clear all 114 bytes
of user RAM. When RCE = 0,
RCLR
and the RAM clear function are disabled.
PRS – PAB Reset Select
. When set to a 0, the
PWR
pin is set high-z when the DS17485 goes into power
fail. When set to a 1, the
PWR
pin remains active upon entering power fail.
RIE – RAM Clear Interrupt Enable.
When RIE is set to a 1, the
IRQ
pin is driven low when a RAM
clear function is completed.
WIE – Wake-up Alarm Interrupt Enable.
When V
CC
voltage is absent and WIE is set to a 1, the
PWR
pin is driven active low when a wake-up condition occurs, causing the WF bit to be set to 1. When V
CC
is
then applied, the
IRQ
pin is also driven low. If WIE is set while system power is applied, both
IRQ
and
PWR
are driven low in response to WF being set to 1. When WIE is cleared to a 0, the WF bit has no
affect on the
PWR
or
IRQ
pins.
KSE – Kickstart Interrupt Enable.
When V
CC
voltage is absent and KSE is set to a 1, the
PWR
pin is
driven active low when a kickstart condition occurs (
KS
pulsed low), causing the KF bit to be set to 1.
When V
CC
is then applied, the
IRQ
pin is also driven low. If KSE is set to 1 while system power is
applied, both
IRQ
and
PWR
are driven low in response to KF being set to 1. When KSE is cleared to a 0,
the KF bit has no affect on the
PWR
or
IRQ
pins.
LSB
BIT 0
KSE
BIT 5
CS
BIT 4
RCE
BIT 3
PRS
BIT 2
RIE
BIT 1
WIE
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS17485 | 3V/5V Real-Time Clock |
| DS17485E-3 | 3V/5V Real-Time Clock |
| DS17485E-5 | 3V/5V Real-Time Clock |
| DS17485EN-3 | 3V/5V Real-Time Clock |
| DS17485EN-5 | 3V/5V Real-Time Clock |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS17485E3 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Real-Time Clocks |
| DS17485E-3 | 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 |
| DS17485E-3+ | 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 |
| DS17485E5 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Real-Time Clocks |
| DS17485E-5 | 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 |
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