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參數(shù)資料
| 型號： | DS1501-DS1511 |
| 英文描述： | Y2K-Compliant Watchdog Real-Time Clocks |
| 中文描述： | 千年蟲的看門狗實(shí)時時鐘 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 265K |
| 代理商： | DS1501-DS1511 |
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
13 of 20
The third method of reading the time and date uses the alarm function. The alarm can be configured to activate
once per second, and the time-of-day alarm-interrupt enable bit (TIE) is enabled. The TE bit should always be
enabled. When the
IRQ
pin goes active, the time and date information does not change until the next update.
SETTING THE CLOCK
It is recommended to halt updates to the external set of double-buffered RTC registers when writing to the clock.
The (TE) bit should be used as described above before loading the RTC registers with the desired RTC count (day,
date, and time) in 24-hour BCD format. Setting the TE bit to 1 transfers the new values written to the internal RTC
registers and allows normal operation to resume.
CLOCK ACCURACY
The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match between
the capacitive load of the oscillator circuit and the capacitive load for which the crystal was trimmed. Additional
error is added by crystal frequency drift caused by temperature shifts. External circuit noise coupled into the
oscillator circuit can result in the clock running fast.
A standard 32.768kHz quartz crystal should be directly connected to the DS1501 X1 and X2 oscillator pins. The
crystal selected for use should have a specified load capacitance (C
L
) of either 6pF or 12.5pF, and the CS bit set
accordingly. An external 32.768kHz oscillator can also drive the DS1501. When using an external oscillator the X2
pin must be left open. The DS1511 contains an embedded crystal and is factory trimmed to be better than ±1
min/month at +25
°
C.
Refer to
Application Note 58: Crystal Considerations for Dallas Real-Time Clocks
for detailed information.
Table 2. Register Map
DATA
B4
ADDRESS
B7
0
0
0
0
0
EOSC
B6
B5
B3
B2
B1
B0
FUNCTION
BCD
RANGE
00–59
00–59
00–23
1–7
01–31
01–12
00–99
00–39
00–59
00–59
00–23
1–7/1–31
00–99
00–99
00–FF
00–FF
00H
01H
02H
03H
04H
05H
06H
07H
08H
09H
0AH
0BH
0CH
0DH
0EH
0FH
10H
11H
12H
13H
14H-1FH
10 Seconds
10 Minutes
10 Hours
0
10 Date
BB32
10 Year
10 Century
10 Seconds
10 Minutes
0
Dy/Dt
0.1 Second
10 Second
BLF2
PRS
CS
BME
Seconds
Minutes
Hour
Seconds
Minutes
Hours
Day
Date
Month
Year
Century
Alarm Seconds
Alarm Minutes
Alarm Hours
Alarm Day/Date
Watchdog
Watchdog
Control A
Control B
RAM Address
RAM Data
0
0
0
0
0
Day
Date
Month
Year
Century
Seconds
Minutes
Hour
Day/Date
0.01 Second
Second
KSF
KIE
E32K
10 Month
AM1
AM2
AM3
AM4
10 Hours
10 Date
BLF1
TE
PAB
TPE
TDF
TIE
WDF
WDE
IRQF
WDS
Extended RAM Address
Reserved
Reserved
Extended RAM Data
Reserved
Note:
0 = 0 and are read only.
POWER-UP DEFAULT STATES
These bits are set upon power-up:
EOSC
= 0,
E32K
= 0, TIE = 0, KIE = 0, WDE = 0, and WDS = 0. Unless
otherwise specified, the state of the control/RTC/SRAM bits in the DS1501/DS1511 is not defined upon initial
power application; the DS1501/DS1511 should be properly configured/defined during initial configuration.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1501YSN | Hook-Up Wire; Conductor Size AWG:24; No. Strands x Strand Size:7 x 32; Jacket Color:White; Approval Bodies:UL, CSA; Approval Categories:UL AWM Styles 1007, 1565; CSA Types TR-64, TRSR-64; JQA-F; Passes VW-1 Flame Test RoHS Compliant: Yes |
| DS1501WEN | Y2K-Compliant Watchdog Real-Time Clocks |
| DS1501YN | Y2K-Compliant Watchdog Real-Time Clocks |
| DS1511W | Y2K-Compliant Watchdog Real-Time Clocks |
| DS1511Y | Y2K-Compliant Watchdog Real-Time Clocks |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS1501W | 功能描述:IC RTC WDOG Y2KC 3.3V 28-DIP RoHS:否 類別:集成電路 (IC) >> 時鐘/計(jì)時 - 實(shí)時時鐘 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:時鐘/日歷 特點(diǎn):警報器，閏年，SRAM 存儲容量:- 時間格式:HH:MM:SS（12/24 小時） 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 |
| DS1501W+ | 功能描述:實(shí)時時鐘 Y2K-Compliant Watchdog 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1501WE | 功能描述:實(shí)時時鐘 Y2K-Compliant Watchdog 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1501WE/T&R | 制造商:Maxim Integrated Products 功能描述:IC RTC WDOG Y2KC 3.3V 28-TSOP |
| DS1501WE/T&R | 功能描述:實(shí)時時鐘 Y2K-Compliant Watchdog 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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