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| 型號(hào)： | DS17487 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3 Volt/5 Volt Real Time Clock(3V/5V實(shí)時(shí)時(shí)鐘) |
| 文件頁(yè)數(shù)： | 7/32頁(yè) |
| 文件大?。?/td> | 236K |
| 代理商： | DS17487 |
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DS17485/DS17487
030598 7/32
TIME, CALENDAR AND ALARM DATA MODES
Table 1
LOCATION
FUNCTION
RANGE
RANGE
ADDRESS
DECIMAL
BINARY DATA MODE
BCD DATA MODE
00H
Seconds
0–59
00–3B
00–59
01H
Seconds Alarm
0–59
00–3B
00–59
02H
Minutes
0–59
00–3B
00–59
03H
Minutes Alarm
0–59
00–3B
00–59
04H
Hours 12–hr. Mode
1–12
01-0C AM, 81-8C PM
01-12 AM, 81-92 PM
Hours 24–Hour Mode
0–23
00–17
00–23
05H
Hours Alarm 12-hr. Mode
1–12
01-0C AM, 81-8C PM
01-12AM, 81-92 PM
Hours Alarm 24-hr. Mode
0–23
00–17
00–23
06H
Day of Week Sunday=1
1–7
01–07
01–07
07H
Date of Month
1–31
01–1F
01–31
08H
Month
1–12
01–0C
01–12
09H
Year
0–99
00–63
00–99
BANK 1, 48H
Century
0–99
00–63
00–99
BANK 1, 49H
Date Alarm
1–31
01–1F
01–31
CONTROL REGISTERS
The four control registers; A, B, C, and D reside in both
bank 0 and bank 1. These registers are accessible at all
times, even during the update cycle.
NONVOLATILE RAM – RTC
The general purpose nonvolatile RAM bytes are not
dedicated to any special function within the
DS17485/DS17487. They can be used by the applica-
tion program as nonvolatile memory and are fully avail-
able during the update cycle.
The user RAM is divided into two separate memory
banks. When the bank 0 is selected, the 14 real time
clock registers and 114 bytes of user RAM are accessi-
ble. When bank 1 is selected, an additional 4K bytes of
user RAM are accessible through the extended RAM
address and data registers.
INTERRUPT CONTROL
The DS17485/DS17487 includes six separate, fully
automatic sources of interrupt for a processor:
1. Alarm interrupt
2. Periodic interrupt
3. Update–ended interrupt
4. Wake up interrupt
5. Kickstart interrupt
6. RAM clear interrupt
The conditions which generate each of these indepen-
dent interrupt conditions are described in greater detail
elsewhere in this data sheet. This section describes the
overall control of the interrupts.
The application software can select which interrupts, if
any, are to be used. There are a total of six bits including
three bits in Register B and three bits in Extended Reg-
ister 4B which enable the interrupts. The extended reg-
ister locations are described later. Writing a logic 1 to an
interrupt enable bit permits that interrupt to be initiated
when the event occurs. A logic 0 in the interrupt enable
bit prohibits the IRQ pin from being asserted from that
interrupt condition. If an interrupt flag is already set
when an interrupt is enabled, IRQ will immediately be
set at an active level, even though the event initiating the
interrupt condition may have occurred much earlier. As
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS17487-3 | 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 |
| DS17487-3+ | 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 |
| DS17487-3IND | 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 |
| DS17487-3IND+ | 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 |
| DS174875 | 制造商:Maxim Integrated Products 功能描述: |
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