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| 型號： | MCP79411-I/MNY |
| 元件分類： | 時鐘/數(shù)據(jù)恢復(fù)及定時提取 |
| 英文描述： | REAL TIME CLOCK, PDSO8 |
| 封裝： | 2 X 3 MM, 0.75 MM HEIGHT, ROHS COMPLAINT, PLASTIC, TDFN-8 |
| 文件頁數(shù)： | 9/40頁 |
| 文件大小： | 584K |
| 代理商： | MCP79411-I/MNY |
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2010-2011 Microchip Technology Inc.
DS22266C-page 17
MCP7941X
4.2.7
POWER-FAIL TIME-STAMP
The MCP7941X family of RTCC devices feature a
power-fail time-stamp feature. This feature will store
the time at which VCC crosses the VTRIP voltage and is
shown in Figure 4-4. To use this feature, a VBAT
supply must be present and the oscillator must also be
running.
There are two separate sets of registers that are used
to record this information:
The first set, located at 0x18h through 0x1Bh, is
loaded at the time when VCC falls below VTRIP
and the RTCC operates on the VBAT. The VBAT
(register 0x03h bit 4) bit is also set at this time.
The second set of registers, located at 0x1Ch
through 0x1Fh, is loaded at the time when VCC is
restored and the RTCC switches to VCC.
The power-fail time-stamp registers are cleared when
the VBAT bit is cleared in software.
FIGURE 4-4:
POWER-FAIL GRAPH
VCC
VTRIP(max)
VTRIP(min)
V
CCF
T
V
CCRT
Power-Down
Power-Up
Time Stamp
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| MCP79411T-I/MNY | 功能描述:實(shí)時時鐘 I2C GP RTCC 1Kb EE 64B SRAM EUI-48 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 |
| MCP79411T-I/MS | 功能描述:實(shí)時時鐘 I2C GP RTCC 1Kb EE 64B SRAM EUI-48 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 |
| MCP79411T-I/SN | 功能描述:實(shí)時時鐘 I2C GP RTCC 1Kb EE 64B SRAM EUI-48 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 |
| MCP79411T-I/ST | 功能描述:實(shí)時時鐘 I2C GP RTCC 1Kb EE 64B SRAM EUI-48 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 |
| MCP79412 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:I2C? Real-Time Clock/Calendar with EEPROM, SRAM, Unique ID and Battery Switchover |
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