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| 型號： | MCP79402-I/MS |
| 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： | ROHS COMPLIANT, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 10/40頁 |
| 文件大小： | 817K |
| 代理商： | MCP79402-I/MS |
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MCP7940X
DS25009B-page 18
2011 Microchip Technology Inc.
5.0
ON BOARD MEMORY
The MCP7940X has both on-board Unique ID memory
and battery-backed SRAM. The SRAM is arranged as
64 x 8 bytes and is retained when the VCC supply is
removed, provided the VBAT supply is present and
enabled. The Unique ID is nonvolatile memory and
does not require the VBAT supply for retention.
5.1
SRAM
FIGURE 5-1:
SRAM/RTCC BYTE WRITE
FIGURE 5-2:
SRAM/RTCC MULTIPLE BYTE WRITE
The 64 bytes of user SRAM are at location 0x20h and
can be accessed during an RTCC update. Upon POR
the SRAM will be in an undefined state.
Writing to the SRAM and RTCC is accomplished in a
similar way to writing to the EEPROM (as described
later in this document) with the following consider-
ations:
There is no page. The entire 64 bytes of SRAM or
32 bytes of RTCC register can be written in one
command.
The SRAM allows an unlimited number of read/
write cycles with no cell wear out.
The RTCC and SRAM are not accessible when
the device is running on the external VBAT.
The RTCC and SRAM are separate blocks. The
SRAM array may be accessed during an RTCC
update.
Read and write access is limited to either the
RTCC register block or the SRAM array. The
Address Pointer will rollover to the start of the
addressed block.
Data written to the RTCC and SRAM are on a per
byte basis.
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
S
T
A
R
T
CONTROL
BYTE
ADDRESS
BYTE
DATA
S
T
O
P
A
C
K
A
C
K
A
C
K
S 1 101
0
1 11
P
x
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
S
T
A
R
T
CONTROL
BYTE
ADDRESS
BYTE
DATA BYTE 0
S
T
O
P
A
C
K
A
C
K
A
C
K
DATA BYTE N
A
C
K
S 11 0 1
0
111
P
x
Note:
Entering an address past 5F for an SRAM
operation will result in the MCP7940X not
acknowledging the address.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| MCP79402T-I/MNY | 功能描述:實時時鐘 I2C GP RTCC 64B SRAM EUI-64 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 |
| MCP79402T-I/MS | 功能描述:實時時鐘 I2C GP RTCC 64B SRAM EUI-64 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 |
| MCP79402T-I/SN | 功能描述:實時時鐘 I2C GP RTCC 64B SRAM EUI-64 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 |
| MCP79402T-I/ST | 功能描述:實時時鐘 I2C GP RTCC 64B SRAM EUI-64 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 |
| MCP7940M | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Low-Cost I2Ca?￠ Real-Time Clock/Calendar with SRAM |
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