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| 型号： | MCP79401T-I/SN |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | REAL TIME CLOCK, PDSO8 |
| 封装： | 3.90 MM, PLASTIC, SOP-8 |
| 文件页数： | 10/40页 |
| 文件大小： | 817K |
| 代理商： | MCP79401T-I/SN |
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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.
相关PDF资料 |
PDF描述 |
|---|---|
| MCP79400T-I/SN | REAL TIME CLOCK, PDSO8 |
| MCP79400-I/MS | REAL TIME CLOCK, PDSO8 |
| MCP79401-I/ST | REAL TIME CLOCK, PDSO8 |
| MCP79400T-I/MS | REAL TIME CLOCK, PDSO8 |
| MCP79402-I/ST | REAL TIME CLOCK, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP79402 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:I2C? Real-Time Clock/Calendar with SRAM, Unique ID and Battery Switchover |
| MCP79402-I/MS | 功能描述:实时时钟 I2C GP RTCC 64B SRAM EUI-64 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| MCP79402-I/SN | 功能描述:实时时钟 I2C GP RTCC 64B SRAM EUI-64 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| MCP79402-I/ST | 功能描述:实时时钟 I2C GP RTCC 64B SRAM EUI-64 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| MCP79402T-I/MNY | 功能描述:实时时钟 I2C GP RTCC 64B SRAM EUI-64 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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