參數(shù)資料
型號： MCP79402-I/SN
廠商： Microchip Technology
文件頁數(shù)： 3/15頁
文件大小： 0K
描述： IC RTCC 64BIT SRAM I2C 8SOIC
標準包裝： 100
類型： 時鐘/日歷
特點： 警報器，閏年，方波輸出，SRAM，唯一 ID
存儲容量： 64B
時間格式： HH:MM:SS（12/24 小時）
數(shù)據(jù)格式： YY-MM-DD-dd
接口： I²C，2 線串口
電源電壓： 1.8 V ~ 5.5 V
電壓 - 電源，電池： 1.3 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOICN
包裝： 管件
2011 Microchip Technology Inc.
DS25009C-page 11
MCP7940X
5.0
RTCC FUNCTIONALITY
The MCP7940X family is a highly integrated RTCC.
On-board time and date counters are driven from a low-
power oscillator to maintain the time and date. An
integrated VCC switch enables the device to maintain
the time and date and also the contents of the SRAM
during a VCC power failure.
5.1
RTCC MEMORY MAP
The RTCC registers are contained in addresses
0x00h-0x1fh. 64 bytes of user-accessable SRAM are
located in the address range 0x20-0x5f. The SRAM
memory is a separate block from the RTCC control
and Configuration registers. All SRAM locations are
battery-backed-up during a VCC power fail. Unused
locations are not accessible, MCP7940X will noACK
after the address byte if the address is out of range, as
shown in the shaded region of the memory map in
Figure 5-1. The shaded areas are not implemented
and read as ‘0’. No error checking is provided when
loading time and date registers.
Addresses 0x00h-0x06h are the RTCC Time and
Date registers. These are read/write registers.
Care must be taken when writing to these regis-
ters while the oscillator is running.
Incorrect data can appear in the Time and Date
registers if a write is attempted during the time-
frame where these internal registers are being
incremented. The user can minimize the likeli-
hood of data corruption by insuring that any writes
to the Time and Date registers occur before the
contents of the second register reach a value of
0x59H.
Addresses 0x07h-0x09h are the device Configu-
ration, Calibration and ID Unlock registers.
Addresses 0x0Ah-0x10h are the Alarm 0 regis-
ters. These are used to set up the Alarm 0, the
Interrupt polarity and the Alarm 0 compare.
Addresses 0x11h-0x17h are the same as 0x0Bh-
0x11h but are used for Alarm 1.
Addresses 0x18h-0x1Fh are used for the time-
stamp feature.
The detailed memory map is shown in Table 5-1.
FIGURE 5-1:
MEMORY MAP
0x00
0x06
Time and Date
Configuration and Calibration
Alarm 0
Alarm 1
Time-Stamp
SRAM (64 Bytes)
0x07
0x09
0x0A
0x10
0x11
0x17
0x18
0x1F
0x20
0x5F
0x60
0xFF
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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
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