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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： | 5/40页 |
| 文件大小： | 817K |
| 代理商： | MCP79401T-I/SN |
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2011 Microchip Technology Inc.
DS25009B-page 13
MCP7940X
ALMxC2:0: These Configuration bits determine
the alarm match. The logic will trigger the alarm
based on one of the following match conditions:
The 12/24-hour bits 0xCh.6 and 0x13h.6 are cop-
ies of the bit in 0x02h.6. The bits are read-only.
0x18h-0x1Bh are used for the timesaver function.
These registers are loaded at the time when VCC fails
and the RTCC operates on the VBAT. The VBAT bit is
also set at this time. These registers are cleared when
the VBAT bit is cleared in software.
0x1Ch-0x1Fh are used for the timesaver function.
These registers are loaded at the time when VCC is
restored and the RTCC switches to VDD. These
registers are cleared when the VBAT bit is cleared in
software.
4.2
FEATURES
4.2.1
UNLOCK SEQUENCE
The unique ID location is user accessible by using the
unlock ID sequence.
The unique ID location is 64-bits (8 bytes) and is
stored in EEPROM locations 0xF0 to 0xF7. This
location can be read at any time, however, a write is
inhibited until unlocked.
To unlock the write access to this location the following
sequence must be completed:
A single write of 0x55h to address 0x09. Stop
A single write of 0xAAh to address 0x09. Stop
This will allow the unique EEPROM locations to be
written.
After the byte or page write to these locations, the
write sequence is initiated by the Stop condition. At
this time, the ID locations are locked and no further
writes are possible to this location unless a complete
unlock sequence is repeated.
000 – Seconds match
001 – Minutes match
010 – Hours match (takes into account 12/24
hour)
011 – Matches the current day, interrupt at
12.00.00 a.m. Example: 12 midnight on
100
–Date
101
– RESERVED
110
– RESERVED
111
– Seconds, Minutes, Hour, Day, Date,
Month
Note:
It is strongly recommended that the
timesaver function only be used when the
oscillator is running. This will ensure
accurate functionality.
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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