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FM31T376-G 参数 Datasheet PDF下载

FM31T376-G图片预览
型号: FM31T376-G
PDF下载: 下载PDF文件 查看货源
内容描述: 系统监控器和温度补偿实时时钟( TCXO )与内嵌晶体 [System Supervisor & Temperature Compensated RTC(TCXO) with Embedded Crystal]
分类和应用: 晶体电源电路电源管理电路石英晶振温度补偿晶振光电二极管监控时钟
文件页数/大小: 26 页 / 796 K
品牌: RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
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FM31T372/374/376/378-G  
.
.
2900 ms  
1
1
1
1
1
1
1
1
1
0
1
1
1
0
1
3000 ms  
Disable counter  
09h  
Watchdog Restart & Flags  
D7  
D6  
D5  
D4  
D3  
D2  
WR2  
D1  
D0  
WTR  
POR  
LB  
-
WR3  
WR1  
WR0  
WTR  
POR  
LB  
Watchdog Timer Reset Flag: When a watchdog timer fault occurs, the WTR bit will be set to 1. It must be cleared  
by the user. Note that both WTR and POR could be set if both reset sources have occurred since the flags were  
cleared by the user. Battery-backed. Read/Write (internally set, user can clear bit).  
Power-on Reset Flag: When the /RST pin is activated by a VDD < VTP condition, the POR bit will be set to 1. It  
must be cleared by the user. Note that both WTR and POR could be set if the reset source has occurred since the  
flags were cleared by the user. Battery-backed. Read/Write (internally set, user can clear bit).  
Low Backup Flag: On power up, if the VBAK source is below the minimum voltage to operate the RTC and event  
counters, this bit will be set to 1. The user should clear it to 0 when initializing the system. Battery-backed.  
Read/Write (internally set, user can clear bit).  
WR3-0  
Watchdog Restart: Writing a pattern 1010b to WR3-0 restarts the watchdog timer. The upper nibble contents do  
not affect this operation. Writing any pattern other than 1010b to WR3-0 has no effect on the timer. This allows  
users to clear the WTR, POR, and LB flags without affecting the watchdog timer. Battery-backed, Write-only.  
08h  
07h  
06h  
05h  
04h  
03h  
Timekeeping Years  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
10 year.3  
10 year.2  
10 year.1  
10 year.0  
Year.3  
Year.2  
Year.1  
Year.0  
Contains the lower two BCD digits of the year. Lower nibble contains the value for years; upper nibble contains  
the value for 10s of years. Each nibble operates from 0 to 9. The range for the register is 0-99. Battery-backed,  
read/write.  
Timekeeping Months  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
0
0
0
10 Month  
Month.3  
Month.2  
Month.1  
Month.0  
Contains the BCD digits for the month. Lower nibble contains the lower digit and operates from 0 to 9; upper  
nibble (one bit) contains the upper digit and operates from 0 to 1. The range for the register is 1-12.  
Battery-backed, read/write.  
Timekeeping Date of the month  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
0
0
10 date.1  
10 date.0  
Date.3  
Date.2  
Date.1  
Date.0  
Contains the BCD digits for the date of the month. Lower nibble contains the lower digit and operates from 0 to 9;  
upper nibble contains the upper digit and operates from 0 to 3. The range for the register is 1-31. Battery-backed,  
read/write.  
Timekeeping Day of the week  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
0
0
0
0
0
Day.2  
Day.1  
Day.0  
Lower nibble contains a value that correlates to day of the week. Day of the week is a ring counter that counts  
from 1 to 7 then returns to 1. The user must assign meaning to the day value, as the day is not integrated with the  
date. Battery-backed, read/write.  
Timekeeping Hours  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
0
0
10 hours.1  
10 hours.0  
Hours.3  
Hours2  
Hours.1  
Hours.0  
Contains the BCD value of hours in 24-hour format. Lower nibble contains the lower digit and operates from 0 to  
9; upper nibble (two bits) contains the upper digit and operates from 0 to 2. The range for the register is 0-23.  
Battery-backed, read/write.  
Timekeeping Minutes  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
0
10 min.2  
10 min.1  
10 min.0  
Min.3  
Min.2  
Min.1  
Min.0  
Contains the BCD value of minutes. Lower nibble contains the lower digit and operates from 0 to 9; upper nibble  
contains the upper minutes digit and operates from 0 to 5. The range for the register is 0-59. Battery-backed,  
read/write.  
Rev. 1.1  
Apr. 2011  
Page 14 of 26  
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