- 您现在的位置：买卖IC网 > PDF目录45050 > M48T201Y-70MH1F (STMICROELECTRONICS) 1 TIMER(S), REAL TIME CLOCK, PDSO44 PDF资料下载
参数资料
| 型号： | M48T201Y-70MH1F |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| 封装： | SNAPHAT, ROHS COMPLIANT, PLASTIC, SOIC-44 |
| 文件页数： | 18/37页 |
| 文件大小： | 311K |
| 代理商： | M48T201Y-70MH1F |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页
M48T201Y, M48T201V
Clock operation
If a battery low indication is generated during the 24-hour interval check, this indicates that
the battery is near end of life. However, data is not compromised due to the fact that a
nominal VCC is supplied. In order to insure data integrity during subsequent periods of
battery backup mode, the battery should be replaced. The SNAPHAT top may be replaced
while VCC is applied to the device.
Note:
This will cause the clock to lose time during the interval the battery/crystal is removed.
The M48T201Y/V only monitors the battery when a nominal VCC is applied to the device.
Thus applications which require extensive durations in the battery backup mode should be
powered-up periodically (at least once every few months) in order for this technique to be
beneficial. Additionally, if a battery low is indicated, data integrity should be verified upon
power-up via a checksum or other technique.
3.12
Initial power-on defaults
Upon application of power to the device, the following register bits are set to a '0' state:
WDS; BMB0-BMB4; RB0-RB1; AFE; ABE; SQWE; W; R; FT (see Table 9).
Table 9.
Default values
Condition
W
R
FT
AFE
ABE
SQWE
Watchdog
register(1)
1.
WDS, BMB0-BMB4, RB0, RB1.
Initial power-up
(Battery attach for
SNAPHAT)(2)
2.
State of other control bits undefined.
000
0
RESET(3)
3.
State of other control bits remains unchanged.
000
0
Power-down(4)
4.
Assuming these bits set to '1' prior to power-down.
000
111
0
相关PDF资料 |
PDF描述 |
|---|---|
| M48T201V-85MH1F | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201Y-70MH1 | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201V-85MH1E | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201Y-70MH1E | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201V-85MH6TR | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T201Y-70MH1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3V TIMEKEEPER㈢ supervisor |
| M48T201Y-80MH1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
| M48T201Y-80MH1E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
| M48T201Y-80MH1F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
| M48T201Y-80MH1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
发布紧急采购，3分钟左右您将得到回复。