- 您现在的位置：买卖IC网 > PDF目录69017 > M48T212V-85MH1E (STMICROELECTRONICS) REAL TIME CLOCK, PDSO44 PDF资料下载
参数资料
| 型号： | M48T212V-85MH1E |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | REAL TIME CLOCK, PDSO44 |
| 封装： | 0.330 INCH, ROHS COMPLIANT, PLASTIC, SOH-44 |
| 文件页数： | 14/35页 |
| 文件大小： | 348K |
| 代理商： | M48T212V-85MH1E |
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页当前第14页第15页第16页第17页第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
Obsolete
Product(s)
- Obsolete
Product(s)
M48T212V
Clock operation
perform a software reset of the watchdog timer, the original time-out period can be written
into the Watchdog Register, effectively restarting the count-down cycle.
Should the watchdog timer time-out, and the WDS Bit is programmed to output an interrupt,
a value of 00h needs to be written to the Watchdog Register in order to clear the IRQ/FT pin.
This will also disable the watchdog function until it is again programmed correctly. A READ
of the Flags Register will reset the Watchdog Flag (Bit D7; Register 0h).
The watchdog function is automatically disabled upon power-down and the Watchdog
Register is cleared. If the watchdog function is set to output to the IRQ/FT pin and the
frequency test function is activated, the watchdog or alarm function prevails and the
frequency test function is denied.
3.7
VCC switch output
Vccsw output goes low when VOUT switches to VCC turning on a customer supplied P-
Channel MOSFET (see Figure 3 on page 8). The Motorola MTD20P06HDL is
recommended. This MOSFET in turn connects VOUT to a separate supply when the current
simply to indicate the status of the internal battery switchover comparator, which controls the
source (VCC or battery) of the VOUT output.
3.8
Power-on reset
The M48T212V continuously monitors VCC. When VCC falls to the power fail detect trip
point, the RST pulls low (open drain) and remains low on power-up for trec after VCC passes
VPFD (max). The RST pin is an open drain output and an appropriate pull-up resistor to VCC
should be chosen to control rise time.
Note:
If the RST output is fed back into either of the RSTIN inputs (for a microprocessor with a bi-
directional reset) then a 1k
Ω (max) pull-up resistor is recommended.
3.9
Reset inputs (RSTIN1 & RSTIN2)
The M48T212V provides two independent inputs which can generate an output reset. The
duration and function of these resets is identical to a reset generated by a power cycle.
RST is enabled (tR1HRH & tR2HRH), the Reset Inputs are ignored.
Note:
RSTIN1 and RSTIN2 are each internally pulled up to VCC through a 100KΩ resistor.
相关PDF资料 |
PDF描述 |
|---|---|
| M48T35V-10PC1 | 1 TIMER(S), REAL TIME CLOCK, PDIP28 |
| M48T35V-10MH1 | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M48T35V-10MH1TR | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M48T512V-85PM1 | 0 TIMER(S), REAL TIME CLOCK, PDIP32 |
| M48T512V-70PM1 | REAL TIME CLOCK, PDIP32 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T212V-85MH1F | 功能描述:监控电路 SRAM TK 16X8 85ns RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| M48T212V-85MH1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212V-85MH6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212V-85MH6E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212V-85MH6F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
发布紧急采购，3分钟左右您将得到回复。