參數(shù)資料
型號： M48T37Y-10MH6TR
廠商： STMICROELECTRONICS
元件分類： 時鐘/數(shù)據(jù)恢復及定時提取
英文描述： 0 TIMER(S), REAL TIME CLOCK, PDSO44
封裝： 0.330 INCH, PLASTIC, SOIC-44
文件頁數(shù)： 9/29頁
文件大?。?/td> 276K
代理商： M48T37Y-10MH6TR
M48T37Y, M48T37V
Clock operations
The watchdog timer resets when the microprocessor performs a re-write of the Watchdog
Register or an edge transition (low to high / high to low) on the WDI pin occurs. The time-out
period then starts over.
The watchdog timer is disabled by writing a value of 00000000 to the eight bits in the
Watchdog Register. Should the watchdog timer time-out, a value of 00h needs to be written
to the Watchdog Register in order to clear the IRQ/FT pin.
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. The WDI pin should be connected to VSS if not used.
3.7
Power-on reset
The M48T37Y/V 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. RST is valid for all VCC conditions. The RST pin is an open drain output and
an appropriate resistor to VCC should be chosen to control rise time (see Figure 13 on
3.8
Programmable Interrupts
The M48T37Y/V provides two programmable interrupts: an alarm and a watchdog. When an
interrupt condition occurs, the M48T37Y/V sets the appropriate flag bit in the Flag Register
7FF0h. The interrupt enable bits (AFE and ABE) in 7FF6h and the Watchdog Steering
(WDS) Bit in 7FF7h allow the interrupt to activate the IRQ/FT pin.
The Alarm flag and the IRQ/FT output are cleared by a READ to the Flags Register. An
interrupt condition reset will not occur unless the addresses are stable at the flag location for
at least 15ns while the device is in the READ Mode as shown in Figure 7 on page 14.
The IRQ/FT pin is an open drain output and requires a pull-up resistor (10k
Ω
recommended) to VCC. The pin remains in the high impedance state unless an interrupt
occurs or the Frequency Test Mode is enabled.
3.9
Battery low flag
The M48T37Y/V automatically performs periodic battery voltage monitoring upon power-up.
The Battery Low Flag (BL), Bit D4 of the Flags Register 7FF0h, will be asserted high if the
SNAPHAT battery is found to be less than approximately 2.5V. The BL Flag will remain
active until completion of battery replacement and subsequent battery low monitoring tests
during the next power-up sequence.
If a battery low is generated during a power-up sequence, this indicates the battery voltage
is below 2.5V (approximately), which may be insufficient to maintain data integrity. Data
should be considered suspect and verified as correct. A fresh battery should be installed.
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.
Note:
Battery monitoring is a useful technique only when performed periodically. The M48T37Y/V
only monitors the battery when a nominal VCC is applied to the device. Thus applications
相關(guān)PDF資料
PDF描述
M48T37V-70MH6E REAL TIME CLOCK, PDSO44
M48T37V-70MH6 0 TIMER(S), REAL TIME CLOCK, PDSO44
M48T37Y-70MH1F 0 TIMER(S), REAL TIME CLOCK, PDSO44
M48T37Y-70MH6TR 0 TIMER(S), REAL TIME CLOCK, PDSO44
M48T37Y-70MH1E 0 TIMER(S), REAL TIME CLOCK, PDSO44
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M48T37Y-70MH1 功能描述:實時時鐘 256K (32Kx8) 70ns 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
M48T37Y-70MH1E 功能描述:實時時鐘 256K (32Kx8) 70ns 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
M48T37Y-70MH1F 功能描述:實時時鐘 256K (32Kx8) 70ns 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
M48T37Y-70MH1TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER? SRAM
M48T37Y-70MH6 功能描述:實時時鐘 256K (32Kx8) 70ns 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
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