- 您现在的位置：买卖IC网 > PDF目录69016 > M41T0DW6F (STMICROELECTRONICS) REAL TIME CLOCK, PDSO8 PDF资料下载
参数资料
| 型号： | M41T0DW6F |
| 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, PDSO8 |
| 封装： | TSSOP-8 |
| 文件页数： | 5/19页 |
| 文件大小： | 236K |
| 代理商： | M41T0DW6F |
13/19
M41T0
CLOCK OPERATION
The M41T0 is driven by a quartz controlled oscilla-
tor with a nominal frequency of 32.768kHz. The
accuracy of the Real-Time Clock depends on the
frequency of the quartz crystal that is used as the
time-base for the RTC. The M41T0 is tested to
meet ± 35 ppm with nominal crystal. The eight-
byte Clock Register (see Table 8, page 14) is used
to both set the clock and to read the date and time
from the clock, in a binary coded decimal format.
Seconds, Minutes, and Hours are contained within
the first three registers. Bits D6 and D7 of Clock
Register 2 (Hours Register) contain the CENTU-
RY ENABLE Bit (CEB) and the CENTURY Bit
(CB). Setting CEB to a '1' will cause CB to toggle,
either from '0' to '1' or from '1' to '0' at the turn of
the century (depending upon its initial state). If
CEB is set to a '0', CB will not toggle. Bits D0
through D2 of Register 3 contain the Day (day of
week). Registers 4, 5 and 6 contain the Date (day
of month), Month and Years. The final register is
the Control Register. Bit D7 of Register 0 contains
the STOP Bit (ST). Setting this bit to a '1' will cause
the oscillator to stop. If the device is expected to
spend a significant amount of time on the shelf, the
oscillator may be stopped to reduce current drain.
When reset to a '0' the oscillator restarts within
four seconds (typically one second).
The seven clock registers may be read one byte at
a time, or in a sequential block. The Control Reg-
ister (Address location 7) may be accessed inde-
pendently. Provision has been made to assure
that a clock update does not occur while any of the
seven clock addresses are being read. If a clock
address is being read, an update of the clock reg-
isters will be delayed by 250ms to allow the READ
to be completed before the update occurs. This
will prevent a transition of data during the READ.
Note: This 250ms delay affects only the clock reg-
ister update and does not alter the actual clock
time.
Output Driver Pin
The OUT pin is an output driver that reflects the
contents of D7 of the Control Register. In other
words, when D7 of location 7 is a '0' then the OUT
pin will be driven low.
Note: The OUT pin is open drain which requires
an external pull-up resistor.
Oscillator Stop Detection
If the Oscillator Fail (OF) Bit is internally set to a '1,'
this indicates that the oscillator has either stopped,
or was stopped for some period of time and can be
used to judge the validity of the clock and date da-
ta. This bit will be set to '1' any time the oscillator
stops. The following conditions can cause the OF
Bit to be set:
– The first time power is applied (defaults to a '1'
on power-up).
– The voltage present on VCC is insufficient to
support oscillation.
– The ST Bit is set to '1.'
– External interference or removal of the crystal.
This bit will remain set to '1' until written to logic '0.'
The oscillator must start and have run for at least
4 seconds before attempting to reset the OF Bit to
'0.' This function operates both under normal pow-
er and in battery back-up.
Initial Power-on Defaults
Upon initial application of power to the device, the
OUT Bit and OF Bit will be set to a '1,' while the ST
Bit will be set to '0.' All other Register bits will ini-
tially power-on in a random state.
相关PDF资料 |
PDF描述 |
|---|---|
| M41T0DW6 | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| M41T0DW6TR | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| M41T0M6F | REAL TIME CLOCK, PDSO8 |
| M41T11MHTR | 0 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M41T256YMT7TR | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M41T0EVM | 制造商:P&S 功能描述:M41T0 Evaluation Board, and a CD of Development Data 制造商:P&S 功能描述:M41T0 Evaluation Board,CD of Development |
| M41T0M | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:SERIAL REAL-TIME CLOCK |
| M41T0M6 | 功能描述:实时时钟 ENV 511-M41T0M6E 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 |
| M41T0M6E | 功能描述:实时时钟 Serial 64 (8X8) 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 |
| M41T0M6F | 功能描述:实时时钟 Serial 64 (8X8) 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 |
发布紧急采购，3分钟左右您将得到回复。