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参数资料
| 型号： | M41T50Q6F |
| 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, QCC16 |
| 封装： | 3 X 3 MM, LEAD FREE, QFN-16 |
| 文件页数： | 6/23页 |
| 文件大小： | 288K |
| 代理商： | M41T50Q6F |
M41T50
14/23
Square Wave Output
The M41T50 offers the user a 1Hz square wave
function which is output on the SQW pin. The
SQW pin can be turned on and off under software
control with the Square Wave Enable Bit (SQWE)
located in Register 0Ah.
The SQW output is programmable as an N-chan-
nel, open drain output driver, or a full CMOS out-
put driver. The initial power-up default for the SQW
output is disabled, in the full-CMOS (or Push-pull
mode). By setting the Square Wave Open Drain
Bit (SQWOD in address 0Ch) to a '1,' the output
will be configured as an open drain (with IOL as
specified in Table 9., page 17). When SQWOD is
set to '0,' the output will be configured as full-
CMOS (sink and source current as specified in Ta-
Note:
When
configured
as
Open
Drain
(SQWOD = '1'), the SQW pin requires an external
pull-up resistor.
Century Bits
These two bits will increment in a binary fashion at
the turn of the century, and handle all leap years
correctly. See Table 5., page 14 for additional ex-
planation.
Output Driver Pin
When the AFE Bit is not set to generate an inter-
rupt, the IRQ/OUT pin becomes an output driver
that reflects the contents of D7 of the Out Register.
In other words, when D7 (OUT Bit) is a '0,' then the
IRQ/OUT pin will be driven low.
Note: The IRQ/OUT pin is an open drain which re-
quires an external pull-up resistor.
Initial Power-on Defaults
Upon application of power to the device, the regis-
ter bits will initially power-on in the state indicated
in Table 4.
Table 4. Initial Power-on Default Values
Note: 1. All other control bits power-up in an undetermined state.
Table 5. Century Bits Examples
Note: 1. Leap year occurs every four years (for years evenly divisible by four), except for years evenly divisible by 100. The only exceptions
are those years evenly divisible by 400 (the year 2000 was a leap year, year 2100 is not).
Condition
ST
SQWOD
OUT
AFE
SQWE
60Hz
Initial
Power-up(1)
001
00
1
CB0
CB1
Leap Year?
Example(1)
00
Yes
2000
0
1
No
2100
1
0
No
2200
1
No
2300
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