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参数资料
| 型号： | M41ST87WMX6 |
| 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, PDSO28 |
| 封装： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOX-28 |
| 文件页数： | 30/52页 |
| 文件大小： | 689K |
| 代理商： | M41ST87WMX6 |
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Clock operation
M41ST87Y, M41ST87W
Doc ID 9497 Rev 8
Should the watchdog timer time-out, and the WDS bit is programmed to output an interrupt,
either a transition of the WDI pin, or a value of 00h needs to be written to the watchdog
register in order to clear the IRQ/OUT 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 0Fh) but does not clear the IRQ/OUT pin.
The watchdog function is automatically disabled upon power-up and the watchdog register
is cleared.
3.5
Square wave output
The M41ST87Y/W offers the user a programmable square wave function which is output on
the SQW/FT pin. RS3-RS0 bits located in 13h establish the square wave output frequency.
These frequencies are listed in Table 9. Once the selection of the SQW frequency has been
completed, the SQW/FT pin can be turned on and off under software control with the square
wave enable bit (SQWE) located in Register 0Ah.
The SQW/FT output is programmable as an N-channel, open drain output driver, or a full-
CMOS output driver. By setting the square wave open drain bit (SQWOD) to a '1,' the output
SQWOD is set to '0,' the output will be configured as full-CMOS (sink and source current as
specified in Table 17 on page 44).
Note:
When configured as open drain (SQWOD = '1'), the SQW/FT pin requires an external pull-
up resistor.
Table 9.
Square wave output frequency
Square wave bits
Square wave
RS3
RS2
RS1
RS0
Frequency
Units
0000
None
–
0001
32.768
kHz
0010
8.192
kHz
0011
4.096
kHz
0100
2.048
kHz
0101
1.024
kHz
0110
512
Hz
0111
256
Hz
1000
128
Hz
1001
64
Hz
1010
32
Hz
1011
16
Hz
11008
Hz
11014
Hz
11102
Hz
11111
Hz
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M41ST87WMX6F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM |
| M41ST87WMX6TR | 功能描述:实时时钟 Serial 1280 (160x8) 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 |
| M41ST87WSS6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM |
| M41ST87WSS6F | 功能描述:实时时钟 128 NVRAM Serial RTC 3.0 to 3.6 Vcc 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 |
| M41ST87Y | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0, 3.3, or 3.0V, 1280 bit (160 x8) Secure Serial RTC and NVRAM Supervisor with Tamper Detection |
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