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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： | 35/52页 |
| 文件大小： | 689K |
| 代理商： | M41ST87WMX6 |
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Clock operation
M41ST87Y, M41ST87W
Doc ID 9497 Rev 8
The M41ST87Y/W only monitors the battery when a nominal VCC is applied to the device.
Thus applications which require extensive durations in the battery back-up mode should be
powered-up periodically (at least once every few months) in order for this technique to be
beneficial. Additionally, if a battery low is indicated, data integrity should be verified upon
power-up via a checksum or other technique.
3.14
trec bit
Bit D7 of clock register 04h contains the trec bit (TR). trec refers to the automatic continuation
of the deselect time after VCC reaches VPFD. This allows for a voltage settling time before
WRITEs may again be performed to the device after a power-down condition. The trec bit will
allow the user to set the length of this deselect time as defined by Table 12.
Table 12.
trec definitions
3.15
Electronic serial number
The M41ST87Y/W has a unique 8-byte lasered serial number with parity. This serial number
is “read only” and is generated such that no two devices will contain an identical number.
3.16
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 data. 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 or battery is insufficient to support oscillation.
●
The ST bit is set to '1.'
If the oscillator fail interrupt enable bit (OFIE) is set to a '1,' the IRQ/OUT pin will also be
asserted. The IRQ/OUT output is cleared by resetting the OF bit to '0,' resetting the OFIE bit
to '0,' or if the RST output is asserted (but is NOT cleared by reading the flag register).
The OF 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 power and in battery backup. If the trigger event occurs during a power-
down condition, this bit will be set correctly.
Note:
The ABE bit must be set to '1' for the IRQ/OUT pin to be activated in battery backup.
trec bit (TR)
STOP bit (ST)
trec time
Units
Min
Max
0
96
98(1)
1.
Default setting.
ms
01
40
200
ms
1
X
50
2000
s
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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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