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参数资料
| 型号： | M41ST87YMX6TR |
| 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： | 19/48页 |
| 文件大小： | 457K |
| 代理商： | M41ST87YMX6TR |
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Operating modes
M41ST87Y, M41ST87W
2.10
Avoiding inadvertent tampers (normally closed
configuration)
In some applications it may be necessary to use a low pass filter to reduce electrical noise
on the tamper input pin when the TCMX bit = 0 (normally closed). This is especially true if
the tamper detect switch is located some distance (> 6”) from the tamper input pin. A low
pass filter can prevent unwanted, higher frequency noise from inadvertently being detected
as a tamper condition caused by the “antenna-effect” (produced by a longer signal wire or
mesh). This low pass filter can be constructed using a series resistor (R) in conjunction with
a capacitor (C) on the tamper input pin.
The cut-off frequency fc is determined according to the formula:
Figure 20.
Low-pass filter implementation for noise immunity
Table 6.
Calculated cut-off frequency for typical capacitance and resistance
values
R (
Ω)C (F)
fc
1/fc (s)
1000
1.00E-09
15.9 MHz
6.28 s
1000
1.00E-06
159.2 Hz
6.28 ms
5000
1.00E-09
31.8 kHz
31.4 s
5000
1.00E-06
31.8 Hz
31.4 ms
10000
1.00E-09
15.9 kHz
62.8 s
10000
1.00E-06
15.9 Hz
62.8 ms
f
c
12 Pi R C
()
=
TPIN
R
C
To Tamper Detect Switch
AI11185
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M41ST87YSS6 | 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 |
| M41ST87YSS6F | 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 |
| M41ST95W | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor |
| M41ST95WMH6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor |
| M41ST95WMH6E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor |
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