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M41ST87WMX6TR Datasheet(PDF) 26 Page - STMicroelectronics

Part # M41ST87WMX6TR
Description  5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41ST87WMX6TR Datasheet(HTML) 26 Page - STMicroelectronics

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Operating modes
M41ST87Y, M41ST87W
26/48
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 µs
1000
1.00E-06
159.2 Hz
6.28 ms
5000
1.00E-09
31.8 kHz
31.4 µs
5000
1.00E-06
31.8 Hz
31.4 ms
10000
1.00E-09
15.9 kHz
62.8 µs
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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