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M41ST87YMX6TR Datasheet(PDF) 19 Page - STMicroelectronics

Part # M41ST87YMX6TR
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

M41ST87YMX6TR Datasheet(HTML) 19 Page - STMicroelectronics

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M41ST87Y, M41ST87W
Operating modes
19/48
Figure 13.
Tamper detect connection options
Note:
These options are connected to those in Table 3.
1.
If the CLRXEXT bit is set, a second tamper to VOUT (TPM2 = '1') during tCLR will not be detected.
2.
If the CLRXEXT bit is set, a second tamper to VOUT (TPM2 = '1') will trigger automatically.
3.
Optional external resistor to VCC allows the user to bypass sampling when power is “on.”
Table 3.
Tamper detection truth table
Option
Mode
TCMX
TPMX
I
Normally open/tamper to GND(1)
1.
No battery current drawn during battery backup.
10
II
Normally open/tamper to VOUT
(1)
11
III
Normally closed/tamper to GND
0
0
IV
Normally closed/tamper to VOUT
01
AI07075
TPIN
TAMPER HI
(TPMX = 1)
TAMPER LO
(TPMX = 0)
VOUT
(1)
TPIN
NORMALLY
CLOSED
(TCMX = 0)
NORMALLY
OPEN
(TCMX = 1)
I.
IV.
II.
III.
TPIN
VOUT
(2)
TCHI/TCLO = 0
1M
Ω
10M
Ω
TCHI/TCLO = 1
TCHI/TCLO = 0
TCHI/TCLO = 1
1M
Ω
10M
Ω
VOUT (Int)
VCC
(3)



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