M41ST87WMX6F STMICROELECTRONICS [STMicroelectronics], M41ST87WMX6F Datasheet - Page 20

• Manufacturer Part Number: M41ST87WMX6F
• 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
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Operating modes
Figure 14. Tamper detect connection options
Note:
1. If the CLRX
2. If the CLRX
3. Optional external resistor to V
Table 3.
1. No battery current drawn during battery backup.
20/52
Option
NORMALLY
NORMALLY
(TCM X = 1)
(TCM X = 0)
CLOSED
IV
III
II
OPEN
I
EXT
EXT
These options are summarized in
Tamper detection truth table
bit is set, a second tamper to V
bit is set, a second tamper to V
Normally open/tamper to GND
Normally open/tamper to V
Normally closed/tamper to GND
Normally closed/tamper to V
III.
I.
V OUT (2)
TP IN
TCHI/TCLO = 1
CC
allows the user to bypass sampling when power is “on.”
TAMPER LO
(TPM X = 0)
TP IN
Mode
OUT
OUT
OUT
OUT
(1)
(1)
Doc ID 9497 Rev 8
TCHI/TCLO = 0
(TPM2 = '1') during t
(TPM2 = '1') will trigger automatically.
Table
3.
IV.
II.
CLR
V CC
(3)
will not be detected.
TCHI/TCLO = 1
TCM
TAMPER HI
(TPM X = 1)
1
1
0
0
V OUT
TP IN
X
M41ST87Y, M41ST87W
(1)
V OUT (Int)
TCHI/TCLO = 0
TPM
0
1
0
1
AI07075
X