m41st87w STMicroelectronics, m41st87w Datasheet - Page 16

• Manufacturer Part Number: m41st87w
• Description: 5.0, 3.3, Or 3.0v, 1280 Bit 160 X8 Secure Serial Rtc And Nvram Supervisor With Tamper Detection
• Manufacturer: STMicroelectronics

M41ST87Y, M41ST87W
Tamper Connect Mode Bit (TCM1 and TCM2).
This bit indicates whether the position of the exter-
nal switch selected by the user is in the Normally
Open
(TCM
Figure 16., page
Figure 14. Tamper Detect Connection Options
Note: These options are connected to those in Table 3.
Note: 1. If the CLRX
Table 3. Tamper Detection Truth Table
Note: 1. No battery current drawn during battery back-up.
16/42
Option
NORMALLY
2. If the CLRX
3. Optional external resistor to V
NORMALLY
(TCM X = 1)
(TCM X = 0)
X
CLOSED
IV
III
II
OPEN
I
= '0') position (see
(TCM
X
EXT
EXT
Normally Open/Tamper to GND
Normally Open/Tamper to V
Normally Closed/Tamper to GND
Normally Closed/Tamper to V
= '1')
17).
III.
I.
Bit is set, a second Tamper to V
Bit is set, a second Tamper to V
V OUT
TP IN
TCHI/TCLO = 1
or
Figure 14., page 16
(2)
CC
Normally
TAMPER LO
(TPM X = 0)
allows the user to bypass sampling when power is “on.”
1M
TP IN
Mode
OUT
OUT
Closed
OUT
OUT
(1)
TCHI/TCLO = 0
(1)
10M
and
(TPM2 = '1') during t
(TPM2 = '1') will trigger automatically.
Tamper Polarity Mode Bits (TPM1 and TPM2).
The state of this bit indicates whether the Tamper
Pin Input will be taken high (to V
or low (to V
(see
16., page
IV.
II.
V CC
CLR
Figure
(3)
17).
will not be detected.
SS
TCHI/TCLO = 1
if TPM
TCM
14., page 16
TAMPER HI
(TPM X = 1)
1
1
0
0
1M
TP IN
V OUT
X
X
= '0') during a tamper event
(1)
V OUT (Int)
TCHI/TCLO = 0
10M
OUT
and
if TPM
TPM
0
1
0
1
AI07075
X
X
Figure
= '1')