M41ST87WMX6F STMICROELECTRONICS [STMicroelectronics], M41ST87WMX6F Datasheet - Page 23

• 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]

M41ST87Y, M41ST87W
Table 4.
1. When calculating battery lifetime, this current should be added to I
2. Per tamper detect input
Figure 17. Tamper detect sampling options
TDS
0
0
1
1
X
TCHI/TCLO
negative voltage generated by the charge pump during a tamper condition, and from being
pulled to ground by the output of the charge pump when it is in shut-down mode (SHDN =
logic low). The gates of both MOSFETs should be connected to TP
Figure 20 on page
the output of the inverting charge pump and the V
should be an enhancement mode p-channel, and placed between V
and V
n-channel MOSFET will turn on and the p-channel will turn off. During normal operating
conditions, TP
Tamper detection current (normally closed - TCM
V
V
CC
CC
0
1
0
1
CC
(V
(V
OUT
OUT
of the external SRAM. When TP
X
)
)
NORMALLY CLOSED
NORMALLY CLOSED
NORMALLY OPEN
NORMALLY OPEN
Continuous monitoring / 10 MΩ pull-up/-down
Continuous monitoring / 1 MΩ pull-up/-down
Sampling (1Hz) / 10 MΩ pull-up/-down
Sampling (1Hz) / 1 MΩ pull-up/-down
TAMPER LO,
TAMPER LO,
TAMPER HI,
TAMPER HI,
CLR
will be low and the p-channel will be on, while the n-channel will be off.
25. One n-channel enhancement MOSFET should be placed between
Tamper circuit mode
V
CC
(V
Doc ID 9497 Rev 8
OUT
)
CLR
CONTINUOUS
CONTINUOUS
CONTINUOUS
CONTINUOUS
MONITORING
MONITORING
MONITORING
MONITORING
MONITORING
MONITORING
BAT
SAMPLED
SAMPLED
goes high after a tamper condition occurs, the
current listed in
OUT
X
TDS
TDS
TDS
TDS
of the M41ST87. The other MOSFET
= '0')
X
X
X
X
= 0
= 1
= 0
= 1
Current at 3.0 V (typ)
Table 17 on page
Configuration
User
TCM
CLR
OUT
0.3
3.0
0.3
3.0
AI07819
X
, TPM
as shown in
of the M41ST87
Operating modes
X
44.
(1)(2)
Unit
µA
µA
nA
nA
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