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M41ST87Y Arkusz danych(PDF) 22 Page - STMicroelectronics

Numer części M41ST87Y
Szczegółowy opis  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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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41ST87Y Arkusz danych(HTML) 22 Page - STMicroelectronics

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Operating modes
M41ST87Y, M41ST87W
22/48
the output of the inverting charge pump and the VOUT of the M41ST87. The other MOSFET
should be an enhancement mode p-channel, and placed between VOUT of the M41ST87
and VCC of the external SRAM. When TPCLR goes high after a tamper condition occurs, the
n-channel MOSFET will turn on and the p-channel will turn off. During normal operating
conditions, TPCLR will be low and the p-channel will be on, while the n-channel will be off.
Table 4.
Tamper detection current (normally closed - TCMX = '0')
Figure 16.
Tamper detect sampling options
TDSX
TCHI/TCLOX
Tamper circuit mode
Current at 3.0 V (typ)(1)(2)
1.
When calculating battery lifetime, this current should be added to IBAT current listed in Table 17 on page 42.
2.
Per tamper detect input
Unit
0
0
Continuous monitoring / 10 M
Ω pull-up/-down
0.3
µA
0
1
Continuous monitoring / 1 M
Ω pull-up/-down
3.0
µA
1
0
Sampling (1Hz) / 10 M
Ω pull-up/-down
0.3
nA
1
1
Sampling (1Hz) / 1 M
Ω pull-up/-down
3.0
nA
AI07819
TAMPER LO,
NORMALLY OPEN
TAMPER HI,
NORMALLY CLOSED
User
Configuration
TDS
X = 0
TDS
X = 1
TDS
X = 0
TDS
X = 1
TAMPER HI,
NORMALLY OPEN
TAMPER LO,
NORMALLY CLOSED
CONTINUOUS
MONITORING
CONTINUOUS
MONITORING
CONTINUOUS
MONITORING
SAMPLED
MONITORING
CONTINUOUS
MONITORING
SAMPLED
MONITORING
VCC (VOUT)
VCC (VOUT)
VCC (VOUT)
TCM
X, TPMX



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