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参数资料
| 型号： | M41ST87YMX6TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOX-28 |
| 文件页数： | 18/48页 |
| 文件大小： | 457K |
| 代理商： | M41ST87YMX6TR |
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M41ST87Y, M41ST87W
Operating modes
tamper connect mode bit (TCMX). If the selected switch mode is normally open (TCMX = '1'),
the tamper pin will be triggered by being connected to VSS (if the TPMX bit is set to '0') or to
VCC (if the TPMX bit is set to '1'), through the closing of the external switch. When the
external switch is closed, the tamper bit will be immediately set, allowing the user to
determine if the device has been physically tampered with. If the selected switch mode is
normally closed (TCMX = '0'), the tamper pin will be triggered by being pulled to VSS or to
VOUT (depending on the state of the TPMX bit), through an internal pull-up/pull-down resistor
as a result of opening the external switch.
When a tamper event occurs, the tamper bits (TB1 and/or TB2) will be immediately set if
TEBX = '1.'
If the tamper interrupt enable bit (TIEX) is set to a '1,' the IRQ/OUT pin will also be activated.
The IRQ/OUT output is cleared by a READ of the flags register (as seen in Figure 23 on
page 33), a reset of the TIE bit to '0,' or the RST output is enabled.
Note:
In order to avoid an inadvertent activation of the IRQ/OUT pin due to a prior tamper event,
the flag register (0Fh) should be read prior to resetting the TEBX bit.
The tamper bits are “read only” bits and are reset only by writing the tamper enable bit
(TEBX) to '0.'
The tamper detect function operates both under normal power, and in battery backup. Even
if the trigger event occurs during a power-down condition, the bit will be set correctly.
2.8
Sampling
As the switch mode normally closed (TCMX = '0') requires a greater amount of current to
maintain constant monitoring, the M41ST87Y/W offers a programmable tamper detect
page 22). When enabled, the sampling frequency is once per second (1Hz), for
approximately 1 ms.
When TEBX is disabled, no current will be drawn by the tamper detection circuit. After a
tamper event has been detected, no additional current will be drawn.
Note:
The oscillator must be running for tamper detection to operate in the sampling mode. If the
oscillator is stopped, the tamper detection circuit will revert to constant monitoring.
Note:
Sampling in the tamper high mode (TPMX = '1') may be bypassed while on VCC by
connecting the TPXIN pin to VCC through an external resistor. This will allow constant
2.9
Internal tamper pull-up/down current
Depending on the capacitive and resistive loading of the tamper pin input (TPXIN), the user
may require more or less current from the internal pull-up/down used when monitoring the
normally closed switch mode. The state of the tamper current hi/tamper current low bit
(TCHI/TCLOX) determines the sizing of the internal pull-up/-down. TCHI/TCLOX = '1' uses a
1 M
Ω pull-up/-down resistor, while TCHI/TCLOX = '0' uses a 10 MΩ pull-up/-down resistor
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相关代理商/技术参数 |
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| M41ST87YSS6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM |
| M41ST87YSS6F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM |
| M41ST95W | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor |
| M41ST95WMH6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor |
| M41ST95WMH6E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor |
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