- 您现在的位置：买卖IC网 > PDF目录69016 > M41ST87YMX6TR (STMICROELECTRONICS) 1 TIMER(S), REAL TIME CLOCK, PDSO28 PDF资料下载
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： | 14/48页 |
| 文件大小： | 457K |
| 代理商： | M41ST87YMX6TR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页当前第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页
M41ST87Y, M41ST87W
Operating modes
2.6.6
Tamper detect sampling (TDS1 and TDS2)
This bit selects between a 1Hz sampling rate or constant monitoring of the tamper input
pin(s) to detect a tamper event when the normally closed switch mode is selected. This
allows the user to reduce the current drain when the TEBX bit is enabled while the device is
in battery backup (see Table 4 on page 22 and Figure 16 on page 22). Sampling is disabled
if the TCMX bit is set to logic '1' (Normally Open). In this case the state of the TDSX bit is a
“Don’t care.”
Note:
The crystal oscillator must be “on” for sampling to be enabled.
2.6.7
Tamper current high/tamper current low (TCHI/TCLO1 and
TCHI/TCLO2)
This bit selects the strength of the internal pull-up or pull-down used during the sampling of
the normally closed condition. The state of the TCHI/TCLOX bit is a “Don’t care” for normally
2.6.8
RAM clear (CLR1 and CLR2)
When either of these bits and the TEBX bit are set to a logic '1,' the internal 128 bytes of
user RAM (see Figure 14 on page 20) will be cleared to all zeros in the event of a tamper
condition. The 128 bytes of user RAM will be deselected (invalid data will be read) until the
corresponding TEBX bit is reset to '0.'
2.6.9
RAM clear external (CLR1EXT and CLR2EXT)
When either of these bits are set to a logic '1' and the TEBX bit is also set to logic '1,' the
external SRAM will be cleared and the RST output enabled (see Figure 14 on page 20 and
Note:
The reset output resulting from a tamper event will be the same as a reset resulting from a
power-down condition, a watchdog time-out, or a manual reset (RSTIN1 or RSTIN2).
This is accomplished by forcing TPCLR high, which if used to control the inhibit pin of the DC
of power to the VCC pin. VOUT will automatically be disconnected from the battery if the
tamper occurs during battery back-up (see Figure 18 on page 23). By inhibiting the DC
regulator, the user will also prevent other inputs from sourcing current to the external SRAM,
allowing it to retain data.
The user may optionally connect an inverting charge pump to the VCC pin of the external
SRAM (see Figure 19 on page 24). Depending on the process technology used for the
manufacturing of the external SRAM, clearing the memory may require varying durations of
negative potential on the VCC pin. This device configuration will allow the user to program
the time needed for their particular application. Control Bits CLRPW0 and CLRPW1
page 24).
Note:
When using the inverting charge pump, the user must also provide isolation in the form of
two additional small-signal power MOSFETs. These will isolate the VOUT pin from both the
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 TPCLR as shown in
Figure 19 on page 24. One n-channel enhancement MOSFET should be placed between
相关PDF资料 |
PDF描述 |
|---|---|
| M41ST87WMX6TR | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M41ST95WMX6 | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M41ST95YMH6E | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M41ST95YMH6 | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M41ST95YMX6 | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
发布紧急采购，3分钟左右您将得到回复。