- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄69016 > M41ST87WMX6 (STMICROELECTRONICS) 1 TIMER(S), REAL TIME CLOCK, PDSO28 PDF資料下載
參數(shù)資料
| 型號(hào)： | M41ST87WMX6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封裝： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOX-28 |
| 文件頁數(shù)： | 19/52頁 |
| 文件大?。?/td> | 689K |
| 代理商： | M41ST87WMX6 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁當(dāng)前第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁
Operating modes
M41ST87Y, M41ST87W
Doc ID 9497 Rev 8
2.7
Tamper detection operation
The tamper pins are triggered based on the state of an external switch. Two switch mode
options are available, normally open or normally closed, based on the setting of the 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 (TBx) 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 24 on
page 34), a reset of the TIE bit to '0,' or the RST output is asserted.
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.' Thus, when servicing a tamper interrupt, the user should read the flags
register to clear the IRQ pin, then clear the TEBx bit to clear the TBx flag, followed by setting
TEBx to again enable the tamper circuit.
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 tamper flag bit(s) 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 23). When enabled, the sampling frequency is once per second (1Hz), for a duration of
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| M41ST87YMX6 | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M41ST87YMX6TR | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M41ST87WMX6TR | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M41ST95WMX6 | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M41ST95YMH6E | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M41ST87WMX6F | 制造商:STMICROELECTRONICS 制造商全稱: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 |
| M41ST87WMX6TR | 功能描述:實(shí)時(shí)時(shí)鐘 Serial 1280 (160x8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M41ST87WSS6 | 制造商:STMICROELECTRONICS 制造商全稱: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 |
| M41ST87WSS6F | 功能描述:實(shí)時(shí)時(shí)鐘 128 NVRAM Serial RTC 3.0 to 3.6 Vcc RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M41ST87Y | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0, 3.3, or 3.0V, 1280 bit (160 x8) Secure Serial RTC and NVRAM Supervisor with Tamper Detection |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。