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參數(shù)資料
| 型號： | TPS3110XXX |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | UltraLow Supply-Current/Supply-Voltage Supervisory Circuits |
| 中文描述： | 超低Supply-Current/Supply-Voltage監(jiān)控電路 |
| 文件頁數(shù)： | 14/23頁 |
| 文件大?。?/td> | 517K |
| 代理商： | TPS3110XXX |
www.ti.com
WATCHDOG
The TPS3110 device integrates a watchdog timer that must be periodically triggered by a positive or negative
transition of WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval,
RESET becomes active for the time period (t
D
). This event also reinitializes the watchdog timer.
MANUAL RESET (MR)
Many
μ
C-based products require manual-reset capability, allowing an operator or logic circuitry to initiate a reset.
Logic low at MR asserts reset. Reset remains asserted while MR is low and for a time period (t
D
) after MR
returns high. The input has an internal 100-k
pull-up resistor, so it can be left open if it is unused.
PFI, PFO
The TPS3103 has an integrated power-fail (PFI) comparator with a separate open-drain (PFO) output. The PFI
and PFO can be used for low-battery detection, power-fail warning, or for monitoring a power supply other than
the main supply, and has no effect on RESET.
SENSE
The voltage at the SENSE input is compared with a reference voltage of 0.551 V. If the voltage at SENSE falls
below the sense-threshold (V
IT
(S)
), reset is asserted. On the TPS3106, a dedicated RSTSENSE output is
available. On the TPS3110, the logic signal from SENSE is OR-wired with the logic signal from V
DD
or MR. An
internal timer delays the return of the output to the inactive state, once the voltage at SENSE goes above 0.551
V plus about 15 mV of hysteresis. For proper operation of the SENSE-comparator, the supply voltage must be
higher than 0.8 V.
TPS3103xxx
TPS3106xxx
TPS3110xxx
SLVS363E–AUGUST 2001–REVISED SEPTEMBER 2007
Connect a normally open momentary switch from MR to GND to create a manual reset function. External
debounce is not required. If MR is driven from long cables or if the device is used in noisy environments,
connecting a 0.1-
μ
F capacitor from MR to GND provides additional noise immunity.
If there is a possibility of transient or DC conditions causing MR to rise above V
DD
, a diode should be used to
limit MR to a diode drop above V
DD
.
An additional comparator is provided to monitor voltages other than the nominal supply voltage. The power-fail
input (PFI) will be compared with an internal voltage reference of 0.551 V. If the input voltage falls below the
power-fail threshold (V
IT – (S)
), the power-fail output (PFO) goes low. If it goes above 0.551 V plus approximately
15-mV hysteresis, the output returns to high. By connecting two external resistors, it is possible to supervise any
voltage above 0.551 V. The sum of both resistors should be approximately 1 M
, to minimize power
consumption and to assure that the current into the PFI pin can be neglected, compared with the current through
the resistor network. The tolerance of the external resistors should be not more than 1% to ensure minimal
variation of sensed voltage. If the power-fail comparator is unused, connect PFI to GND and leave PFO
unconnected. For proper operation of the PFI-comparator, the supply voltage (V
DD
) must be higher than 0.8 V.
14
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Copyright 2001–2007, Texas Instruments Incorporated
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| TPS3123 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ULTRA-LOW VOLTAGE PROCESSOR SUPERVISORY CIRCUITS |
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| TPS3123G15DBVR | 功能描述:監(jiān)控電路 Ultra-Low Voltage Processor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| TPS3123G15DBVRG4 | 功能描述:監(jiān)控電路 Ultra-Low Voltage Processor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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