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參數(shù)資料
| 型號： | TPS3103E15MDBVREP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | PLASTIC, SOT-23, 6 PIN |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 502K |
| 代理商： | TPS3103E15MDBVREP |
www.ti.com
Watchdog
Manual Reset (MR)
PFI, PFO
SENSE
TPS3103H20
PFI
GND
R1
R2
MSP430
RESET
GND
Analog
Circuit
Px.x
Py.x
(1)Resistormaybeintegratedin
m
C.
RESET
PFO
V
DD
V
DD
Low-Power mC
2V
-2V
MR
(1)
V
=0.551V
(NEG_TH)
-
R2
R1
(V
0.551V)
DD
-
Production Data
TPS3106xxx-EP
TPS3110xxx-EP
SLVS686 – OCTOBER 2006
APPLICATION INFORMATION (continued)
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 (tD). This event also reinitializes the watchdog timer.
Many
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 (tD) after MR
returns high. The input has an internal 100-k
pullup resistor, so it can be left open if it is unused.
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-
F capacitor from MR to GND provides additional noise immunity.
The TPS3103 has an integrated power-fail input (PFI) comparator with a separate open-drain power-fail output
(PFO). 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.
An additional comparator is provided to monitor voltages other than the nominal supply voltage. The PFI is
compared with an internal voltage reference of 0.551 V. If the input voltage falls below the power-fail threshold
(VIT – (S)), the 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 ensure 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 (VDD) must be higher than 0.8 V.
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 (VIT–(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 VDD 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.
Figure 12. TPS3103 Monitoring a Negative Voltage
15
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