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TPS3110E16DVB Datasheet(PDF) 9 Page - Texas Instruments

Part # TPS3110E16DVB
Description  ULTRALOW SUPPLY CURRENT/SUPPLY VOLTAGE SUPERVISORY CIRCUITS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS3110E16DVB Datasheet(HTML) 9 Page - Texas Instruments

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TPS31xxExx, TPS31xxH20, TPS31xxK33
ULTRALOW SUPPLY CURRENT/SUPPLY VOLTAGE SUPERVISORY CIRCUITS
SLVS363B − AUGUST 2001 − REVISED SEPTEMBER 2004
www.ti.com
9
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
PART
NO.
I/O
DESCRIPTION
GND
ALL
2
GND
MR
ALL
3
I
Manual-reset input. Pull low to force a reset. RESET remains low as long as MR is low
and for the timeout period after MR goes high. Leave unconnected or connect to VDD
when unused.
PFI
TPS3103
4
I
Power-fail input compares to 0.551 V with no additional delay. Connect to VDD if not used.
PFO
TPS3103
5
O
Power-fail output. Goes high when voltage at PFI rises above 0.551 V.
RESET
TPS3103
TPS3110
1
O
Active-low reset output. Either push-pull or open-drain output stage
RSTSENSE
TPS3106
5
O
Active-low reset output. Logic level at RSTSENSE only depends on the voltage at
SENSE and the status of MR.
RSTVDD
TPS3106
1
O
Active-low reset output. Logic level at RSTVDD only depends on the voltage at VDD and
the status of MR.
SENSE
TPS3106
TPS3110
4
4
I
A reset will be asserted if the voltage at SENSE is lower than 0.551 V. Connect to VDD if
unused
VDD
ALL
6
Supply voltage. Powers the device and monitors its own voltage
VDD
ALL
6
Supply voltage. Powers the device and monitors its own voltage
WDI
TPS3110
5
I
Watchdog timer input. If WDI remains high or low longer than the time-out period, then
reset is triggered. The timer clears when reset is asserted or when WDI sees a rising
edge or a falling edge.
detailed description
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 (td). This event also reinitializes the watchdog timer.
manual reset (MR)
Many
µC-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
Ω pull-up 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-
µF capacitor from MR to GND provides additional noise immunity.
PFI, PFO
The TPS3103 has an integrated power-fail (PFI) comparator with a separate open drain (PFO) output 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 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 (VIT−(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
Ω, 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 (VDD) must be higher than 0.8 V.


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