TPS3106E09DBV

SENSE

GND

R1

R2

V

DD

RSTVDD

RSTSENSE

R3

2Cell

NiMH

ResetOutput

MR

TPS3103, TPS3106, TPS3110

www.ti.com

SLVS363F – AUGUST 2001 – REVISED NOVEMBER 2015

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The TPS310x and TPS311x families are supervisory circuits made to monitor the input supply and other external

voltages greater than 0.551 V. These devices are made to operate from and monitor input supplies ranging from

0.9 V to 3.3 V, and all versions have a manual reset pin. The TPS3103 and TPS3106 both have an active-low,

open-drain RESET output. The TPS3103 device has an integrated power-fail input (PFI) and corresponding

power-fail output (PFO) that can be used for low-battery detection or for monitoring a power supply other than

the input supply and has a short delay time for more immediate triggering of the output. The TPS3106 device has

a SENSE input with a corresponding output (RSTSENSE) for monitoring voltages other than the input supply and

a longer delay time than the TPS3103 device to minimize accidental triggering of the output. The TPS3110

device has an active-low push/pull RESET and a watchdog timer that is used for monitoring the operation of

microprocessors.

9.2 Typical Application

Figure 17. Battery Monitoring With 3-

μA Supply Current for Device and Resistor Divider

9.2.1 Design Requirements

In some applications it is necessary to minimize the quiescent current even during the reset period. This is

especially true when the voltage of a battery is supervised and the RESET is used to shut down the system or

for an early warning. In this case the reset condition will last for a longer period of time. The current drawn from

the battery should almost be zero, especially when the battery is discharged.

For this kind of application, either the TPS3103 or TPS3106 device is a good fit. To minimize current

The other output (RSTSENSE) is triggered from the voltage monitored at SENSE. In the application shown in

Figure 17, the TPS3106E09 device is used to monitor the input voltage of two NiCd or NiMH cells. The threshold

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