D0

D1

TPL5100

D2

VDD

PGOOD

DRV

TCAL

GND

DONE

CC2531

VDD

GPIO

SCL

HDC1000

SDA

GND

SDA

SCL

VDD

DC-DC BOOST

VOUT

Rp

100k

Rp

100k

Lithium

ion battery

-

+

GPIO

GND

VIN

ENB

GND

RF

TPL5100

www.ti.com

SNAS629C – JULY 2013 – REVISED DECEMBER 2014

8 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.

8.1 Application Information

In battery powered applications the design of the system is driven by low-current consumption. The TPL5100 is

suitable in the applications where there is the needs to monitor environment conditions in remote site at long

fixed timer interval. Occasionally in these applications the micro is kept on to enable the watchdog and count the

elapsed time. Often due to the high frequency clock of the microcontrollers, a special structure must be

configured to count for several seconds. The TPL5100 can mimic the same job, by completely turning off the

micro and sometimes the entire power channel; this results in burning only tens of nA.

8.2 Typical Application

The TPL5100 can be used in environment sensor nodes such as humidity and temperature sensor node. The

sensor node has to measure the humidity and the temperature and transmit the data through a low power RF

micro such as the CC2530. Since the temperature and the humidity in home application do not change so fast,

the measurement and the transmission of the data can be done at very low rate, such as every 30 seconds. The

RF micro should spend most of the time in counting the elapsed time, but using the TPL5100 it is possible to

complete turn off the RF micro and enlarge the battery life. The TPL5100 will turn on the RF micro when the

programmed timer interval elapses.

Figure 7. Sensor Node

8.2.1 Design Requirements

The design is driven by the low current consumption constraint. The data are usually acquired at a rate between

30 s to 60 s. The highest necessity is the maximization of the battery life. The TPL5100 helps achieve this goal

because it allows turning off the RF micro.

8.2.2 Detailed Design Procedure

When the focal constraint is the battery life, the selection of a low-power voltage regulator and low-leakage

MOSFET to power gate the microcontroller is mandatory. The first step in the design is the calculation of the

power consumption of each device in the different mode of operations. An example is the HDC1000, in

measurement mode the RF micro is in normal operation and transmission. The different modes offer the

possibility to select the appropriate timer interval which respect the application constraint and maximize the life of

the battery.

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