Temp 29°C

CO 0PPM

TIME xx:xx

Date xx/xx/xxxx

DISPLAY

Button

Button

Button

Button

KEYBOARD

GAS

SENSOR

D0

D1

TPL5000

D2

VDD

PGOOD

RSTn

WAKE

TCAL

GND

DONE

VIN

POWER MANAGEMENT

VOUT VBAT_OK

GND

Rp

100k

RST

µC

GPIO

GPIO

VDD

GPIO

GND

SCL

LMP91000

SDA

VOUT

VREF

GND

SDA

SCL

ADC

CE

RE

WE

MENB

CE

RE

WE

VDD

VOLTAGE

REFERENCE

GND

VOUT

VIN

Rp

100k

Rp

100k

Lithium

ion battery

-

+

GPIO

GPIO

GPIO

GPIO

TPL5000

SNAS628B – JULY 2013 – REVISED DECEMBER 2014

www.ti.com

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

In battery powered applications the design of the system is driven by low current consumption. The TPL5000 is

suitable in the applications where there is the needs to monitor environment conditions at fixed timer interval.

Often in these applications the micro is kept on to enable the watchdog and to count the elapsed time. Some

time due to the high frequency clock of the micro controllers special structure needs to be configured to count for

long time (several seconds). The TPL5000 can do the same job burning only tens of nA.

9.2 Typical Application

The TPL5000 can be used in conjunction with environment sensors to build a low-power environment data-

logger, such as an air quality data-logger. In this application due to the monitored phenomena the micro-

controller and the front end of the sensor spend most of the time in idle state, waiting for the next working

interval, usually few hundred of ms. The application is based on a micro-controller which represents the core of

the data-logger, a front end for gas sensor, such as the LMP91000.

Figure 8. Data-logger

9.2.1 Design Requirements

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

ranges between 1 s to 10 s. The highest necessity it the maximization of the battery life. The TPL5000 helps

achieve that goal because it allows putting the micro-controller in its lowest power mode.

12

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