Texas Instruments TMP116METER-EVM Manuel utilisateur

SNOU160–April 2018

TMP116METER-EVM User's Guide

User's Guide

SNOU160–April 2018

TMP116METER-EVM User's Guide

The TMP116METER-EVM provides the user with an easy-to-read LCD screen while using the TMP116 for

measurement of ambient air temperature. The EVM measures 1.83 in × 1.45 in, so the system is fitted to

a small form factor for further convenience in space-constrained environments. The onboard

microcontroller (MCU) communicates with the temperature sensor using I2C communication protocol and

displays the measurement onto an LCD through SPI protocol.

Contents

1 Introduction ................................................................................................................... 1

2 Setup and Test Results..................................................................................................... 4

3 Schematic and Bill of Materials ............................................................................................ 6

List of Figures

1 TMP116METER-EVM Front View ........................................................................................ 2

2 TMP116METER-EVM Back View ......................................................................................... 2

3 Software Flow Chart ........................................................................................................ 5

4 System Current Consumption.............................................................................................. 6

5 TMP116METER-EVM Schematic ......................................................................................... 7

Trademarks

All trademarks are the property of their respective owners.

1 Introduction

The TMP116METER-EVM comes pre-loaded with firmware that ensures successful operation upon

connection of the coin cell battery. Because the MCU is flashed using JTAG protocol, the test, reset, and

ground pins are broken out to a three-pin header for the user to have the option to flash the

MSP430FR5969 MCU. The device features three push-buttons: Button S1 functions to perform RESET,

S2 switches the temperature display format on the display (Celsius or Fahrenheit), and another button

(S3) can be programmed by the user. Test points are provided for the user to probe the clock and data

signal lines corresponding to I2C data transfer in addition to power and ground probe locations.

Introduction

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Figure 1. TMP116METER-EVM Front View

Figure 2. TMP116METER-EVM Back View

1.1 Features

Low-power, high-accuracy temperature sensor: The TMP116 offers 16-bit resolution with an accuracy of

±0.2ºC (from -10ºC to +85ºC).

Ultra-low-power MCU: The MSP430FR5969 can operate from 1.8V to 3.6V while consuming 0.4 µA in

standby and 0.02 µA in shutdown.

Coin Cell Operation: CR2032 supplies 3V with a nominal capacity of 225 mAh

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Introduction

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TMP116METER-EVM User's Guide

1.1.1 TMP116 Temperature Sensor

The TMP116 sensor measures the ambient air temperature with high precision and low power

consumption. This device provides a 16-bit temperature result with a resolution of 0.0078°C without

calibration. The TMP116 units are 100% tested on a production setup that is NIST traceable and verified

with equipment calibrated to ISO and IEC 17025 accredited standards. The sensor comes in a WSON

(2.00 mm × 2.00 mm) package and consumes minimal current that, in addition to providing power savings,

minimizes self-heating and improves measurement accuracy. The TMP116 operates from 1.9 V to 5.5 V

and typically consumes 3.5 µA.

1.1.2 MSP430FR5969 Mixed-Signal Microcontroller

The MSP430FR5969 is an ultra-low-power MCU that is optimized for lowered energy budgets in end

equipment.

The device is a member of the MSP430FR59xx family of ultra-low-power mixed-signal MCUs featuring

generous FRAM capabilities to enhance low-power designs in addition to intelligent peripherals to allow for

varied application implementation. Updating FRAM takes 100× less time than DRAM, and there is no pre-

erase required. In addition, FRAM includes faster write speeds, unified memory, and low-energy writes.

Unified memory refers to program, data, and storage registers in one single place, which expedites the

software run. Because of its fast write speeds, FRAM has near infinite endurance. In a remote sensor,

data could be written more often for improved data accuracy, or it could collect data for longer. Due to the

lack of a charge pump, FRAM enables lower average and peak power during writes. FRAM is also

nonvolatile (that is, retains its contents upon power loss). Using the MSP430 MCU with FRAM allows for

on-the-fly writes, as opposed to buffered in RAM. The bitwise programmable memory can be used at the

programmer’s convenience for data or program storage. FRAM also offers advantages in security and is

inherently more secure due to its makeup. Also, de-layering is not effective. In comparison to MCUs with

flash, FRAM:

• Is very easy to use

• Requires no setup or preparation such as unlocking of control registers

• Is not segmented and each bit is individually erasable, writable, and addressable

• Does not require an erase before a write

• Allows low-power write accesses (does not require a charge pump)

• Can be written to across the full voltage range (1.8 V to 3.6 V)

• Can be written to at speeds close to 8MBps (maximum flash write speed including the erase time is

approximately 14 kBps)

• Does not require additional power to write to FRAM when compared to reading from FRAM

1.2 Applications

The primary application of this EVM is to showcase a low power solution for temperature monitoring by

utilizing low power-consumption devices.

A battery voltage monitoring system allows the user to implement in firmware. A potential divider serves to

feed an ADC-enabled GPIO of the MSP430 MCU. That way, voltage sags intrinsic to battery operation

over time can be monitored and optionally displayed along with temperature measurement results;

however, this requires firmware modification. VCCMonitor is calculated as follows:

(1)

Select R4 and R5 to provide appropriate drive current to the ADC. In addition, the system features a

reverse polarity protection FET applied to the battery terminals. This FET acts as a load switch in the

system. Looking at the schematic, the body diode of Q1 sits connected between the drain and source of

Q1. The anode is connected to the drain, while the cathode is connected to the gate. When the battery is

connected correctly, the body diode is forward biased and conducts current from the drain to the source.

Because Q1 is a P-channel MOSFET, the gate voltage is brought below the source voltage, providing the

correct turnon condition. When the battery is connected in reverse, the gate of Q1 is receiving a voltage

above the source voltage. Therefore, Q1 does not turn on and current is not passed to the load through

conduction of the body diode.

Setup and Test Results

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2 Setup and Test Results

2.1 Hardware

CAUTION

The TMP116METER-EVM requires a Panasonic CR2032 coin cell battery

which is not included.

NOTE: The TMP116METER-EVM requires a Panasonic CR2032 coin cell battery which is not included.

The TMP116METER-EVM includes:

• MSP430FR5969 MCU

• Three push-button switches

• TMP116 temperature sensor

• LSO13B7DH03 LCD

• 32-kHz FC-135 32.7680KA-A3 crystal

• Associated discrete components

• For a comprehensive list of all parts, see the Bill of Materials (BOM).

2.2 Software

This TMP116METER-EVM ships pre-loaded with software for its MSP430FR5969 MCU. When the battery

is loaded, the display shows a Texas Instruments splash screen and then proceeds to display the current

temperature and humidity. The rest of this section details the operation of the software.

Included with this reference design is a software package that contains a Code Composer Studio (CCS)

project designed for the MSP430FR5969 mCU. For proper evaluation, import the CCS project into CCS

v7.3 or later with TI Compiler v16.9.4.LTS or later.

After reset or power-on, several hardware initializations take place. All GPIO pins are configured as

outputs and driven to logic low to save power. The pins that are used are then reconfigured for their

intended purpose. The MSP430 MCU’s internal oscillator, known as DCO, is configured for 8 MHz and

connected to the internal signals SMCLK and MCLK. The external 32-kHz real-time crystal (RTC) is

connected to the low-frequency clock inputs (LFXT), so the LFXT is configured as the source of the

internal signal ACLK (Aux Clock). TIMER A is configured as a counter with ACLK as source. Conveniently,

a count of 32768 (215) is equivalent to 1 second, a count of 16384 (214) is equivalent to a half second,

and so on. The eUSCI B0 peripheral is configured for I2C communication with the TMP116 device. Finally,

the eUSCI A1 peripheral is configured for SPI use with the display, and the Sharp display is initialized.

The next step in the software is to begin the loop.

On each iteration, the MSP430 MCU begins by checking the state of the button S1 and setting the Celsius

and Fahrenheit variable. An I2C Write transaction is then performed to instruct the TMP116 to begin a

temperature measurement. This measurement takes a few milliseconds (for conversion time, see

TMP116x High-Accuracy, Low-Power, Digital Temperature Sensor With SMBus- and I2C-Compatible

Interface ), so the MSP430 MCU is configured for LPM4 during the down time. After TIMER A interrupts

and resumes, the temperature data is retrieved from the TMP116. The values for temperature are

converted to characters using the tmp-decode.c library. This library is designed to provide string

conversion without loss of 16-bit precision, but it can be adjusted for less precision. Finally, the

temperature string updates the display and the MSP430 MCU returns to LPM4 for 2 seconds before

looping.

Reset / Power Up

Toggle Celsius/

Fahrenheit

Check

button

Setup MCU pins, clocks,

Timer A, I2C

Initialize Graphics Library

(GRLIB) and Sharp Display

Pressed

Trigger

Measurement

Sleep (LPM4) during

measurement

Retrieve

Temperature Result

Update Screen

Sleep (LPM4) for

2 seconds

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Setup and Test Results

SNOU160–April 2018

TMP116METER-EVM User's Guide

2.3 Programming

The TMP116 meter can be flashed or debugged using the Spy-By-Wire (SBW) interface. The

MSP430FR5969’s SBW interface is available at header J1 pins TEST and RST. Connect these pins, and

GND/VCC as appropriate, to an MSP430 or a standalone debugger such as MSP-FET. For more

information, see MSP Debuggers .

Figure 3. Software Flow Chart

2.3.1 System Current Consumption

Although the current consumption of the system in its inactive mode is clearly defined by summing each

inactive mode current specification in device data sheets, it is not so clear when the devices are active.

Therefore, this test is set up to measure the current consumption of the system in active mode. The

measurement is taken using a small series resistor connected to a simple instrumentation amplifier to

perform a differential measurement across the resistor. This arrangement is used because the standard

probes of an oscilloscope can only take single-ended measurements.

The below image yields the current consumption of the system while it is in its active mode.

Schematic and Bill of Materials

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Figure 4. System Current Consumption

Because the gain of the instrumentation amplifier is programmed to 1000, the 1.65-V measurement

highlighted by cursor B corresponds to 1.02 mA consumed by the system. The transactions taking place

during the system’s active mode cycle are:

• MSP430 MCU wakes up due to interrupt by Timer A.

• MSP430 MCU communicates with the TMP116 through I2C.

• MSP430 MCU decodes information provided by TMP116.

• MSP430 MCU communicates with the LCD through SPI to update the display.

These transactions are reflected in the oscilloscope capture whenever the voltage signal steps up. After

these transactions take place, the MSP430 MCU returns to standby mode (LPM4), the TMP116 sensor

returns to sleep mode, and the LCD returns to its low power consumption mode. During the active mode

transactions, the system consumes between 0.2 mA to 1.02 mA. Because the active mode cycle is

occurring about every 2 seconds, this active mode occurs 1800 times per hour. The active mode

transactions each take about 100 ms to perform, so for 6.65% of an hour, the system is in active mode.

The blue arrow indicates the system current consumption in LPM4 (shutdown). Shutdown current

consumption includes the MSP430 MCU, TMP116, and LCD in shutdown modes. A typical system

shutdown current consumption is about 130 µA. The below equation yields an estimate for the expected

battery life of the CR2032:

(2)

3 Schematic and Bill of Materials

To download the full design package, see the TI Design Guide.

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Schematic and Bill of Materials

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3.1 Schematic

Figure 5. TMP116METER-EVM Schematic

Schematic and Bill of Materials

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3.2 Bill of Materials

Designator Qty Value Description Package Reference Part Number Manufacturer

!PCB1 1 Printed Circuit Board SENS021 Any

BT1 1 Battery Holder for CR2032, SMT Battery Holder for

CR2032, SMT BK-912 Memory Protection

Devices

C1 1 0.1uF CAP, CERM, 0.1 uF, 16 V, +/- 10%, X5R,

0201 0201 GRM033R61C104KE84D MuRata

C2, C4, C7 3 0.1uF CAP, CERM, 0.1 uF, 10 V, +/- 10%, X5R,

0402 0402 GRM155R61A104KA01D MuRata

C3, C5 2 1uF CAP, CERM, 1 uF, 6.3 V, +/- 10%, X5R, 0402 0402 GRM155R60J105KE19D MuRata

C6 1 2200pF CAP, CERM, 2200 pF, 6.3 V, +/- 10%, X5R,

0402 0402 GRM155R60J222KA01D MuRata

C9, C10 2 12pF CAP, CERM, 12 pF, 50 V, +/- 5%, C0G/NP0,

0201 0201 GRM0335C1H120JA01D MuRata

DS1 1 LCD Display Dot Pixels 128x128 LCD Display Dot Pixels

128x128 LS013B7DH03 Sharp Microelectronics

H1, H2, H3, H4 4 Bumpon, Cylindrical, 0.312 X 0.200, Black Black Bumpon SJ61A1 3M

J2 1 Connector, FPC 10 Pos. 9.1x2.0x5.6 mm Connector PFC,

9.1x2.0x5.6mm FH12-10S-0.5SH(55) Hirose Electric Co. Ltd.

Q1 1 -20V MOSFET, P-CH, -20 V, -3.7 A, SOT-23 SOT-23 SI2323DS Vishay-Siliconix

R1, R2 2 10k RES, 10 k, 5%, 0.063 W, 0402 0402 CRCW040210K0JNED Vishay-Dale

R3 1 33k RES, 33 k, 5%, 0.063 W, 0402 0402 CRCW040233K0JNED Vishay-Dale

RST, S1, S2 3 Switch, SPST-NO, 1 Pos, 0.05A, 12VDC, SMD 7.8x3.5mm TL3330AF260QG E-Switch

TP1, TP2, TP3, TP4 4 Natural PC Test Point Brass, SMT Natural PC Test Point

Brass, SMT S2761-46R Harwin

U1 1 High-Accuracy, Low-Power, Digital

Temperature Sensor with SMBus and Two-

Wire Serial Interface, DRV0006A (WSON-6)

DRV0006A TMP116AIDRVR Texas Instruments

U2 1 MSP430FR5969 16 MHz Ultra-Low-Power

Microcontroller featuring 64 KB FRAM, 2 KB

SRAM, 40 IO, RGZ0048B (VQFN-48)

RGZ0048B MSP430FR5969IRGZR Texas Instruments

Y1 1 CRYSTAL, 32.768KHz, 12.5PF, SMD 3.2x0.9x1.5mm ABS07-32.768KHZ-T Abracon Corporation

C8 0 0.1uF CAP, CERM, 0.1 uF, 10 V, +/- 10%, X5R,

0402 0402 GRM155R61A104KA01D MuRata

J1 0 Header, 2.54 mm, 4x1, Gold, TH Header, 2.54 mm, 4x1,

TH PBC04SAAN Sullins Connector

Solutions

R4, R5 0 2.00Meg RES, 2.00 M, 1%, 0.063 W, 0402 0402 CRCW04022M00FKED Vishay-Dale

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Schematic and Bill of Materials

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