Texas Instruments AFE4110 Bedienungsanleitung

User's Guide

SLAU417–December 2011

AFE4110 Thermometer Demonstration Board

This user’s guide provides a general description of the AFE4110 thermometer demonstration board

(demo-pen). Use this document with the AFE4110 data sheet to get a broader understanding of the

functions and applications of this device.

Contents

1 Hardware Description ...................................................................................................... 1

2 Getting Started .............................................................................................................. 3

2.1 Inserting Battery and Reading the LCD Display ............................................................... 3

2.2 Board Jumper Configuration ...................................................................................... 4

3 Electrical Characteristics ................................................................................................... 4

4 Schematics and Layout .................................................................................................... 4

4.1 Schematics .......................................................................................................... 4

4.2 Layouts .............................................................................................................. 5

5 Bill of Materials .............................................................................................................. 6

List of Figures

1 AFE4110 Thermometer Demonstration Board Front (Bottom Layer) and Back (Top Layer) ..................... 2

2 Firmware Flowchart......................................................................................................... 3

3 Inserting Battery Into Holder............................................................................................... 4

4 Measured Temperature Accuracy vs Temperature..................................................................... 4

5 Top Layer Copper........................................................................................................... 5

6 Bottom Layer Copper....................................................................................................... 5

7 Silk Screen Top ............................................................................................................. 5

8 Silk Screen Bottom ......................................................................................................... 5

List of Tables

1 Description of Main Board Components ................................................................................. 2

2 Bill of Materials.............................................................................................................. 6

1 Hardware Description

Figure 1 shows the front and back sides of the thermometer. The board demonstrates an accurate,

low-cost, single-chip temperature measurement solution based on the AFE4110. This device is a

general-purpose, low-cost, 1.5-V microcontroller optimized for this application with features like an internal

1.85-V/3.3-V charge-pump for LCD/GPIO interface, buzzer driver, low-power sleep mode, etc. See the

AFE4110 data sheet (SLLSE48) for further details.

The measurement is done using an external thermistor with a negative temperature coefficient (NTC)

characteristic (resistance decreases with increasing temperature). The thermistor response has been

calibrated using two temperature points (at 31°C and 43°C), for an overall typical accuracy of ±0.1°C over

that range, when measured in a calibration bath. The system has not been designed to measure human

body temperature and must not be used for health diagnosis purposes.

SLAU417–December 2011 AFE4110 Thermometer Demonstration Board

Thermistor

Battery

Holder

LCD Push button switch

Piezo

buzzer

AFE4110 EEPROM

JTAG header

Extra power and ground header

Hardware Description

www.ti.com

Figure 1. AFE4110 Thermometer Demonstration Board Front (Bottom Layer) and Back (Top Layer)

As the AFE4110 lacks any nonvolatile memory to store code or data (unless is burnt permanently into its

ROM), the board actually uses the AFE4110 RAM-based (15 KB) emulation version and loads, at boot

time, the thermometer application code (~3 KB long) from an external 128k-bit SPI EEPROM. Notice that

in the final application, the EEPROM is not needed if the code is burnt into the ROM version of the

AFE4110. Furthermore, the device displays the temperature, in Celsius, with 0.1°C resolution, using a

5-digit LCD display. The solution also includes a piezo-based buzzer, along with a JTAG interface for

programming or debugging (Table 1 presents a list of key components).

Finally, the kit comes with a 1.5-V button-cell battery (SR60 standard) with a typical capacity of 20 mAh,

under standard operating conditions.

Table 1. Description of Main Board Components

Component Description

Thermistor Murata NCP15WB473J03RC. NTC thermistor, 47 kΩ ± 5% and a B-constant tolerance of ±1%. This

implementation demonstrates a cost-effective solution by complementing the use of a relaxed tolerance

thermistor with a 2-point calibration.

EEPROM 128k-bit SPI EEPROM. When a battery is inserted into the holder, the code is loaded from the

EEPROM into the AFE4110 internal RAM, and the AFE4110 proceeds to measure the resistance of the

thermistor. Notice that in the final application, the EEPROM is not needed if the code is burnt into the

ROM version of the AFE4110.

Piezo-Buzzer The buzzer is used to indicate the end of the temperature display. Following this, the AFE4110 goes

into LPM5 (sleep) mode.

Power-Supply/Ground Onboard connectors for 1.5-V external power supply and ground. Can be used instead of battery.

Header

LCD The AFE4110 has an internal charge pump to provide constant 3.3-V supply operation to the LCD, for

constant contrast even when battery voltage drops.

Push-Button Switch This switch is used to bring the AFE4110 out of the LPM5 mode. See Section 2 for the sequence of

events.

JTAG Header Provided for programming/debugging purposes.

Battery Holder 1.5-V button cell holder.

2AFE4110 Thermometer Demonstration Board SLAU417–December 2011

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Insert

battery

Code Loaded from

EEPROM

Thermistor

resistance measured

Temperature displayed

after each readout interval

Readout time completed,

beep, switch to LPM5

(sleep)

Push-

button

pressed?

Device in Sleep

Mode

YES

www.ti.com

Getting Started

2 Getting Started

After inserting the battery in the battery holder, the temperature is displayed in the LCD. Several readings

are displayed during the next 45 seconds. After the final temperature readout, the device beeps and goes

into LPM5 (sleep) mode. After that, the user needs to press and hold the push-button switch for

approximately 4 seconds to activate the sequence once again.

Figure 2. Firmware Flowchart

2.1 Inserting Battery and Reading the LCD Display

The battery must be inserted into the battery holder as shown in Figure 3, with the positive side of the

battery on top. Once this is done, the LCD displays the Firmware Version and the Hardware version,

followed by the temperature display.

SLAU417–December 2011 AFE4110 Thermometer Demonstration Board

Electrical Characteristics

www.ti.com

Figure 3. Inserting Battery Into Holder

2.2 Board Jumper Configuration

Power to the VDDIO pin of the AFE4110 and to the JTAG interface can be supplied from either the charge

pump CP18CAP (1.8 ×VBAT) or from the JTAG_VCCO. This is controlled by the SW1 switch on the

demonstration board. By default, the switch SW1 is in the USE position (See Section 4.1 for schematics

and Figure 7 and Figure 8 for the top and bottom silk screen views, respectively). In this configuration, the

AFE4110 VDDIO is powered from CP18CAP (1.8-V charge pump). For programming/debugging purposes,

the AFE4110 VDDIO must be powered from the JTAG_VCCO by sliding the switch SW1 to pin #1

position.

3 Electrical Characteristics

Figure 4 displays the typical resulting accuracy of the demo-pen after 2-point calibration at 31°C and 43°C.

Figure 4. Measured Temperature Accuracy vs Temperature

4 Schematics and Layout

4.1 Schematics

The schematics are located at the end of this document.

4AFE4110 Thermometer Demonstration Board SLAU417–December 2011

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Schematics and Layout

4.2 Layouts

Figure 5. Top Layer Copper

Figure 6. Bottom Layer Copper

Figure 7. Silk Screen Top

Figure 8. Silk Screen Bottom

SLAU417–December 2011 AFE4110 Thermometer Demonstration Board

Bill of Materials

www.ti.com

5 Bill of Materials

Table 2. Bill of Materials

QTY MFG MFG PART NO. REF DES DESCRIPTION

1 KEYSTONE 2998 BC2 BATT HOLDER,THU,3P

1 MEMORY PROTECT DEVICES BHX1-LR44-SM BC1 (DNI) BATT HOLDER,THU,3P

2 MURATA PKLCS1212E4001-R1 SP1 (DNI), SP2 BUZZER,SMT

5 AVX 0402YC104KAT2A C7, C12, C20, C27, C29 CAP,SMT,0402

1 TDK C1005C0G1E102J C28 CAP,SMT,0402

2 SAMSUNG CL05A475MQ5NRNC C15, C16 CAP,SMT,0402

2 PANASONIC ECJ-0EB1H102K C21, C22 CAP,SMT,0402

2 PANASONIC ECJ-1VB0J106M C11, C30 CAP,SMT,0603

2 HEADER,SMT,6P,.1CTRS JP2, JP3 CUSTOMER INSTALLED

1 SOFTBAUGH SBLCDA8 U3 DISPLAY,SMT,15P

1 COPAL ELECTRONICS CAS-120TA SW1 SWITCH, SLID, 3P

1 ST MICRO M95128-RMN6TP U2 IC,SMT,SOIC-8N

1 TI AFE4110 U1 MODULE

1 SUSUMU RG1005P-303-B-T5 R10 RES,SMT,0402

1 MURATA NCP15WB473J03RC R13 THERMISTOR,SMT,0402

1 PANASONIC ERJ-2RKF1004X R11 RES,SMT,0402

1 SUSUMU RG1005P-6492-B-T5 R8 RES,SMT,0402

1 SUSUMU RG1005N102B R16 RES,SMT,0402

1 PANASONIC EVQ-P2H02B SW2 SWITCH,SMT,2P

3 KEYSTONE ELECTRONICS 5001 TP1, TP2 (DNI), TP3 TESTPOINT,THU,1P

empty paragraph to eliminate blank page

6AFE4110 Thermometer Demonstration Board SLAU417–December 2011

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BuzzIn

BuzzOut

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