TMP7 ABCIRCUITS | Alldatasheet

Document overview

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  • PDF pages: 10

Technical content

Features

  • Degrees C, Degrees F, percentage and raw data outputs.
  • Can drive seven segment displays and serial devices.
  • Minimum and maximum temperatures.
  • Percentage scale.
  • 12 bit A/D converter
  • Few external parts required.
  • Low power consumption 20 mA typical.
  • Supply voltage 3.3 to 5.25 volts.
  • All timing internally generated.
  • On chip input resistors.
  • Output polarity select .
  • TTL and CMOS compatible.
  • Part is in full production.
  • SOIC and DIP 28 Pin Package.
  • ROHS Compliant
  • Low EMI

Applications

  • Temperature displays.
  • Remote temperature sensing.
  • Remote 12 bit A/D converter.
  • Environmental and process controls.
  • Percentage displays.

Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 Part Number TMP7 Copyright © 2014 ABCircuits. Revised September 2014 Page 2 of 10 Example Circuit – Stand Alone Thermometer B C G G C B COM VCC 10K TMP7 SEGRA NC SEGRC SEGRE SEGRG NC MIN- SEGLF SEGLD SEGLB SEG3G SEGRF SEGRB VSS SEGLE SEGRD SEGLA SEGLG VDD SEGLC MAX- FARH SEG3B SEG3C TEMP SOUT- SCALE POL VCC RIGHT COMMON ANODE DISPLAY MAX OPTIONAL 3RD COMMON ANODE DISPLAY MIN t 10K NTC LEFT COMMON ANODE DISPLAY F/C OPTIONAL SWITCHES A B C D E F G G F E D C B A COM VCC VCC VCC A B C D E F G G F E D C B A COM Example Circuit – Ethernet Thermometer +3.3 t 10K NTC TMP7 5 24 SEGRA NC SEGRC SEGRE SEGRG NC MIN- SEGLF SEGLD SEGLB SEG3G SEGRF SEGRB VSS SEGLE SEGRD SEGLA SEGLG VDD SEGLC MAX- FARH SEG3B SEG3C TEMP SOUT- SCALE POL ETHERNET LANTRONIX XPORT GND +3.3 -POR OUT IN CP1 CP2 CP3 +3.3+3.3 10K

Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 Part Number TMP7 Copyright © 2014 ABCircuits. Revised September 2014 Page 3 of 10 Example Circuit – USB Thermometer TMP7 5 24 SEGRA NC SEGRC SEGRE SEGRG NC MIN- SEGLF SEGLD SEGLB SEG3G SEGRF SEGRB VSS SEGLE SEGRD SEGLA SEGLG VDD SEGLC MAX- FARH SEG3B SEG3C TEMP SOUT- SCALE POL 10K VCC t 10K NTC 4.7.01 REFER TO FT232 DATASHEET FOR MORE DETAILS CASE USB VCC BEAD VCC FT232-SSOP GND GND CBUS3 CBUS2 CBUS1 CBUS0 -CTS DTR RXD TXD -RST USBM USBP VCC VCCIO 3VOUT GND AGND NC NC TEST OSCI OSCO RTS RI DSR DCD CBUS4 Example Circuit – RS-232 Thermometer VCC t 10K NTC RXD VCC GND 10K TMP7 5 24 SEGRA NC SEGRC SEGRE SEGRG NC MIN- SEGLF SEGLD SEGLB SEG3G SEGRF SEGRB VSS SEGLE SEGRD SEGLA SEGLG VDD SEGLC MAX- FARH SEG3B SEG3C TEMP SOUT- SCALE POL.1 U2= MAX3232 FOR 3V RS232 RS232 U2= MAX232 FOR 5V RS232 DB9S TXD VCC VCC SEE NOTES 1615 11 14 10 7 12 13 9 8 C1+ C1- C2+ C2- VCCGND T1in T1out T2in T2out R1out R1in R2out R2in

Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 Part Number TMP7 Copyright © 2014 ABCircuits. Revised September 2014 Page 4 of 10 Example Circuit – Percentage Display VCC VCC RIGHT COMMON ANODE DISPLAY LEFT COMMON ANODE DISPLAYVCC B C G G C B COM OPTIONAL 3RD COMMON ANODE DISPLAY TMP7 SEGRA NC SEGRC SEGRE SEGRG NC MIN- SEGLF SEGLD SEGLB SEG3G SEGRF SEGRB VSS SEGLE SEGRD SEGLA SEGLG VDD SEGLC MAX- FARH SEG3B SEG3C TEMP SOUT- SCALE POL A B C D E F G G F E D C B A COM A B C D E F G G F E D C B A COM VCC VCC Connection Diagram TMP7 5 24 SEGRA NC SEGRC SEGRE SEGRG NC MIN- SEGLF SEGLD SEGLB SEG3G SEGRF SEGRB VSS SEGLE SEGRD SEGLA SEGLG VDD SEGLC MAX- FARH SEG3B SEG3C TEMP SOUT- SCALE POL

Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 Part Number TMP7 Copyright © 2014 ABCircuits. Revised September 2014 Page 5 of 10 Pin Description Pin # Description Pin # Description

1 FARH 28 VDD

2 SEG3B 27 POL

3 MIN- 26 SCALE

4 MAX- 25 SOUT-

5 SEG3C 24 TEMP

6 SEGLF 23 SEGLG

7 SEGLD 22 SEGLE

8 SEGLB 21 SEGLC

9 NC 20 SEGLA

10 SEG3G 19 NC

11 SEGRF 18 SEGRG

12 SEGRD 17 SEGRE

13 SEGRB 16 SEGRC

14 VSS 15 SEGRA

Polarity input. If this pin is open or high, the “on” segments will have a high level on the SEG outputs of the chip. If this pin is low or grounded “on” segments will output as a low on the SEG pins. This pin is read once at power u p and has a built in pull up resistor. TEMP This is the analog input for the temperature. A 10K precision resistor and a 10K NTC thermis ter are connected to this input for temperature measurement. The thermister should have a B25/B5 ratio of 3977K. Th ese thermisters are available from Murata, Vishay, US Sensor, and other companies. This input is a sensitive analog input and should be protected from noise. This input may also be connected to any analog device with an output of 0 to VCC volts. In this case, the input must be protected from voltages greate r than VCC or lower than ground. MIN- This optional input displays the lowest temperature since power was applied. If both MIN - and MAX- are low, the minimum temperature is reset to the current tempe rature. This input has a built in pull up resistor. This input has no effect on the serial output. MAX- This optional input displays the highest temperature since power was applied. If both MIN - and MAX- are low, the maximum temperature is reset to the current temperature. This input has a built in pull up resistor. This input has no effect on the serial output. SCALE and FARH These two inputs select the scale to be used, degrees C, degrees F, Percentage, or Raw data. These inputs have a built in pu ll up resistors. These inputs are read before every display update and serial output .

Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 Part Number TMP7 Copyright © 2014 ABCircuits. Revised September 2014 Page 6 of 10 SCALE FARH Output Open or high Open or high Degrees Fahrenheit Open or high Ground or low Degrees Celsius Ground or low Open or high Percentage (0-100) Ground or low Ground or low Raw analog count In the Celsius scale, the output ranges from – 40 to 150. In the Fahrenheit scale, the output ranges from -40 to 199. In the percentage mode, the output ranges from 0-100. (101 counts) A small resistor on the VCC side of the input potentiometer or a voltage divider may be used to drop the scale to 0 -99 so only 2 displays are necessary. In the raw analog mode, the seven segment display shows 00 -FF (8 bits hexadecimal) One count = VCC/256 volts. The serial output in r aw mode ranges from 000 -FFF (12 bits hexadecimal.) One count = VCC/4096 volts. SOUT- SOUT- is the serial output of the IC to optionally connect to your UART, a RS -232 driver, a USB IC or Ethernet. The IC outputs three ASCII formatted numbers, fo llowed by a carriage return. (0D hex) The output format is 9600 BPS, 8 bits 1 stop, no pari ty. Data is sent about every 250 mS. SEGRA, SEGRB, SEGRC, SEGRD, SEGRE, SEGRF, SEGRG SEGLA, SEGLB, SEGLC, SEGLD, SEGLE, SEGLF, SEGLG SEG3B, SEG3C, SEG3G SEG3 is the optio nal 100’s and minus display SEGR is the right hand of the two displays. SEGL is the left hand of the two displays If the POL pin is open or hi, this SEG outputs will be high when a segment is on. If the POL pin is low or grounded, the SEG outputs will be low when a segment is on. These are the seven segment outputs to each individual display An external driver or current limiting resistor is required for each segment. If you are using only a resistor, it must be sized to limit source current to 5 mA maximum per pin or sink current to 9 mA per pin. See also the segment table, and the ASCII to seven segment translation table. VSS Connect to system ground. VDD Connect to supply voltage of 3.3 to 5 volts. A .1 uF decoupling capacitor to ground is recommended. NOTES: Make no connection to the NC pins . Pins 9 and 19 must be left unconnected .

Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 Part Number TMP7 Copyright © 2014 ABCircuits. Revised September 2014 Page 7 of 10 Segment Identification Table Seven Segment Translation Table Protecting the TEMP Input From Voltages Outside 0-VCC INPUT VCC TO TEMP INPUT

Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 Part Number TMP7 Copyright © 2014 ABCircuits. Revised September 2014 Page 8 of 10 Using Drivers For Brighter Displays VCC VCC A B C D E F G G F E D C B A COM A B C D E F G G F E D C B A COM OPTIONAL 3RD COMMON ANODE DISPLAYULN2804 17IN2 IN3 IN4 IN5 IN6 IN7 IN8 COM OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 GND OUT2 RIGHT COMMON ANODE DISPLAY LEFT COMMON ANODE DISPLAY ULN2804 17IN2 IN3 IN4 IN5 IN6 IN7 IN8 COM OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 GND OUT2 VCC B C G G C B COM VCC t 10K NTC VCC VCC TMP7 SEGRA NC SEGRC SEGRE SEGRG NC MIN- SEGLF SEGLD SEGLB SEG3G SEGRF SEGRB VSS SEGLE SEGRD SEGLA SEGLG VDD SEGLC MAX- FARH SEG3B SEG3C TEMP SOUT- SCALE POL VCC 10K ULN2804 17IN2 IN3 IN4 IN5 IN6 IN7 IN8 COM OUT8 OUT7 OUT6 OUT5 OUT4 OUT3 GND OUT2 VCC Absolute Maximum Ratings Symbol Description Min Typical Max Units Notes Tstg Storage Temperature -55 25 +100 ºC Ta Operating Temperature -40 +85 ºC Vdd Vdd - Vss Voltage -0.5 +6.0 V Vio Input Voltage Vss - 0.5 Vdd +0.5 V Imio Maximum current into any pin -25 +50 mA ESD Electrostatic Discharge Voltage 2000 V Human Body Model ESD LU Latch up current 200 mA

Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 Part Number TMP7 Copyright © 2014 ABCircuits. Revised September 2014 Page 9 of 10 Symbol Description Min Typical Max Units Notes Vdd Supply Voltage 3.3 5.25 V Idd Supply Current 20 mA Note 1 Voh High Output Level Vdd - 1.0 V Note 2 Vol Low Output Voltage 0.75 V Note 3 Vih Input High Level 2.1 V Vil Input Low Level 0.8 V Ioh High Level Source Current 10 mA Note 2 Iol Low Level Sink Current 25 mA Note 3 Cio Capacitive load 3.5 10 pF Iil Input leakage 1 nA Rpu Pull Up Resistors On Inputs 4 5.6 8 k? Note 1: Vdd=5VDC, all inputs and outputs open Note 2 Ioh=10 mA max per pin, 80 mA maximum all pins combined Note 3 Iol=25 mA max per pin 150 mA maximum all pins combined Theory Of Operation The TMP7 IC is a custom programmed microprocessor designed t o monitor the analog voltage on the TEMP input with a 12 bit A/D . The input is read 16 times and averaged. The value read is converted to the desired scale and displayed on seven segment displays and sent to the serial output.

Turning Ideas Into Reality ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104 Part Number TMP7 Copyright © 2014 ABCircuits. Revised September 2014 Page 10 of 10 Physical Dimensions SOIC-28 Physical Dimensions 28 Pin Dip Package (-DIP Suffix) Close but not quite? Our products are software based, we can modify existing parts to fit your needs at a minimal cost or create new parts designed to your specifications. Email us and we can mak e a chip for you! For the latest version of this spec sheet, visit www.abcircuits.com Design Services Available We can quickly turn your idea into a chip, a pc board, or a finished product. Contact us with your needs and specifications.