MAX1366ECM Maxim Integrated, MAX1366ECM Datasheet

MAX1366ECM

Manufacturer Part Number

MAX1366ECM

Description

LED Display Drivers

Manufacturer

Maxim Integrated

Datasheet

1.MAX1368ECM-T.pdf (36 pages)

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The MAX1366/MAX1368 low-power, 4.5- and 3.5-digit,

panel meters feature an integrated sigma-delta analog-

to-digital converter (ADC), LED display drivers, voltage

digital-to-analog converter (DAC), and a 4–20mA (or 0

to 16mA) current driver.

The MAX1366/MAX1368’s analog input voltage range is

programmable to either ±2V or ±200mV. The MAX1368

drives a 3.5-digit (±1999 count) display and the

MAX1366 drives a 4.5-digit (±19,999 count) display.

The ADC output directly drives the LED display as well

as the voltage DAC, which, in turn, drives the 4–20mA

(or 0 to 16mA) current-loop output.

In normal operation, the 0 to 16mA/4–20mA current-

loop output follows the ±2V or ±200mV analog input to

drive remote panel-meter displays, data loggers, and

other industrial controllers. For added flexibility, the

MAX1366/MAX1368 allow direct access to the ADC

result, DAC output, and the V/I converter input.

The sigma-delta ADC does not require external preci-

sion integrating capacitors, autozero capacitors, crystal

oscillators, charge pumps, or other circuitry commonly

required in dual-slope ADC panel-meter circuits. On-

chip analog input and reference buffers allow direct

interface with high-impedance signal sources. Excellent

common-mode rejection and digital filtering provides

greater than 100dB rejection of simultaneous 50Hz and

60Hz line noise. Other features include data hold and

peak detection and overrange/underrange detection.

The MAX1366/MAX1368 require a 2.7V to 5.25V supply,

a 4.75V to 5.25V V/I supply, and a 7V to 30V loop sup-

ply. They are available in a space-saving (7mm x

7mm), 48-pin TQFP package and operate over the

extended (-40°C to +85°C) temperature range.

19-3977; Rev 0; 1/06

Pin Configuration appears at end of data sheet.

Typical Operating Circuits appear at end of data sheet.

SPI/QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

4.5-/3.5-Digit Panel Meters with 4–20mA Output

Industrial Process Control

Automated Test Equipment

Data-Acquisition Systems

Digital Panel Meters

Digital Voltmeters

Digital Multimeters

________________________________________________________________ Maxim Integrated Products

General Description

Applications

Microcontroller-Interface,

♦ Microcontroller (µC)-Interface, Digital Panel Meter

♦ LED Display

♦ Output DAC and Current Driver

♦ 2.7V to 5.25V ADC/DAC Supply

♦ 4.75V to 5.25V V/I Converter Supply

♦ Internal 2.048V Reference or External Reference

♦ SPI™-/QSPI™-/MICROWIRE™-Compatible Serial

♦ 48-Pin, 7mm x 7mm TQFP Package

Interface

MAX1366ECM

MAX1368ECM

MAX1366ECM

MAX1368ECM

20-Bit Sigma-Delta ADC

No Integrating/Autozeroing Capacitors

100MΩ Input Impedance

±200mV or ±2.000V Input Range

Common-Cathode 7-Segment LED Driver

Programmable LED Current (0 to 20mA)

2.5Hz Update Rate

±15-Bit DAC with 14-Bit Linear V/I Converter

Selectable 0 to 16mA or 4–20mA Current Output

Unipolar/Bipolar Modes

±50µA Zero Scale, ±40ppmFS/°C (typ)

±0.5% Gain Error, ±25ppmFS/°C (typ)

Separate 7V to 30V Supply for Current-Loop

Output

4.5-Digit Resolution (±19,999 Count, MAX1366)

3.5-Digit Resolution (±1999 Count, MAX1368)

PART

PACKAGE CODE

Ordering Information

-40°C to +85°C

TEMP RANGE

C48-6

Selector Guide

Features

PIN-PACKAGE

RESOLUTION

48 TQFP

(DIGITS)

4.5

3.5

Related parts for MAX1366ECM

MAX1366ECM Summary of contents

Page 1

... Internal 2.048V Reference or External Reference ♦ SPI™-/QSPI™-/MICROWIRE™-Compatible Serial Interface ♦ 48-Pin, 7mm x 7mm TQFP Package Applications PART MAX1366ECM MAX1368ECM PART MAX1366ECM MAX1368ECM Features Ordering Information TEMP RANGE PIN-PACKAGE -40°C to +85°C 48 TQFP -40°C to +85°C ...

Page 2

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output ABSOLUTE MAXIMUM RATINGS (With reference to GND, unless otherwise specified .................................................................... AIN+, AIN-, REF+, REF-.........................V REG_FORCE, CMP, DAC_VDD, DACVOUT, CONV_IN, 4-20OUT .............................-0.3V to (AV EN_BPM, EN_I, REFSELE, DACDATA_SEL, ...

Page 3

Microcontroller-Interface, 4.5-/3.5-Digit Panel ELECTRICAL CHARACTERISTICS (continued) ( DAC_VDD = +2.7V to +5.25V, GND = 0, LEDG = reference 7V +5.0V, C EXT REG_AMP noted. All specifications are at T ...

Page 4

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output ELECTRICAL CHARACTERISTICS (continued) ( DAC_VDD = +2.7V to +5.25V, GND = 0, LEDG = reference 7V +5.0V, C EXT REG_AMP noted. All ...

Page 5

Page 6

Page 7

Microcontroller-Interface, 4.5-/3.5-Digit Panel ( +5V +5.0V, GND = 0, LEDG = 0, V VDD VDD DAC_VDD 0.1µF, REF- = GND, C EXT REF+ MAX1366 OFFSET ERROR vs. TEMPERATURE 0.6 0.5 ...

Page 8

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output ( +5V +5.0V, GND = 0, LEDG = 0, V VDD VDD DAC_VDD 0.1µF, REF- = GND, C EXT REF+ DATA OUTPUT RATE ...

Page 9

Microcontroller-Interface, 4.5-/3.5-Digit Panel ( +5V +5.0V, GND = 0, LEDG = 0, V VDD VDD DAC_VDD 0.1µF, REF- = GND, C EXT REF+ DAC GAIN ERROR vs. TEMPERATURE 0 -0.05 ...

Page 10

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output PIN NAME Positive Analog Input. Positive side of fully differential analog input. Bypass AIN+ to GND with a 1 AIN+ 0.1µF or greater capacitor. Negative Analog Input. Negative side of fully differential analog ...

Page 11

Microcontroller-Interface, 4.5-/3.5-Digit Panel PIN NAME Serial Clock Input. Apply an external clock to SCLK to facilitate communication through the serial 25 SCLK bus. SCLK may idle high or low. Serial Data Output. DOUT presents serial data in response to register ...

Page 12

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output AV DV CLK SCLK DIN DOUT SERIAL I/O AND CONTROL +2.5V AIN+ AIN- INPUT BUFFER REF+ REF- -2.5V BANDGAP REFERENCE CHARGE NEGV -2.5V PUMP MAX1366 (MAX1368) GND Detailed Description The ...

Page 13

Microcontroller-Interface, 4.5-/3.5-Digit Panel Internal Analog Input/Reference Buffers The MAX1366/MAX1368 analog input/reference buffers allow the use of high-impedance signal sources. The input buffers’ common-mode input range allows the ana- log inputs and the reference to range from -2.2V to +2.2V. The ...

Page 14

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output DIGIT 4 DIGIT 3 DIGIT 2 Figure 2. ...

Page 15

Microcontroller-Interface, 4.5-/3.5-Digit Panel SEGDP SEGG SEGF SEGE SEGD SEGC SEGB SEGA Figure 4. 2-Digit Common-Cathode Configuration DIGIT 4 (MSD) DIGIT 2 DIGIT 1 DIGIT 0 (LSD) DATA Figure 5. LED Voltage Waveform Table 2. Decimal-Point Control Table— MAX1366 DISPLAY DPON ...

Page 16

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output CS OR CS_DAC t CSS t CSH SCLK t DS DIN t DV DOUT Figure 6. ADC and DAC Timing Diagram CS SCLK 1 0 RS4 RS3 RS2 RS1 DIN CONTROL BYTE DOUT ...

Page 17

Microcontroller-Interface, 4.5-/3.5-Digit Panel CS CS_DAC SCLK 1 0 RS4 RS3 RS2 RS1 DIN CONTROL BYTE DOUT Figure 8. Serial-Interface, 8-Bit, Write Timing Diagram CS CS_DAC SCLK 1 1 RS4 RS3 RS2 RS1 RS0 DIN CONTROL BYTE DOUT Figure 9. Serial-Interface, ...

Page 18

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output CS CS_DAC SCLK 1 1 RS4 RS3 RS2 RS1 RS0 DIN CONTROL BYTE DOUT Figure 10. Serial-Interface, 8-Bit, Read Timing Diagram CS CS_DAC SCLK D15 D14 D13 D12 D11 D10 DIN Figure 11. ...

Page 19

Microcontroller-Interface, 4.5-/3.5-Digit Panel ACTIVE GAUGE DUMMY GAUGE Figure 14. Strain-Gauge Application with the MAX1366/MAX1368 THERMOCOUPLE JUNCTION MAX6062 Figure 15. Thermocouple Application with the MAX1366/MAX1368 ______________________________________________________________________________________ Meters with 4–20mA Output ANALOG SUPPLY FERRITE BEAD 10µF 0.1µ REF+ 0.1µF ...

Page 20

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output ADC LED RESULT > 4E1Fh 19,999 4E1Fh 2 0002h 1 0001h 0 0000h - 0 FFFFh - 1 FFFEh - 2 FFFDh -19,999 B1E0h < B1E0h - 1 ...

Page 21

Microcontroller-Interface, 4.5-/3.5-Digit Panel 1. ADC OUTPUT CODE FS = FULL SCALE Figure 20. DAC Output Voltage vs. ADC Output Code CURRENT OFFSET ENABLED (EN_I = ADC OUTPUT CODE ...

Page 22

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output Applications Information Power-On Reset At power-on, the serial interface, logic, LED drivers, digital filter, modulator, and DAC circuits reset. The registers return to their default values. The SPI/QSPI/MICROWIRE serial interface consists of a ...

Page 23

Microcontroller-Interface, 4.5-/3.5-Digit Panel Table 6. Register-Address Table REGISTER ADDRESS RS[4:0] 1 00000 2 00001 3 00010 4 00011 5 00100 6 00101 7 00110 8 00111 9 01000 10 01001 11 01010 12 10100 — All other addresses Table 7. ...

Page 24

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output Command Byte (Write Only) MSB Bit 7 Bit 6 Bit 5 START(1) R/W RS4 START: Start bit. The first 1 clocked into the MAX1366/ MAX1368 is the first bit of the command byte. ...

Page 25

Microcontroller-Interface, 4.5-/3.5-Digit Panel OFFSET_CAL1: (Default = 0.) Automatic offset-calibra- tion enable bit. When set to 1, the MAX1366/ MAX1368 disable automatic offset calibration. When this bit is set to zero, automatic offset calibration is enabled. SEG_SEL: (Default = 0.) SEG_SEL ...

Page 26

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output Underrange Register (Read/Write) MSB D15 D14 D13 D12 D11 Default values: 8300h (for 3.5-digit, -2000) B1E0h (for 4.5-digit, -20,000) The underrange data register is 16-bit read/write regis- ter (D15 is the MSB). When ...

Page 27

Microcontroller-Interface, 4.5-/3.5-Digit Panel LED Segment-Display Register 2 (Read/Write) MSB Bit 15 Bit Bit 7 Bit Default values: 0000h LED segment-display register 16-bit read/write register. When the SEG_SEL bit (in the control ...

Page 28

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output ADC Custom Offset-Calibration Register 3 (Read/Write) MSB D15 D14 D13 D12 D11 Default values: 0000h In addition to automatic offset calibration, the MAX1366/MAX1368 offer a user-defined custom offset 16-bit read/write register. The final ...

Page 29

Microcontroller-Interface, 4.5-/3.5-Digit Panel LED Data Register (Read/Write) MSB D15 D14 D13 D12 D11 Default values: B1E0h The peak data register is a 16-bit read-only register. Set the PEAK bit enable the PEAK function. This register stores the ...

Page 30

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output In either internal or external reference operation, bypass REF_DAC with a 0.1µF capacitor to GND. Choose a reference with output impedance (load regu- lation equivalent) of 100mΩ or less, such as the MAX6126. ...

Page 31

Microcontroller-Interface, 4.5-/3.5-Digit Panel The transfer function for the MAX1366 with AIN+ - AIN- < 0 and RANGE = DV is: DD  + − AIN AIN = ( ) 6 COUNT 1 024 .   + − ...

Page 32

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output R values below 25kΩ increase the I ISET the internal current-limit circuit limits the I 30mA. At higher I values, proper operation of the SEG device is not guaranteed. In addition, the power ...

Page 33

Microcontroller-Interface, 4.5-/3.5-Digit Panel Power-Supply Rejection (PSR)—ADC PSR is a measure of the data converter’s level of immu- nity to power-supply fluctuations. PSR assumes that the converter’s linearity is unaffected by changes in the power-supply voltage. Power-supply rejection ratio (PSRR) is ...

Page 34

Microcontroller-Interface, 4.5-/3.5-Digit Panel Meters with 4–20mA Output 7V TO 30V DEPLETION- MODE FET 4–20mA/0 TO 16mA CURRENT-LOOP OUTPUT PLC INPUT R L 0.1µF 10µF L 2.7V TO 5.25V 34 ______________________________________________________________________________________ MAX1368 Typical Operating Circuit 0.1µF GNDS SEGA–SEGDP DIGO AIN+ V ...

Page 35

Microcontroller-Interface, 4.5-/3.5-Digit Panel TOP VIEW AIN+ 1 AIN- 2 GND SET 6 REG_VDD 7 REG_FORCE 8 REG_AMP 9 CMP 10 DAC_VDD 11 DACVOUT 12 ______________________________________________________________________________________ Meters with 4–20mA Output SEGB 36 SEGA 35 ...

Page 36

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 36 © 2006 Maxim Integrated Products PACKAGE OUTLINE, 32/48L LQFP, 7x7x1 ...

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