Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX3100EEE+

AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and

ordering information, please contact Maxim Direct

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

General Description

The MAX3100 universal asynchronous receiver transmit-

ter (UART) is the first UART specifically optimized for

small microcontroller-based systems. Using an

SPI™/MICROWIRE™ interface for communication with

the host microcontroller (µC), the MAX3100 comes in a

compact 16-pin QSOP. The asynchronous I/O is suitable

for use in RS-232, RS-485, IR, and opto-isolated data

links. IR-link communication is easy with the MAX3100’s

infrared data association (IrDA) timing mode.

The MAX3100 includes a crystal oscillator and a baud-

rate generator with software-programmable divider ratios

for all common baud rates from 300 baud to 230k baud.

A software- or hardware-invoked shutdown lowers quies-

cent current to 10µA, while allowing the MAX3100 to

detect receiver activity.

An 8-word-deep first-in/first-out (FIFO) buffer minimizes

processor overhead. This device also includes a flexible

interrupt with four maskable sources, including address

recognition on 9-bit networks. Two hardware-handshak-

ing control lines are included (one input and one output).

The MAX3100 is available in 14-pin plastic DIP and small,

16-pin QSOP packages in the commercial and extended

temperature ranges.

________________________Applications

Handheld Instruments

Intelligent Instrumentation

UART in SPI Systems

Small Networks in HVAC or Building Control

Isolated RS-232/RS-485: Directly Drives Opto-Couplers

Low-Cost IR Data Links for Computers/Peripherals

____________________________Features

♦ Small TQFN and QSOP Packages Available

♦ Full-Featured UART:

—IrDA SIR Timing Compatible

—8-Word FIFO Minimizes Processor

Overhead at High Data Rates

—Up to 230k Baud with a 3.6864MHz Crystal

—9-Bit Address-Recognition Interrupt

—Receive Activity Interrupt in Shutdown

♦ SPI/MICROWIRE-Compatible µC Interface

♦ Lowest Power:

—150µA Operating Current at 3.3V

—10µA in Shutdown with Receive Interrupt

♦ +2.7V to +5.5V Supply Voltage in Operating Mode

♦ Schmitt-Trigger Inputs for Opto-Couplers

♦ TX and RTS Outputs Sink 25mA for Opto-Couplers

SPI/MICROWIRE-Compatible

UART in QSOP-16

RTSCS

SCLK

DOUT

DIN

TOP VIEW

MAX3100

CTS

GND

SHDN

IRQ

DIP

RTS

N.C.

CTS

DIN

DOUT

SCLK

N.C.

IRQ

SHDN

GND

MAX3100

QSOP

TQFN-EP

MAX3100

123456

18 17 16 15 14 13

N.C.

DOUT

SCLK

IRQ

N.C.

CTS

N.C.

DIN

N.C.

GND

N.C.

*EP = EXPOSED PAD, CONNECT EP TO GROUND

SHDN

RTS

*EP

+ +

Pin Configurations

SPI is a trademark of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.

Pin Configurations

SPI is a trademark of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.

Pin Configurations

19-1259; Rev 2; 1/09

PART

MAX3100CPD+

MAX3100CEE+ 0°C to +70°C

0°C to +70°C

TEMP RANGE PIN-PACKAGE

14 Plastic DIP

16 QSOP

Ordering Information

Typical Operating Circuit appears at end of data sheet.

MAX3100EPD+

MAX3100EEE+ -40°C to +85°C

-40°C to +85°C 14 Plastic DIP

16 QSOP

MAX3100ETG+ -40°C to +85°C 24 TQFN-EP*

Denotes a lead(Pb)-free/RoHS-compliant package.

EP = Exposed pad.

MAX3100

SPI is a trademark of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.

Summary of content (24 pages)

PAGE 1
MAX3100 LE AVAILAB SPI/MICROWIRE-Compatible UART in QSOP-16 General Description ____________________________Features The MAX3100 universal asynchronous receiver transmitter (UART) is the first UART specifically optimized for small microcontroller-based systems. Using an SPI™/MICROWIRE™ interface for communication with the host microcontroller (µC), the MAX3100 comes in a compact 16-pin QSOP. The asynchronous I/O is suitable for use in RS-232, RS-485, IR, and opto-isolated data links.
PAGE 2
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 ABSOLUTE MAXIMUM RATINGS VCC to GND ...........................................................................+6V Input Voltage to GND (CS, SHDN, X1, CTS, RX, DIN, SCLK) ....-0.3V to (VCC + 0.3V) Output Voltage to GND (DOUT, RTS, TX, X2) ..............................-0.3V to (VCC + 0.3V) IRQ...........................................................................-0.3V to 6V TX, RTS Output Current ....................................................
PAGE 3
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V to +5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 __________________________________________Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) 700 600 500 VCC = 5V 400 300 VCC = 3.3V 200 7 6 5 4 3 0 40 20 60 80 MAX3100-03 200 -20 0 20 40 60 80 0 100 1 2 4 3 5 TEMPERATURE (°C) EXTERNAL CLOCK FREQUENCY (MHz) SUPPLY CURRENT vs. BAUD RATE TX, RTS, DOUT OUTPUT CURRENT vs. OUTPUT LOW VOLTAGE (VCC = 3.3V) TX, RTS, DOUT OUTPUT CURRENT vs.
PAGE 5
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 Pin Description PIN NAME FUNCTION QSOP DIP TQFN-EP 1 1 23 DIN 2 2 2 DOUT SPI/MICROWIRE Serial-Data Output. High impedance when CS is high. 3 3 3 SCLK SPI/MICROWIRE Serial-Clock Input. Schmitt-trigger input. 4 4 4 CS Active-Low Chip-Select Input. DOUT goes high impedance when CS is high, IRQ, TX, and RTS are always active. Schmitt-trigger input. 6 5 5 IRQ Active-Low Interrupt Output. Open-drain interrupt output to microprocessor.
PAGE 6
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 9 Pt TX-BUFFER REGISTER 9 TX-SHIFT REGISTER D0t–D7t Pt TX SHDN DIN CS SCLK X1 SPI INTERFACE DOUT B0 B1 B2 B3 XTAL BAUD-RATE GENERATOR RA ACTIVITY DETECT X2 FE START/STOPBIT DETECT Pr RX-SHIFT REGISTER D0r–D7r RX 9 (SOURCES) T R Pr RA/FE (MASKS) Pr RX-BUFFER REGISTER Pr RX-BUFFER REGISTER CTS I/O TRANSMIT-DONE (TM) IRQ INTERRUPT LOGIC DATA-RECEIVED (RM) RTS 9 PARITY (PM) FRAMING ERROR (RAM)/ RECEIVE ACTIVITY Figure 2.
PAGE 7
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 ONE BAUD PERIOD RX A BAUD BLOCK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 MAJORITY CENTER SAMPLER Figure 3. Start-Bit Timing DATA UPDATED CS SCLK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 DIN 1 1 FEN SHDN TM RM PM RAM IR ST PE L B3 B2 B1 B0 DOUT R T 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Figure 4. SPI Interface (Write Configuration) The receiver section receives data in serial form.
PAGE 8
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 MAX3100 Operations MAX3100. The device enters test mode if bit 0 = 1. In this mode, if CS = 0, the RTS pin acts as the 16x clock generator’s output. This may be useful for direct baudrate generation (in this mode, TX and RX are in digital loopback). Normally, the write-data register loads the TX-buffer register. To change the RTS pin’s state without writing data, set the TE bit. Setting the TE bit high inhibits the write command (Table 3).
PAGE 9
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 Table 5. Bit Descriptions BIT NAME READ/ WRITE POR STATE B0–B3 w 0000 Baud-Rate Divisor Select Bits. Sets the baud clock’s value (Table 6). B0–B3 r 0000 Baud-Rate Divisor Select Bits. Reads the 4-bit baud clock value assigned to these registers. CTS r No change D0t–D7t w X D0r–D7r r 00000000 FEN w 0 FIFO Enable. Enables the receive FIFO when FEN = 0. When FEN = 1, FIFO is disabled. FEN r 0 FIFO-Enable Readback. FEN’s state is read.
PAGE 10
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 Table 5. Bit Descriptions (continued) BIT NAME RA/FE READ/ WRITE r POR STATE DESCRIPTION 0 Receiver-Activity/Framing-Error Bit. In shutdown mode, this is the RA bit. In normal operation, this is the FE bit. In shutdown mode, a transition on RX sets RA = 1. In normal mode, a framing error sets FE = 1. A framing error occurs if a zero is received when the first stop bit is expected.
PAGE 11
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 Interrupt Sources and Masks A Read Data operation clears the interrupt IRQ. Table 6 gives the details for each interrupt source. Figure 6 shows the functional diagram for the interrupt sources and mask blocks. Table 6. Interrupt Sources and Masks—Bit Descriptions BIT NAME MASK BIT MEANING WHEN SET DESCRIPTION Pr PM Received parity bit = 1 The Pr bit reflects the value in the word currently in the receive-buffer register (oldest data available).
PAGE 12
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 Table 7. Baud-Rate Selection Table* B3 BAUD B2 B1 B0 DIVISION RATIO BAUD RATE (fOSC = 1.8432MHz) BAUD RATE (fOSC = 3.6864MHz) 0 0 0 0** 1 115.2k** 230.4k** 0 0 0 1 2 57.6k 115.2k 0 0 1 0 4 28.8k 57.6k 0 0 1 1 8 14.4k 28.8k 0 1 0 0 16 7200 14.4k 0 1 0 1 32 3600 7200 0 1 1 0 64 1800 3600 0 1 1 1 128 900 1800 1 0 0 0 3 38.4k 76.8k 1 0 0 1 6 19.2k 38.
PAGE 13
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 ISO +5V 2kΩ VCC 6N136 DIN 470Ω MAX3100 DOUT ISO +5V 2kΩ VCC MAX3222 6N136 SCLK TX RX 470Ω CTS SCLK VCC RTS 2k 470Ω 6N136 DIN DOUT 2kΩ VCC 6N136 CS 470Ω CS +5V MBR0520 MAX667 LINEAR REGULATOR ISO 5V MAX253 TRANSFORMER DRIVER HALO TGM-010P3 Figure 7.
PAGE 14
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 ISO +5V +5V 2kΩ VCC VCC TX RX CS CS 470Ω SCLK DIN SCLK MAX3100 MAX3100 DOUT DIN DOUT +5V 2kΩ RX TX GND 470Ω GND Figure 8. Bidirectional Opto-Isolated Interface Table 8. Component and Supplier List DESCRIPTION FREQUENCY (MHz) TYPICAL C1, C2 (pF) SUPPLIER Through-Hole Crystal (HC-49/U) 1.8432 25 ECS International, Inc. ECS-18-13-1 (913) 782-7787 Through-Hole Resonator 1.8432 47 Murata North America CSA1.
PAGE 15
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 The MAX3100 X1 input can be driven directly by an external CMOS clock source. The trip level is approximately equal to VCC / 2. No connection should be made to X2 in this mode. If a TTL or non-CMOS clock source is used, AC couple with a 10nF capacitor to X1. The peak-to-peak swing on the input should be at least 2V for reliable operation.
PAGE 16
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 DIRECT OPTO-COUPLER DRIVE IR MODULE DRIVE OR +5V 330Ω MAX3221 IR LED TX +5V 100Ω MAX3100 TXD TX 8051 1/6 HC00 IR MODULE 3100 0.1μF IRQ RX 1.8432MHz 22pF RXD RX 10kΩ 1/6 HC00 22pF Figure 10. Bidirectional RS-232 IrDA Using an 8051 Interface to PIC Processor (“Quick Brown Fox” Generator) Figure 11 illustrates the use of the MAX3100 with the PIC®.
PAGE 17
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 VCC RB7 GO 100kΩ PIC16C54 RB6 Y/N 1μs Delay RA0 DIN MAX3221 100kΩ MAX3100 1/2 STOP BITS RB5 RA1 DOUT RB4 RA2 SCLK RB3 RA3 CS TX TX 100kΩ 7/8 BITS 100kΩ B3 100kΩ X1 X2 RB2 B2 100kΩ 1. 8432MHz 22pF 22pF RB1 B1 100kΩ RB0 B0 100kΩ Figure 11.
PAGE 18
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 __________MAX3100 Synchronous-to-Asynchronous SPI UART at a Glance Table 9.
PAGE 19
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 Table 11.
PAGE 20
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 Figure 12a.
PAGE 21
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 Figure 12b.
PAGE 22
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 Figure 12b.
PAGE 23
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 ___________________________________________________Typical Operating Circuit μC MAX3223 MAX3100 SPI/MICROWIRE RS-232 I/O DIN TX DOUT RX SCLK CTS CS RTS IRQ C1 C2 ___________________Chip Information PROCESS: BiCMOS SUBSTRATE CONNECTED TO GND Maxim Integrated Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
PAGE 24
MAX3100 SPI/MICROWIRE-Compatible UART in QSOP-16 Revision History REVISION NUMBER REVISION DATE 1 12/01 Changed pin labeling 2 1/09 Added 24 TQFN information DESCRIPTION PAGES CHANGED 17 1, 2, 5, 24 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.