Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - display driver LED 5 x 7 (matrix) 4 numbers I²C 12 mA SSOP 36

General Description

The MAX6953 is a compact cathode-row display driver

that interfaces microprocessors to 5

7 dot-matrix LED

displays through an I

C™-compatible serial interface.

The MAX6953 drives up to four digits (140 LEDs).

Included on-chip are an ASCII 104-character font, mul-

tiplex scan circuitry, column and row drivers, and static

RAM that stores each digit, as well as font data for 24

user-definable characters. The segment current for the

LEDs is set by an internal digit-by-digit digital bright-

ness control.

The device includes a low-power shutdown mode, seg-

ment blinking (synchronized across multiple drivers, if

desired), and a test mode that forces all LEDs on. The

LED drivers are slew-rate limited to reduce EMI.

For an SPI™-compatible version, refer to the MAX6952

data sheet. An EV kit is available for the MAX6952.

Applications

Message Boards

Medical Equipment

Industrial Displays

Audio/Video Equipment

Gaming Machines

Features

♦ 400kbps 2-Wire Interface Compatible with I

♦ 2.7V to 5.5V Operation

♦ Drives 4 Monocolor or 2 Bicolor Cathode-Row

7 Matrix Displays

♦ Built-In ASCII 104-Character Font

♦ 24 User-Definable Characters Available

♦ Automatic Blinking Control for Each Segment

♦ 70µA Low-Power Shutdown (Data Retained)

♦ 16-Step Digital Brightness Control

♦ Display Blanked on Power-Up

♦ Slew-Rate-Limited Segment Drivers for Lower EMI

♦ 36-Pin SSOP and 40-Pin DIP Packages

♦ Extended Temperature Range as Standard

MAX6953

2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5

Matrix LED Display Driver

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

DIGIT 1

DIGIT 0

O14

O15

O16

O17

O18

O19

O20

O21

O22

O23

O10

O11

O12

O13

O14

O15

O16

O17

O18

DIGIT 3

O10

O11

O12

O13

O19

O20

O21

O22

O23

DIGIT 2

3.3V

100nF

47µF

O10

O11

O12

O13

O14

O15

O16

O17

O18

O19

O20

O21

O22

O23

ISET

OSC

V+

GND

BLINK

V+

GND

SDA

SCL

AD1

26pF

SET

53.6kΩ

SET

MAX6953

AD0

3.3V

4.7kΩ

Typical Application Circuit

19-2312; Rev 3; 3/04

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.

PART TEMP RANGE PIN-PACKAGE

MAX6953EAX -40°C to +85°C 36 SSOP

MAX6953EPL -40°C to +85°C 40 PDIP

C is a trademark of Philips Corp.

SPI is a trademark of Motorola, Inc.

Pin Configurations appear at end of data sheet.

Summary of content (23 pages)

PAGE 1
9-2312; Rev 3; 3/04 2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver Features ♦ 400kbps 2-Wire Interface Compatible with I2C The MAX6953 is a compact cathode-row display driver that interfaces microprocessors to 5 ✕ 7 dot-matrix LED displays through an I2C™-compatible serial interface. The MAX6953 drives up to four digits (140 LEDs).
PAGE 2
MAX6953 2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 Matrix LED Display Driver ✕ 7 ABSOLUTE MAXIMUM RATINGS Voltage (with Respect to GND) V+ .............................................................................-0.3V to +6V All Other Pins................................................-0.3V to (V+ + 0.3V) O0–O13 Sink Current ....................................................... 500mA O14–O23 Source Current ..................................................
PAGE 3
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver (Typical operating circuit, V+ = 3.0V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1) PARAMETER Segment Current Slew Rate Segment Drive Current Matching (Within IC) SYMBOL ∆ISEG/∆t ∆ISEG CONDITIONS MIN TYP MAX UNITS TA = +25oC 12.
PAGE 4
✕ 7 MAX6953 TIMING CHARACTERISTICS (continued) (V+ = 2.7V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS Fall Time of SDA Transmitting tF (Notes 2, 5) Pulse Width of Spike Suppressed tSP (Note 6) Capacitive Load for Each Bus Line CB (Note 2) MIN TYP MAX UNITS 20 + 0.1CB 250 ns 0 50 ns 400 pF Note 1: All parameters tested at TA = +25°C. Specifications over temperature are guaranteed by design. Note 2: Guaranteed by design.
PAGE 5
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver DEAD CLOCK OSCILLATOR FREQUENCY vs. SUPPLY VOLTAGE 95 90 85 1.00 0.99 GROUND FOR ANODE (PIN 014) 0.98 0.97 0.96 0.95 80 2.5 3.0 3.5 4.0 4.5 5.0 MAX6953 toc06 MAX6953 toc05 MAX6953 toc04 100 1.01 CURRENT NORMALIZED TO 40mA OSCILLATOR FREQUENCY (kHz) 105 WAVEFORMS AT O2 (PIN 3) AND O14 (PIN 28) V+ = 3.3V, 8/16 INTENSITY OUTPUT SOURCE CURRENT vs. SUPPLY VOLTAGE 5.5 2.5 3.0 3.5 4.0 4.5 5.0 5.
PAGE 6
MAX6953 2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 Matrix LED Display Driver ISET OSC CURRENT SOURCE PWM BRIGHTNESS CONTROL DIVIDER/ COUNTER NETWORK ROW MULTIPLEXER O0 TO O23 ters are uploaded by the user into on-chip RAM through the serial interface and are lost when the device is powered down. Figure 1 is the MAX6953 functional diagram. Serial Addressing The MAX6953 operates as a slave that sends and receives data through an I2C-compatible 2-wire interface.
PAGE 7
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver Acknowledge The acknowledge bit is a clocked 9th bit that the recipient uses to handshake receipt of each byte of data (Figure 5). Thus, each byte transferred effectively requires 9 bits. The master generates the 9th clock pulse, and the recipient pulls down SDA during the acknowledge clock pulse, such that the SDA line is stable low during the high period of the clock pulse.
PAGE 8
MAX6953 2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 Matrix LED Display Driver ✕ 7 SDA SCL S P START CONDITION STOP CONDITION Figure 3. Start and Stop Conditions SDA SCL DATA LINE STABLE, CHANGE OF DATA ALLOWED DATA VALID Figure 4. Bit Transfer START CONDITION SCL CLOCK PULSE FOR ACKNOWLEDGMENT 8 2 1 9 SDA BY TRANSMITTER SDA BY RECEIVER S Figure 5. Acknowledge SDA 1 SCL START MSB 0 1 A3 A2 A1 A0 R/W LSB Figure 6.
PAGE 9
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver D14 D13 D12 D11 D10 D9 MAX6953 D15 COMMAND BYTE IS STORED ON RECEIPT OF STOP CONDITION D8 ACKNOWLEDGE FROM MAX6953 S SLAVE ADDRESS 0 A A COMMAND BYTE R/W P ACKNOWLEDGE FROM MAX6953 Figure 7.
PAGE 10
MAX6953 2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 Matrix LED Display Driver ACKNOWLEDGE FROM MAX6953 HOW COMMAND BYTE AND DATA BYTE MAP INTO MAX6953'S REGISTERS D15 D14 D13 D12 D11 D10 D9 7 ✕ ACKNOWLEDGE FROM MAX6953 D8 D7 D6 D5 D4 D3 D2 D1 D0 ACKNOWLEDGE FROM MAX6953 S SLAVE ADDRESS 0 A COMMAND BYTE DATA BYTE A A P n BYTES R/W AUTOINCREMENT MEMORY WORD ADDRESS Figure 9. n Data Bytes Received digit appears to flip between two characters.
PAGE 11
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver COMMAND BYTE ADDRESS RANGE x0000000 to x0000100 AUTOINCREMENT BEHAVIOR Command byte address autoincrements after byte read or written. x0000101 Command byte address remains at x0000101 after byte read or written, but the font address pointer autoincrements. x0000110 Factory reserved; do not write to this register. x000111 to x1111110 x1111111 Command byte address autoincrements after byte read or written.
PAGE 12
MAX6953 2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 Matrix LED Display Driver ✕ 7 Table 6.
PAGE 13
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver REGISTER DATA MODE D7 D6 D5 D4 D3 D2 D1 D0 Blink function is disabled. P X R T 0 B X S Blink function is enabled. P X R T 1 B X S Global Blink Enable/Disable (E Data Bit D3) Format The E bit globally enables or disables the blink feature of the device (Table 10). When blink is globally enabled, then the digit data in both planes P0 and P1 are used to control the display (Table 11).
PAGE 14
MAX6953 2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 Matrix LED Display Driver Table 15. Character Map MSB x000 x001 0000 RAM00 RAM16 0001 RAM01 RAM17 LSB x010 x011 x100 x101 x110 x111 ✕ 7 Global Clear Digit Data (R Data Bit D5) Format When global digit data clear is set, the digit data for both planes P0 and P1 for all digits are cleared during the acknowledge (Table 13).
PAGE 15
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver MAX6953 Table 16. Memory Mapping of User-Defined Font Register 0x05 ADDRESS CODE (HEX) REGISTER DATA I2C READ OR WRITE 0x05 0x00–0x7F Read Read 7-bit user-definable font data entry from current font address. MSB of the register data is clear. Font address pointer is incremented after the read. 0x05 0x00–0x7F Write Write 7-bit user-definable font data entry to current font address.
PAGE 16
MAX6953 2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 Matrix LED Display Driver ✕ 7 START OF NEXT CYCLE ONE COMPLETE 1.
PAGE 17
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver MAX6953 Table 18.
PAGE 18
MAX6953 2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 Matrix LED Display Driver ✕ 7 Table 19.
PAGE 19
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver The effective value of CSET includes not only the actual external capacitor used, but also the stray capacitance from OSC to GND. This capacitance is usually in the 1pF to 5pF range, depending on the layout used. Display-Test Register The display-test register switches the drivers between one of two modes: normal and display test.
PAGE 20
MAX6953 2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 Matrix LED Display Driver ✕ 7 Table 23. Intensity Register Format for Digit 0 (Address 0x01) and Digit 2 (Address 0x02) DUTY CYCLE TYPICAL SEGMENT CURRENT (mA) ADDRESS CODE (HEX) 1/16 (min on) 2.5 2/16 5 3/16 D3 D2 D1 D0 HEX CODE 0x01, 0x02 0 0 0 0 0xX0 0x01, 0x02 0 0 0 1 0xX1 7.5 0x01, 0x02 0 0 1 0 0xX2 4/16 10 0x01, 0x02 0 0 1 1 0xX3 5/16 12.
PAGE 21
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver Computing Power Dissipation The upper limit for power dissipation (PD) for the MAX6953 is determined from the following equation: PD = (V+ ✕ 15mA) + (V+ - VLED) (DUTY ✕ ISEG ✕ N) where: So TA = +107°C. Thus, the part can be operated safely at a maximum package temperature of +85°C. Power Supplies The MAX6953 operates from a single 2.7V to 5.5V power supply. Bypass the power supply to GND with a 0.
PAGE 22
2-Wire Interfaced, 2.7V to 5.
PAGE 23
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver SSOP.EPS 36 E DIM A A1 B C e E H L D H INCHES MILLIMETERS MAX MIN 0.104 0.096 0.004 0.011 0.017 0.012 0.013 0.009 0.0315 BSC 0.299 0.291 0.398 0.414 0.040 0.020 0.598 0.612 MAX MIN 2.65 2.44 0.29 0.10 0.44 0.30 0.23 0.32 0.80 BSC 7.40 7.60 10.11 10.51 0.51 15.20 1.02 15.55 1 TOP VIEW D A1 e A B C 0∞-8∞ L FRONT VIEW SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, 36L SSOP, 0.