Datasheet

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

MAX6952

4-Wire Interfaced, 2.7V to 5.5V,

4-Digit 5

7 Matrix LED Display Driver

________________________________________________________________ Maxim Integrated Products 1

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.

General Description

The MAX6952 is a compact cathode-row display driver

that interfaces microprocessors to 5

7 dot-matrix LED

displays through an SPI™-compatible serial interface.

The MAX6952 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 a 2-wire interfaced version, refer to the MAX6953

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

Features

♦ High-Speed 26MHz with SPI-/QSPI-™/

MICROWIRE™-Compatible Serial Interface

♦ 2.7V to 5.5V Operation

♦ Drives Four Monocolor or Two Bicolor Cathode-

Row 5

7 Matrix Displays

♦ Built-In ASCII 104-Character Font

♦ 24 User-Definable Characters Available

♦ Automatic Blinking Control for Each Segment

♦ 36µA 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

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

DIN

CLK

DOUT

SET

26pF

SET

53.6kΩ

MAX6952

BLINK

3.3V

4.7kΩ

Typical Application Circuit

19-2437; Rev 1; 10/02

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX6952EAX -40°C to +85°C 36 SSOP

MAX6952EPL -40°C to +85°C 40 PDIP

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corp.

Pin Configurations appear at end of data sheet.

Message Boards

Medical Equipment

Industrial Displays

Audio/Video

Equipment

Gaming Machines

Applications

Summary of content (21 pages)

PAGE 1
9-2437; Rev 1; 10/02 KIT ATION EVALU E L B AVAILA 4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver Features ♦ High-Speed 26MHz with SPI-/QSPI-™/ MICROWIRE™-Compatible Serial Interface ♦ 2.7V to 5.
PAGE 2
MAX6952 4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver 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
4-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 SYMBOL CONDITIONS MIN TYP MAX UNITS LOGIC INPUTS AND OUTPUTS Input High Voltage DIN, CLK, CS VIH Input Low Voltage DIN, CLK, CS VIL Input Leakage DIN, CLK, CS, OSC IIH, IIL DOUT Output Low Voltage VOLDO 2.4 -2 ISINK = 1.6mA DOUT Output High Voltage VOHDO ISOURCE = 1.
PAGE 4
Typical Operating Characteristics (Typical application circuit, V+ = 3.3V, LED forward voltage = 2.4V, scan limit set to 4 digits, TA = +25°C, unless otherwise noted.) INTERNAL OSCILLATOR FREQUENCY vs. SUPPLY VOLTAGE V+ = 3.3V 4.00 V+ = 5V 3.90 4.3 4.2 2.0 VOLTAGE AT OSC (V) 4.10 2.5 MAX6952 toc02 V+ = 2.7V 4.20 4.4 OSCILLATOR FREQUENCY (MHz) MAX6952 toc01 4.30 INTERNAL OSCILLATOR WAVEFORM AT OSC 4.1 4.0 3.9 MAX6952 toc03 INTERNAL OSCILLATOR FREQUENCY vs.
PAGE 5
4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver PIN NAME FUNCTION SSOP PDIP 1, 2, 3, 6–14, 23, 24 1, 2, 3, 7–15, 26, 27 O0 to O13 4, 5, 16 4, 5, 6, 18 GND Ground 15 17 ISET Segment Current Setting. Connect ISET to GND through series resistor RSET to set the peak current. 17 19 BLINK 18 20 DIN Serial Data Input. Data is loaded into the internal 16-bit shift register on the rising edge of the CLK. Serial-Clock Input.
PAGE 6
MAX6952 4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver Table 1.
PAGE 7
4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver 5) Take CLK low. Figure 3 shows a write operation when 16 bits are transmitted. If fewer or greater than 16 bits are clocked into the MAX6952 between taking CS low and taking CS high again, the MAX6952 stores the last 16 bits received, including the previous transmission(s). The general case is when n bits (where n > 16) are transmitted to the MAX6952.
PAGE 8
MAX6952 4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver tCSW CS tCL tCSS CLK tDS DIN tCH tCSH tCP tDH D15 D14 D1 D0 tDO D15 DOUT TIMING NOT TO SCALE. Figure 2. Timing Diagram CS CLK DIN D15 =0 D13 D14 D11 D12 D10 D9 D8 D6 D7 D5 D4 D3 D2 D1 D0 D15 = 0 DOUT Figure 3.
PAGE 9
4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver MAX6952 Table 4. Register Address Map ADDRESS (COMMAND BYTE) REGISTER HEX CODE D15 D14 D13 D12 D11 D10 D9 D8 No-Op R/W 0 0 0 0 0 0 0 0x00 Intensity10 R/W 0 0 0 0 0 0 1 0x01 Intensity32 R/W 0 0 0 0 0 1 0 0x02 Scan-Limit R/W 0 0 0 0 0 1 1 0x03 Configuration R/W 0 0 0 0 1 0 0 0x04 User-Defined Fonts R/W 0 0 0 0 1 0 1 0x05 Factory reserved. Do not write to this.
PAGE 10
MAX6952 4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver Shutdown Mode (S Data Bit D0) Format The S bit in the configuration register selects shutdown or normal operation (Table 7). The display driver can be programmed while in shutdown mode, and shutdown mode is overridden when in display test mode. For normal operation, the S bit should be set to 1. Blink Rate Selection (B Data Bit D2) Format The B bit in the configuration register selects the blink rate.
PAGE 11
4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver Global Blink Timing Synchronization (T Data Bit D4) Format By setting the T bit in multiple MAX6952s at the same time (or in quick succession), the blink timing can be synchronized across all the devices (Table 11). Note that the display multiplexing sequence is also reset, which might give rise to a one-time display flicker when the register is written.
PAGE 12
MAX6952 4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver indirectly accesses the font data. The font address pointer can be written, setting one of 120 addresses between 0x00 and 0xF7, but cannot be read back. The font data is written to and read from the MAX6952 indirectly, using this font address pointer. Unused font locations can be used as general-purpose scratch RAM, bearing in mind that the font registers are only 7 bits wide, not 8.
PAGE 13
4-Wire Interfaced, 2.7V to 5.
PAGE 14
MAX6952 4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver Table 15. Memory Mapping of User-Defined Font Register 0x05 ADDRESS CODE (HEX) REGISTER DATA SPI READ OR WRITE FUNCTION 0x85 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 15
4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver MAX6952 Table 17.
PAGE 16
MAX6952 4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver Table 18.
PAGE 17
4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver DUTY CYCLE TYPICAL SEGMENT CURRENT (mA) ADDRESS CODE (HEX) 1/16 (min on) 2.5 0x01, 0x02 0 0 0 0 0xX0 2/16 5 0x01, 0x02 0 0 0 1 0xX1 3/16 7.5 0x01, 0x02 0 0 1 0 0xX2 4/16 10 0x01, 0x02 0 0 1 1 0xX3 5/16 12.5 0x01, 0x02 0 1 0 0 0xX4 6/16 15 0x01, 0x02 0 1 0 1 0xX5 7/16 17.5 0x01, 0x02 0 1 1 0 0xX6 8/16 20 0x01, 0x02 0 1 1 1 0xX7 9/16 22.
PAGE 18
MAX6952 4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver Table 23. Display-Test Register Format REGISTER DATA MODE ADDRESS CODE (HEX) D7 D6 D5 D4 D3 D2 D1 D0 Normal operation 0x07 X X X X X X X 0 Display test 0x07 X X X X X X X 1 The voltage drop across the drivers with a nominal 5V supply (5.0V - 2.4V) = 2.6V is nearly 3 times the drop across the drivers with a nominal 3.3V supply (3.3V 2.4V) = 0.9V.
PAGE 19
4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver MAX6952 START OF NEXT CYCLE ONE COMPLETE 1.
PAGE 20
MAX6952 4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 ✕ 7 Matrix LED Display Driver Board Layout Chip Information When designing a board, use the following guidelines: 1) The RSET connection to the ISET pin is a high-impedance node, and sensitive to layout. Place RSET right next to the ISET pin and route RSET directly to these pins with very short tracks.
PAGE 21
4-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 0.096 0.104 0.004 0.011 0.012 0.017 0.009 0.013 0.0315 BSC 0.291 0.299 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.