MAX6954AAX-T Maxim Integrated Products, MAX6954AAX-T Datasheet

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MAX6954AAX-T

Manufacturer Part Number
MAX6954AAX-T
Description
LED Drivers 7-, 14-, 16-Segment LED Display Driver,
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX6954AAX.pdf (39 pages)

Specifications of MAX6954AAX-T

Number Of Digits
16
Number Of Segments
128
Low Level Output Current
935000 uA
High Level Output Current
55000 uA
Operating Supply Voltage
2.7 V to 5.5 V
Maximum Supply Current
30000 uA
Maximum Power Dissipation
941 mW
Maximum Operating Temperature
+ 125 C
Mounting Style
SMD/SMT
Package / Case
SSOP-36
Minimum Operating Temperature
- 40 C
The MAX6954 is a compact display driver that inter-
faces microprocessors to a mix of 7-segment, 14-seg-
ment, and 16-segment LED displays through an SPI™-
or QSPI™-compatible 4-wire serial interface. The serial
interface may be cascaded through multiple devices.
The MAX6954 drives up to 16 digits 7-segment, 8 digits
14-segment, 8 digits 16-segment, or 128 discrete
LEDs, while functioning from a supply voltage as low as
2.7V. The driver includes five I/O expander (or GPIO)
lines, some or all of which may be configured as a key-
switch reader, which automatically scans and
debounces a matrix of up to 32 switches.
Included on chip are full 14- and 16-segment ASCII
104-character fonts, a hexadecimal font for 7-segment
displays, multiplex scan circuitry, anode and cathode
drivers, and static RAM that stores each digit. The max-
imum segment current for the display digits is set using
a single external resistor. Digit intensity can be inde-
pendently adjusted using the 16-step internal digital
brightness control. The MAX6954 includes a low-power
shutdown mode, a scan-limit register that allows the
user to display from 1 to 16 digits, segment blinking
(synchronized across multiple drivers, if desired), and a
test mode, which forces all LEDs on. The LED drivers
are slew-rate limited to reduce EMI.
For a 2-wire interfaced version, refer to the MAX6955
data sheet. An evaluation kit (EV kit) for the MAX6955 is
available.
19-2460; Rev 4; 3/09
+ Denotes a lead-free/RoHS-compliant package.
* EP = Exposed pad.
Pin Configurations and Typical Operating Circuits appear
at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX6954AAX
MAX6954APL
MAX6954ATL+
PART
Set-Top Boxes
Panel Meters
White Goods
4-Wire Interfaced, 2.7V to 5.5V LED Display
________________________________________________________________ Maxim Integrated Products
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
TEMP RANGE
Driver with I/O Expander and Key Scan
Ordering Information
General Description
Automotive
Bar Graph Displays
Audio/Video Equipment
Applications
PIN-PACKAGE
36 SSOP
40 PDIP
40 TQFN-EP*
♦ High-Speed 26MHz SPI/QSPI/MICROWIRE™-
♦ 2.7V to 5.5V Operation
♦ Drives Up to 16 Digits 7-Segment, 8 Digits
♦ Drives Common-Cathode Monocolor and Bicolor
♦ Built-In ASCII 104-Character Font for 14-Segment
♦ Automatic Blinking Control for each Segment
♦ 10µA (typ) Low-Power Shutdown (Data Retained)
♦ 16-Step Digit-by-Digit Digital Brightness Control
♦ Display Blanked on Power-Up
♦ Slew-Rate Limited Segment Drivers for Lower EMI
♦ Five GPIO Port Pins Can Be Configured as Key-
♦ IRQ Output when a Key Input Is Debounced
♦ 36-Pin SSOP and 40-Pin DIP and TQFN Packages
♦ Automotive Temperature Range Standard
Compatible Serial Interface
14-Segment, 8 Digits 16-Segment, 128 Discrete
LEDs, or a Combination of Digit Types
LED Displays
and 16-Segment Digits and Hexadecimal Font for
7-Segment Digits
Switch Reader to Scan and Debounce Up to 32
Switches with n-Key Rollover
OSC_OUT
BLINK
DOUT
ISET
OSC
CLK
DIN
CS
COUNTER
NETWORK
DIVIDER/
CURRENT
SOURCE
CONTROL
BLINK
RAM
4-WIRE SERIAL INTERFACE
MAX6954
Functional Diagram
AND KEY-SCAN
MULTIPLEXER
BRIGHTNESS
CONTROL
CONTROL
DIGIT
PWM
GPIO
CONFIGURATION
CHARACTER
GENERATOR
REGISTER
ROM
DRIVERS
LED
Features
P0 TO P4
O0 TO O23
1

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MAX6954AAX-T Summary of contents

Page 1

... Set-Top Boxes Automotive Panel Meters Bar Graph Displays White Goods Audio/Video Equipment Ordering Information PART TEMP RANGE MAX6954AAX -40°C to +125°C MAX6954APL -40°C to +125°C MAX6954ATL+ -40°C to +125°C + Denotes a lead-free/RoHS-compliant package Exposed pad. Pin Configurations and Typical Operating Circuits appear at end of data sheet ...

Page 2

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan ABSOLUTE MAXIMUM RATINGS (Voltage with respect to GND.) V+ .........................................................................-0.3V to +6V All Other Pins............................................-0.3V to (V+ + 0.3V) Current O0–O7 Sink Current ......................................................935mA O0–O18 Source ...

Page 3

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan DC ELECTRICAL CHARACTERISTICS (continued) ( Typical Operating Circuits , V+ = 2.7V to 5.5V, T PARAMETER SYMBOL Segment Drive Source Current ΔI Segment Current Slew Rate ...

Page 4

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan TIMING CHARACTERISTICS ( Typical Operating Circuits , V+ = 2.7V to 5.5V, T PARAMETER TIMING CHARACTERISTICS CLK Clock Period CLK Pulse Width High CLK Pulse Width ...

Page 5

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan (V+ = 3.3V, LED forward voltage = 2.4V, typical application circuit, T DEAD CLOCK OSCILLATOR FREQUENCY vs. SUPPLY VOLTAGE 110 R = 56kΩ SET OSC = ...

Page 6

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan PIN NAME SSOP PDIP 36, 37, P0–P4 34, 35, 36 38, 39, 40 33, 34, 35 ...

Page 7

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan 1dp 1d Figure 1. Segment Labeling for 7-Segment Display, 14-Segment Display, and 16-Segment Display Table 1. MAX6954 Drive ...

Page 8

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 2. Connection Scheme for Eight 16-Segment Digits DIGIT CCO — — CC1 ...

Page 9

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan DOUT CLK MICROCONTROLLER CS DIN Figure 2. MAX6954 Daisy-Chain Connection CS CLK DIN DOUT Figure 3. Timing Diagram to read. Bits contain dummy ...

Page 10

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan CS CLK D15 D14 D13 DIN D12 DOUT Figure 4. Transmission of 16 Bits to the MAX6954 CS CLK N-15 N-14 BIT BIT DIN 1 2 ...

Page 11

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan A logic high selects hexadecimal decoding, while a logic low bypasses the decoder. When direct control is selected, the data bits correspond to ...

Page 12

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Scan-Limit Register The scan-limit register sets how many 14-segment dig- its or 16-segment digits or pairs of 7-segment digits are displayed, from ...

Page 13

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 6. Register Address Map REGISTER No-Op Decode Mode Global Intensity Scan Limit Configuration GPIO Data Port Configuration Display Test Write KEY_A Mask Read KEY_A Debounce ...

Page 14

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 6. Register Address Map (continued) REGISTER Digit 4a Plane P0 (7 Segment Only) Digit 5a Plane P0 (7 Segment Only) Digit 6a Plane P0 (7 ...

Page 15

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 6. Register Address Map (continued) REGISTER Write Digit 2a Planes P0 and P1 with Same Data (7 Segment Only), Reads as 0x00 Write Digit 3a ...

Page 16

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan 200μs DIGIT 0 DIGIT 0 CATHODE DRIVER INTENSITY SETTINGS 1/16TH HIGH-Z (MIN ON) 2/16TH LOW 3/16TH LOW 4/16TH LOW 5/16TH LOW 6/16TH LOW 7/16TH LOW 8/16TH ...

Page 17

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan LED OUTPUT O0 LED OUTPUT O1 LED OUTPUT O2 LED OUTPUT O3 LED OUTPUT O4 LED OUTPUT O5 LED OUTPUT O6 LED OUTPUT ...

Page 18

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan The bit is cleared if the switch has not been detected as pressed by the key-scanning circuit during the last test. Reading a pressed register does ...

Page 19

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan peak current I , plus the 0.8V headroom required by SEG the driver output stages. The MAX6954 correctly regu- lates I with a supply voltage above ...

Page 20

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 7. 16-Segment Display Font Map MSB x000 x001 x010 x011 x100 LSB 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 ...

Page 21

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 9. Digit Plane Data Register Format MODE 14-segment or 16-segment mode, writing digit data to use font map data with decimal place unlit 14-segment or ...

Page 22

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 11. 7-Segment Segment Mapping Decoder for Hexadecimal Font 7-SEGMENT CHARACTER D6, D5, D7 — — — — ...

Page 23

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 13. Example Configurations for Display Digit Combinations DIGIT-TYPE REGISTER SETTING Digits are 16-segment or 7- segment digits. Digit 14-segment ...

Page 24

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 15. Initial Power-Up Register Status POWER-UP REGISTER CONDITION Decode Mode Decode mode enabled Global Intensity 1/16 (min on) Scan Limit Display 8 digits ...

Page 25

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 16. Configuration Register Format REGISTER DATA MODE Configuration Register Table 18. Blink Rate Selection (B Data Bit ...

Page 26

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 23. Global Intensity (I Data Bit D6) Format MODE Intensity for all digits is controlled by one setting in the global intensity register. Intensity for ...

Page 27

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 27. Individual Segment Intensity Registers REGISTER ADDRESS FUNCTION CODE (HEX) Intensity10 Register 0x10 Intensity32 Register 0x11 Intensity54 Register 0x12 Intensity76 Register 0x13 Intensity10a Register 0x14 ...

Page 28

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 29. Odd Individual Segment Intensity Format TYPICAL DUTY SEGMENT CYCLE CURRENT (mA) 1/16 (min on) 2.5 2/16 5 3/16 7.5 4/16 10 5/16 12.5 6/16 ...

Page 29

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 32. Port Configuration Register Format ADDRESS MODE CODE (HEX) GPIO 0x06 Configuration Register PORT ALLOCATION OPTIONS 0 Keys Scanned 0x06 8 Keys Scanned 0x06 16 ...

Page 30

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 34. Key Debounced Register Format KEY ADDRESS DEBOUNCED CODE REGISTER (HEX) D7 Key_A Debounced 0x88 SW_A7 Register Key_B Debounced 0x89 SW_B7 Register Key_C Debounced 0x8A ...

Page 31

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 37. Slot 1 Configuration ...

Page 32

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 38. Slot 2 Configuration ...

Page 33

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 39. Slot 3 Configuration ...

Page 34

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Table 40. Slot 4 Configuration ...

Page 35

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan 3. 47μF 100nF O3 GND GND O4 GND O5 O6 MAX6954 O10 CLK O11 DIN O12 DOUT ...

Page 36

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan 3. 47μF 100nF GND GND GND MAX6954 CLK DIN DOUT CS BLINK OSC_OUT OSC ISET 22pF 56kΩ ...

Page 37

... Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan TOP VIEW DOUT 4 33 OSC_OUT CLK 5 32 BLINK DIN 6 31 O18 7 30 O17 O16 O15 MAX6954AAX O14 O13 O12 O11 O10 GND ISET 17 20 OSC GND SSOP ______________________________________________________________________________________ 1 ...

Page 38

Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE 36 SSOP A36-2 40 PDIP P40-2 40 TQFN ...

Page 39

... 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 ____________________ 39 © 2009 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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