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8-Digit, Microprocessor-Compatible, LED

Display Decoder Driver

The Intersil ICM7228 display driver interfaces

microprocessors to an 8-digit, 7-segment, numeric LED

display. Included on chip are two types of 7-segment

decoder, multiplex scan circuitry, LED display segment

drivers, LED display digit drivers and an 8-byte static

memory as display RAM.

Data can be written to the ICM7228A and ICM7228B’s display

RAM in sequential 8-digit update or in single-digit update

format. Data is written to the ICM7228C display RAM in parallel

random access format. The ICM7228A and ICM7228C drive

common anode displays. The ICM7228B drives common

cathode displays. All versions can display the RAM data as

either Hexadecimal or Code B format. The ICM7228A and

ICM7228B incorporate a No Decode mode allowing each bit of

each digit's RAM word to drive individual display segments

resulting in independent control of all display segments. As a

result, bargraph and other irregular display segments and

formats can be driven directly by this chip.

The Intersil ICM7228 is an alternative to both the Maxim

ICM7218 and the Intersil ICM7218 display drivers. Notice that

the ICM7228A/B has an additional single digit access mode.

This could make the Intersil ICM7218A/B software incompatible

with ICM7228A/B operation.

Features

• Pb-Free Plus Anneal Available (RoHS Compliant)

• Improved 2nd Source to Maxim ICM7218

• Fast Write Access Time of 200ns

• Multiple Microprocessor Compatible Versions

• Hexadecimal, Code B and No Decode Modes

• Individual Segment Control with “No Decode” Feature

• Digit and Segment Drivers On-Chip

• Non-Overlapping Digits Drive

• Common Anode and Common Cathode LED Versions

• Low Power CMOS Architecture

• Single 5V Supply

Applications

• Instrumentation

• Test Equipment

• Hand Held Instruments

• Bargraph Displays

• Numeric and Non-Numeric Panel Displays

• High and Low Temperature Environments where LCD

Display Integrity is Compromised

Ordering Information

PART NUMBER PART MARKING

DATA ENTRY

PROTOCOL DISPLAY TYPE

TEMP. RANGE

(

C) PACKAGE PKG. DWG. #

ICM7228AIBI ICM7228AIBI Sequential Common Anode -40 to 85 28 Ld SOIC M28.3

ICM7228AIBIZ (Note) 7228AIBIZ Sequential Common Anode -40 to 85 28 Ld SOIC (Pb-free) M28.3

ICM7228AIPI ICM7228AIPI Sequential Common Anode -40 to 85 28 Ld PDIP E28.6

ICM7228AIPIZ (Note) ICM7228AIPI Sequential Common Anode -40 to 85 28 Ld PDIP* (Pb-free) E28.6

ICM7228BIBI ICM7228BIBI Sequential Common Cathode -40 to 85 28 Ld SOlC M28.3

ICM7228BIBIZ (Note) ICM7228BIBIZ Sequential Common Cathode -40 to 85 28 Ld SOlC (Pb-free) M28.3

ICM7228BIPI ICM7228BIPI Sequential Common Cathode -40 to 85 28 Ld PDIP E28.6

ICM7228BIPIZ (Note) ICM7228BIPIZ Sequential Common Cathode -40 to 85 28 Ld PDIP (Pb-free) E28.6

ICM7228CIBI ICM7228CIBI Random Common Anode -40 to 85 28 Ld SOlC M28.3

ICM7228CIBIZ (Note) ICM7228CIBIZ Random Common Anode -40 to 85 28 Ld SOlC (Pb-free) M28.3

ICM7228CIPI ICM7228CIPI Random Common Anode -40 to 85 28 Ld PDIP E28.6

ICM7228CIPIZ (Note) ICM7228CIPI Random Common Anode -40 to 85 28 Ld PDIP (Pb-free) E28.6

*Pb-free PDIPs can be used for through hole wave solder processing only. They are not intended for use in Reflow solder processing applications.

NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin

plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are

MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

FN3160.8Data Sheet December 6, 2005

ICM7228

Summary of content (18 pages)

PAGE 1
ICM7228 ® Data Sheet December 6, 2005 8-Digit, Microprocessor-Compatible, LED Display Decoder Driver FN3160.8 Features • Pb-Free Plus Anneal Available (RoHS Compliant) The Intersil ICM7228 display driver interfaces microprocessors to an 8-digit, 7-segment, numeric LED display. Included on chip are two types of 7-segment decoder, multiplex scan circuitry, LED display segment drivers, LED display digit drivers and an 8-byte static memory as display RAM.
PAGE 2
ICM7228 Pinouts ICM7228B (PDIP, SOIC) COMMON CATHODE TOP VIEW ICM7228A (PDIP, SOIC) COMMON ANODE TOP VIEW SEG c 1 28 VSS DIGIT 4 1 28 VSS SEG e 2 27 SEG a DIGIT 6 2 27 DIGIT 7 SEG b 3 26 SEG g DIGIT 3 3 26 DIGIT 5 DP 4 25 SEG d DIGIT 1 4 25 DIGIT 2 ID6 (HEXA/CODE B) 5 24 SEG f ID6 (HEXA/CODE B) 5 24 DIGIT 8 ID5 (DECODE) 6 23 DIGIT 3 ID5 (DECODE) 6 23 SEG g ID7 (DATA COMING) 7 22 DIGIT 6 ID7 (DATA COMING) 7 22 SEG f WRITE 8 21 DIGIT 7 WRITE 8 21 SEG e MODE 9 20 DIGIT 4 MOD
PAGE 3
ICM7228 Functional Block Diagram ICM7228A, ICM7228B ID0 - ID7 INPUT DATA 8 8 ICM7228C ID4 - ID7 CONTROL INPUTS MODE 1 4 DA0 - DA2 ID0 - ID3 ID7 DIGIT DATA INPUT WRITE ADDRESS 5 1 3 HEXADECIMAL/ CODE B/ SHUTDOWN WRITE 1 1 DECODE SHUTDOWN CONTROL LOGIC HEXA/CODE B 1 1 1 8 8-BYTE STATIC RAM 8 1 SHUTDOWN 1 WRITE ADDRESS COUNTER 8 8-BYTE STATIC RAM 1 THREE LEVEL INPUT LOGIC 1 WRITE ADDRESS COUNTER 8 7 8 4 HEXADECIMAL/ CODE B DECODER READ ADDRESS, DIGIT MULTIPLEXER READ ADDRESS MULT
PAGE 4
ICM7228 Absolute Maximum Ratings Thermal Information Supply Voltage (VDD - VSS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6V Digit Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mA Segment Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100mA Input Voltage (Note 1) (Any Terminal) . . (VSS -0.3V)
PAGE 5
ICM7228 Electrical Specifications VDD = +5.0V ±10%, VSS = 0V, Unless Otherwise Specified (Continued) TA = 25oC MIN TYP MAX MIN TYP MAX UNITS All Inputs Except Pin 9, ICM7228C, VIN = VSS - - 1 - - 1 µA All Inputs Except Pin 9, ICM7228C, VIN = 5.
PAGE 6
ICM7228 Timing Diagrams MODE tMS tMH WRITE MODE tWH tWL WRITE INPUT DATA CONTROL WORD TYPE OF DECODER?ID6 DECODE/NO DECODE? ID5 SHUTDOWN?ID4 DATA COMING ID7 tDH tDS VALID FIGURE 1. ICM7228A/B WRITE CYCLE DIGIT ADDRESS DAO-DAZ WRITE DATA 8 PULSES (D1) VALID tAS tAH tWL tWH tDH tDS DATA VALID DATA FIGURE 3. ICM7228C WRITE CYCLE 10µs (TYP) FREE RUNNING 320µs (TYP) FREE RUNNING (PER DIGIT) INTERDIGIT BLANKING INTERNAL SIGNAL D2 D5 INTERDIGIT BLANKING D1 D7 D8 D6 D4 D3 FIGURE 4.
PAGE 7
ICM7228 Typical Performance Curves 0 -55oC 100 125oC 25oC 300 ISEG (mA) IDIG (mA) -55oC 80 200 25oC 125oC 25oC 60 125oC 40 400 20 500 -55oC 0 5.0 4.0 3.0 2.0 1.0 0 0 1.0 2.0 3.0 4.0 5.0 VSEG (V) VDD-VDIG (V) FIGURE 5. COMMON ANODE DIGIT DRIVER IDIG vs (VDD - VDIG) FIGURE 6. COMMON ANODE SEGMENT DRIVER ISEG vs VSEG 25oC -55oC 0 10 125oC ISEG (mA) IDIG (mA) 20 300 -55oC 200 25oC 125oC 100 30 40 50 0 0 1.0 2.0 3.0 4.0 5.0 5.0 4.0 3.0 2.0 1.
PAGE 8
ICM7228 TABLE 1. ICM7228A PIN ASSIGNMENTS AND DESCRIPTIONS (Continued) PIN NO. NAME FUNCTION DESCRIPTION 9 MODE Input Selects Data to Be Loaded to Control Register or Display RAM: High, Loads Control Register; Low, Loads Display RAM. 10 ID4, (SHUTDOWN) Input When “MODE” Low: Display Data Input, Bit 5. When “MODE” High: Control Bit, Low Power Mode Select: High, Normal Operation; Low, Oscillator and Display Disabled. 11 ID1 Input When “MODE” Low: Display Data Input, Bit 2.
PAGE 9
ICM7228 TABLE 2. ICM7228B PIN ASSIGNMENTS AND DESCRIPTIONS (Continued) PIN NO. NAME FUNCTION DESCRIPTION 8 WRITE Input Data Input Will Be Written to Control Register or Display RAM on Rising Edge of WRITE. 9 MODE Input Selects Data to Be Loaded to Control Register or Display RAM: High, Loads Control Register; Low, Loads Display RAM. 10 ID4, (SHUTDOWN) Input When “MODE” Low: Display Data Input, Bit 5.
PAGE 10
ICM7228 TABLE 3. ICM7228C PIN ASSIGNMENTS AND DESCRIPTIONS (Continued) PIN NO. NAME FUNCTION DESCRIPTION 9 HEXA/CODE B/SHUTDOWN Input Three Level Input. Display Function Control: High, Hexadecimal Decoding; Float, Code B Decoding; Low, Oscillator, and Display Disabled. 10 DA2 Input Digit Address Input, Bit 3, MSB. 11 ID1 Input Display Data Inputs. 12 ID0 13 ID2 14 ID3 15 DIGIT 1 16 DlGlT 2 17 DIGIT 5 18 DlGlT 8 19 Output LED Display Digits 1, 2, 5 and 8 Drive Lines.
PAGE 11
ICM7228 Sequential 8-Digit Update Single Digit Update The logic state of DATA COMING (lD7) is also latched during a Control Register update. If the latched value of DATA COMING (lD7) is high, the display becomes blanked and a sequential 8-digit update is initiated. Display data can now be written into RAM with 8 successive WRITE pulses, starting with digit 1 and ending with digit 8 (See Figure 2). After all 8 RAM locations have been written to, the display turns on again and the new data is displayed.
PAGE 12
ICM7228 Display Formats TABLE 5. DISPLAY CHARACTER SETS (Continued) The ICM7228A and ICM7228B have three possible display formats; Hexadecimal, Code B and No Decode. Table 5 shows the character sets for the decode modes and their corresponding input code. INPUT DATA CODE The display formats of the ICM7228A/B are selected by writing data to bits ID4, ID5 and ID6 of the Control Register (See Table 1 and 2 for input Definitions).
PAGE 13
ICM7228 entered when in the shutdown mode. Data is retained in memory even with the supply voltage as low as 2V. The ICM7228A/B is shutdown by writing a control word with Shutdown (lD4) low. The ICM7228C is put into shutdown mode by driving pin 9, HEXA/CODE B/SHUTDOWN, low. The ICM7228 operating current with the display blanked is within 100µA - 200µA for all versions. All versions of the ICM7228 can be blanked by writing Hex FF to all digits and selecting Code B format.
PAGE 14
ICM7228 VDD VDD VDD P ≈2kΩ SEGMENT DATA INTERDIGIT BLANKING N ≈75Ω SHUTDOWN COMMON ANODE SEGMENT OUTPUT UP TO 4A DIGIT OUTPUT ICM7228A/C VSS VDD VDD FIGURE 12B. SEGMENT DRIVER SEGMENT OUTPUT FIGURE 12. COMMON ANODE DISPLAY DRIVERS 10K VDD P ≈2kΩ DIGIT STROBE INTERDIGIT BLANKING N ≈15Ω SHUTDOWN VSS COMMON CATHODE DIGIT OUTPUT VSS FIGURE 14. DRIVING HIGH CURRENT DISPLAY, COMMON ANODE ICM7228A/C TO COMMON ANODE VDD VDD VSS SEGMENT OUTPUT 100Ω FIGURE 13A.
PAGE 15
ICM7228 Power Supply Bypassing VDD VDD VDD Connect a minimum of 47µF in parallel with 0.1µF capacitors between VDD and VSS of ICM7228. These capacitors should be placed in close proximity to the device to reduce the power supply ripple caused by the multiplexed LED display drive current pulses. 1.4APEAK 1K 2N6034 100Ω SEGMENT OUTPUT ICM7228B VDD DIGIT OUTPUT 1K 300Ω 25Ω (100mAPEAK) 2N2219 N ≈15Ω 1K VSS VSS FIGURE 16.
PAGE 16
ICM7228 Test Circuit ID6 (HEXA/CODE B) ID5 (DECODE) ID7 (DATA COMING) WRITE MODE ID4 (SHUTDOWN) ID1 ID0 ID2 ID3 VDD 1 28 2 27 3 26 4 25 5 24 6 23 22 7 ICM7228A 8 21 9 20 10 19 11 18 12 17 13 16 14 15 f VDD + d 47µF +0.1µF 5V VSS g a VSS D8 D7 D6 D5 D4 COMMON ANODE DISPLAY D3 D2 D1 c e b DP FIGURE 18.
PAGE 17
ICM7228 Dual-In-Line Plastic Packages (PDIP) E28.6 (JEDEC MS-011-AB ISSUE B) N 28 LEAD DUAL-IN-LINE PLASTIC PACKAGE E1 INDEX AREA 1 2 3 INCHES N/2 SYMBOL -B- -C- A2 SEATING PLANE e B1 D1 A1 eC B 0.010 (0.25) M C A B S MAX NOTES - 0.250 - 6.35 4 0.015 - 0.39 - 4 A2 0.125 0.195 3.18 4.95 - B 0.014 0.022 0.356 0.558 - C L B1 0.030 0.070 0.77 1.77 8 eA C 0.008 0.015 0.204 0.381 - D 1.380 1.565 D1 0.
PAGE 18
ICM7228 Small Outline Plastic Packages (SOIC) M28.3 (JEDEC MS-013-AE ISSUE C) N 28 LEAD WIDE BODY SMALL OUTLINE PLASTIC PACKAGE INDEX AREA H 0.25(0.010) M B M INCHES E SYMBOL -B- 1 2 3 L SEATING PLANE -A- h x 45o A D -C- e A1 B C 0.10(0.004) 0.25(0.010) M C A M B S MILLIMETERS MIN MAX NOTES A 0.0926 0.1043 2.35 2.65 - 0.0040 0.0118 0.10 0.30 - B 0.013 0.0200 0.33 0.51 9 C 0.0091 0.0125 0.23 0.32 - D 0.6969 0.7125 17.70 18.10 3 E 0.2914 0.2992 7.