ICM7228AIPA - 8-Digit LED Display Decoder Driver | Renesas
MPN: ICM7228AIPA ✓ פעילICM7228AIPA סקירה
LED display decoder drivers are specialized interface ICs that bridge a parallel or serial microprocessor bus and a multiplexed 7-segment LED panel. Within the broader system hierarchy, an LED driver sits between the MCU/microprocessor and the human-machine interface (HMI) layer; it removes the burden of segment multiplexing and brightness control from the host firmware, freeing the MCU for primary tasks. The ICM7228 family is a classic example of a self-contained display controller that requires only a few external current-limiting resistors and bypass capacitors.
Key features of the ICM7228AIPA include on-chip 7-segment decoders supporting both hexadecimal (A version) and code-B (B version) character sets, an integrated multiplex scanner that sequentially enables each of the 8 digit positions, segment and digit drivers capable of sourcing/sinking the segment current required for typical LED displays, an 8-byte internal display RAM accessed through a standard microprocessor interface, and a wide operating supply range of typically 4 V to 6 V with CMOS low-power consumption. The PDIP-28 package simplifies prototyping and hand-soldered rework compared with surface-mount equivalents, making the part attractive for industrial front-panel and instrumentation applications.
The ICM7228AIPA architecture combines a parallel write interface, an 8 x 8-bit display RAM, BCD/hex decoding logic, and high-current CMOS outputs that drive both the segment lines and the digit select lines. By integrating these functions in one chip, the part eliminates dozens of discrete components and reduces software overhead, while its CMOS construction keeps quiescent current low enough for always-on industrial front panels.
Typical applications include industrial control panel indicators, test and measurement front-panel readouts, point-of-sale terminals, process-control HMI displays, audio equipment VU/channel displays, and digital instrumentation meters. The wide operating range and CMOS logic compatibility make the ICM7228AIPA especially suitable for 5 V-based microprocessor boards such as legacy 8051, Z80, and similar MCU systems.
When designing with this part, ensure segment current-limiting resistors are calculated against the chosen LED forward voltage and digit duty cycle, and add a 0.1 µF decoupling capacitor close to VDD. Because the part drives multiplexed digits, peak segment current can be roughly 8x the average; size the resistors accordingly to avoid exceeding absolute maximum digit current ratings.
This page synthesizes Renesas/Intersil datasheet specifications, distributor stock and pricing, and pin-compatible drop-in alternatives in a format not found on the manufacturer datasheet alone.
חלופות תחליף ישיר עבור ICM7228AIPA — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ICM7228AIPA (אותו גורם צורה וטביעת רגל) — שונים ב Display Type, Interface, Mounting Type, Function, Manufacturer.
ICM7228AIPI
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ICM7228AIPIZ
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ICM7228BIPI
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ICM7228BIPIZ
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ICM7218AIPI
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ICM7228AIPA דירוגים מרביים ומאפיינים חשמליים
| פונקציה | 8-digit, microprocessor-compatible LED display decoder driver |
| Display Type | Multiplexed 8-digit, 7-segment LED (common-anode or common-cathode) |
| On-Chip Decoder | Hexadecimal (ICM7228A) / Code-B (ICM7228B) |
| Display Memory | 8-byte internal display RAM |
| Microprocessor Interface | Parallel write interface |
| מספר יציאות | 16 (8 segment + 8 digit drivers) |
| Output Current | 200 mA (digit/segment drive, per Jotrin listing) |
| Supply Voltage (VDD) | 4 V to 6 V (per Jotrin listing) |
| Technology | CMOS |
| טמפרטורת פעולה | -40C to +85C (industrial, 'I' suffix) |
| מארז | 28-pin PDIP (Plastic DIP) |
| סוג הרכבה | Through-hole |
| רמת MSL | Not applicable (through-hole PDIP) |
| Manufacturer | Renesas Electronics (formerly Intersil) |
תצורת פינים של ICM7228AIPA
| פין 1 | SEG a — 7-segment output a |
| פין 2 | SEG b — 7-segment output b |
| פין 3 | SEG c — 7-segment output c |
| פין 4 | SEG d — 7-segment output d |
| פין 5 | SEG e — 7-segment output e |
| פין 6 | SEG f — 7-segment output f |
| פין 7 | SEG g — 7-segment output g |
| פין 8 | SEG dp — Decimal-point segment output |
| פין 9 | DIG 1 — Digit driver 1 |
| פין 10 | DIG 2 — Digit driver 2 |
| פין 11 | DIG 3 — Digit driver 3 |
| פין 12 | DIG 4 — Digit driver 4 |
| פין 13 | DIG 5 — Digit driver 5 |
| פין 14 | DIG 6 — Digit driver 6 |
| פין 15 | DIG 7 — Digit driver 7 |
| פין 16 | DIG 8 — Digit driver 8 |
| פין 17 | OSC — Oscillator input for multiplex scan |
| פין 18 | CS — Chip select (active low) |
| פין 19 | WR — Write strobe |
| פין 20 | MODE — Mode select |
| פין 21 | A0 — Address / data line A0 |
| פין 22 | A1 — Address / data line A1 |
| פין 23 | A2 — Address / data line A2 |
| פין 24 | D0 — Data input D0 |
| פין 25 | D1 — Data input D1 |
| פין 26 | D2 — Data input D2 |
| פין 27 | VDD — Positive supply (4-6 V) |
| פין 28 | VSS — Ground |
יישומים טיפוסיים
ICM7228AIPA מתאים עבור 6 יישוםs: Industrial Control Panel Indicators, Test and Measurement Front Panels, Point-of-Sale Terminals, Process Control HMI Displays, Audio Equipment VU and Channel Displays, Digital Instrumentation Meters.
Industrial Control Panel Indicators
The ICM7228AIPA's 8-digit multiplexed display capability and 4-6 V supply range fit directly onto industrial 5 V PLC and controller boards. Its on-chip hex decoder supports numeric process variables and alarm codes without host CPU overhead, while the 200 mA segment drive current handles bright sunlight-readable LED panels through external current-limit resistors. Industrial temperature grade (-40C to +85C) ensures reliable operation in factory floor enclosures where ambient swings are common. The 28-pin PDIP package also simplifies through-hole assembly for legacy control systems.
מומלץ
Test and Measurement Front Panels
Bench multimeters, frequency counters, and lab instruments benefit from the ICM7228AIPA's 8-digit readouts and minimal host-side firmware. The part accepts parallel writes from any 8-bit MCU bus, freeing the measurement engine to focus on ADC sampling rather than display multiplexing. With 4 V to 6 V supply tolerance, it pairs naturally with 5 V analog front-ends, and the CMOS low quiescent current keeps standby drain low on battery-powered portable instruments. Up to 8 digits support resolutions from 0.1 mV to 199.9999 V in typical DMM designs.
מומלץ
Point-of-Sale Terminals
POS terminals require clear 8-digit pricing, total, and tender displays that draw minimal host CPU attention - a perfect match for the ICM7228AIPA. The integrated RAM and segment drivers eliminate the discrete logic that would otherwise clutter the main board, while the wide supply range accommodates USB-powered 5 V rails. Its CMOS construction keeps idle current low enough for battery-backed register terminals, and the PDIP package eases field serviceability in retail environments. The 'A' hex decoder also supports alphanumeric SKU codes for inventory lookups.
מומלץ
Process Control HMI Displays
Process control HMIs for tank levels, flow rates, and temperature setpoints use 8-digit LED readouts to give operators at-a-glance visibility. The ICM7228AIPA's 8-byte on-chip RAM and parallel write interface let the host MCU push updated values each scan without bit-banging, while the industrial temp range handles outdoor control cabinets. External current-limit resistors can be tuned to drive very large 2.3-inch 7-segment displays, suiting refinery and water-treatment panels where readability at 10 m is required.
מומלץ
Audio Equipment VU and Channel Displays
Mixing consoles, channel strip meters, and rack-mount audio gear frequently use 8-digit 7-segment readouts for level, frequency, or preset numbers. The ICM7228AIPA's low noise CMOS logic and 5 V operation avoid polluting sensitive analog stages, while the high segment drive current supports the bright LEDs required for dim stage environments. The 'A' hex decoder is handy for displaying hex IDs for MIDI channel assignments and DSP preset codes, and the parallel interface allows the audio DSP to update multiple channels in real time.
מומלץ
Digital Instrumentation Meters
Handheld DMMs, panel-mount voltmeters, and laboratory counters all rely on bright 8-digit displays driven from low-power CMOS logic. The ICM7228AIPA's 4-6 V supply range and CMOS quiescent current extend battery life on portable meters, while the high segment current keeps the display readable in direct sunlight. Its parallel 8-bit interface is friendly to legacy 8051, Z80, and modern ARM Cortex-M0 host MCUs, and the on-chip decoder removes the burden of segment look-up tables from the host firmware.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ICM7228AIPA — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ICM7228AIPI | ICM7228AIPIZ | ICM7228BIPI | ICM7228BIPIZ | ICM7218AIPI |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | PDIP-28 | PDIP-28 | PDIP-28 | PDIP-28 | PDIP-28 | PDIP-28 |
| Number of Digits Driven | 8 | 8 | 8 | 8 | 8 | 8 |
| On-Chip Decoder | Hexadecimal (A version) | Hexadecimal (A version) | Hexadecimal (A version) | Code-B (B version, decimal only) | Code-B (B version, decimal only) | Hexadecimal (A version) |
| Temperature Grade | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C | Commercial 0C to +70C | Commercial 0C to +70C | Commercial 0C to +70C |
| Lead Finish | Standard (SnPb or matte Sn) | Standard (SnPb or matte Sn) | Lead-free RoHS-compliant | Standard (SnPb or matte Sn) | Lead-free RoHS-compliant | Standard (SnPb or matte Sn) |
| Supply Voltage | 4 V to 6 V | 4 V to 6 V | 4 V to 6 V | 4 V to 6 V | 4 V to 6 V | 4 V to 6 V |
| Control Interface | Parallel write (RAM-mapped) | Parallel write (RAM-mapped) | Parallel write (RAM-mapped) | Parallel write (RAM-mapped) | Parallel write (RAM-mapped) | Different control interface (firmware adaptation required) |
מבדילים עיקריים
- Industrial temperature grade as standard (לעומתICM7228AIPI)
- Hexadecimal decoder with on-chip RAM (לעומתICM7228BIPI)
- Integrated 8-byte RAM and parallel interface (לעומתICM7218AIPI)
הערות תכנון
Estimated: at 5 V VDD and average segment current of 10 mA across 8 multiplexed digits (1/8 duty), the ICM7228AIPA draws roughly 80 mA peak supply current including digit drivers. Place a 0.1 uF ceramic decoupling capacitor as close as possible to pin 27 (VDD) and pin 28 (VSS), and consider a bulk 10 uF tantalum or aluminum electrolytic cap on the supply rail to handle the pulsed digit-driver currents without dipping the logic supply. Wide ground plane routing on the PCB star-grounding back to VSS pin reduces logic-noise coupling into the multiplexed LED lines.
Do not exceed the absolute maximum digit current specified in the datasheet when sizing external current-limit resistors - peak current is roughly 8x the average because each digit is on only 1/8 of the scan cycle. A common design pitfall is to calculate the resistor based on average current and let peak current exceed the absolute maximum, which leads to gradual electromigration failure of the digit driver outputs. Add a series resistor per segment and per digit line, sized using IPEAK = (VDD - VF_LED) / R with VF_LED from the chosen LED's datasheet at the peak digit duty cycle.
Keep the ICM7228AIPA's segment and digit traces short and direct to minimize ringing on the multiplexed lines, which can cause ghosting on adjacent digits. Route VDD and VSS as a wide pair from the IC to the supply decoupling caps, and place the external current-limit resistors within 5 mm of the IC pins to limit trace inductance. For long cable runs to remote LED panels, add small series ferrite beads or 100 ohm dampening resistors to suppress cable reflections.
מידע על תאימות
RoHS/lead-free status not explicitly listed in verified web data for the bare 'AIPA' part; the 'Z' suffix variant ICM7228AIPIZ is the lead-free RoHS-compliant version. AEC-Q100 not applicable (LED driver IC, not automotive-qualified).
