ICM7228DIJI - 8-Digit LED Display Decoder Driver, PDIP-28 | Harris
MPN: ICM7228DIJI ✗ Akhir HidupICM7228DIJI Ringkasan
An LED display driver is a specialized interface IC that bridges a digital controller (typically a microcontroller or microprocessor) and a multiplexed numeric display. It performs BCD/hex-to-7-segment decoding, time-multiplexes multiple digits onto shared segment lines, and provides the high-current drive transistors needed to bias each LED digit in sequence. These functions sit within the broader hierarchy of display drivers -> display PMIC -> power management IC -> semiconductor, eliminating dozens of discrete logic and driver parts that would otherwise be needed to refresh a multi-digit readout.
Key features of the ICM7228DIJI include a wide 5V supply range with internal segment current regulation, hardware or software intensity control, on-chip multiplex scan oscillator, write-only or read/write memory modes, and segment blanking for leading-zero suppression. The bipolar parallel interface is straightforward to drive from any 8-bit bus, and the multiplexed architecture refreshes up to eight digits with no external switching transistors.
Architecturally, the ICM7228 family uses CMOS logic for the decoder/memory array paired with bipolar high-current drivers in a single die, allowing low quiescent current while still sinking or sourcing tens of milliamps per segment. This hybrid process delivers the noise immunity of CMOS control logic with the robust drive capability required for bright multiplexed LED panels.
Typical applications include test equipment front panels, instrumentation readouts, point-of-sale terminals, industrial process displays, and any microprocessor-controlled numeric display requiring eight or fewer digits of high-visibility output. The DIP package simplifies prototyping and low-volume production.
When designing with this device, observe the absolute-maximum supply and segment-current ratings and provide proper PCB layout that keeps digit-drive returns close to the IC ground. Verify segment current resistor values against the chosen digit duty cycle and supply voltage to achieve the intended brightness without exceeding dissipation.
Alternatif penggantian untuk ICM7228DIJI — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian ICM7228DIJI (sama faktor bentuk dan footprint) — berbeda di dalam Display Type, Interface, Package, Mounting Type, Decoder Type.
ICM7228AIJI
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
ICM7228BIJI
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
ICM7228CIJI
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
ICM7228AIPIZ
✅ Drop-InKontak untuk harga
Lihat Datasheet →ICM7228BIPI
✅ Drop-InKontak untuk harga
Lihat Datasheet →ICM7228DIJI Rating Maksimal & Karakteristik Listrik
| Fungsi | 8-digit, microprocessor-compatible LED display decoder driver |
| Number of Digits | 8 |
| Display Type | 7-segment numeric LED (common anode or common cathode) |
| Antarmuka | Parallel 8-bit microprocessor-compatible |
| On-chip Memory | 8 x 8 static RAM |
| Decoder Type | Two on-chip 7-segment decoders (hex/BCD selectable) |
| Multiplex Circuitry | Internal scan oscillator and digit drivers |
| Segment Drivers | Integrated, internal current regulation |
| Intensity Control | Hardware/software intensity adjustment |
| Blanking | Leading-zero suppression supported |
| Suhu Kerja | -40C to +85C (industrial) |
| Paket | 28-pin PDIP (J) |
| Tipe Mounting | Through-hole |
| Status RoHS | Non-compliant (PDIP, SnPb lead finish typical) |
Konfigurasi Pin ICM7228DIJI
| Pin produk 1 | OSC — Oscillator timing component connection |
| Pin produk 2 | OSC — Oscillator timing component connection |
| Pin produk 3 | DIGIT 8 — Digit driver output 8 |
| Pin produk 4 | DIGIT 7 — Digit driver output 7 |
| Pin produk 5 | DIGIT 6 — Digit driver output 6 |
| Pin produk 6 | DIGIT 5 — Digit driver output 5 |
| Pin produk 7 | DIGIT 4 — Digit driver output 4 |
| Pin produk 8 | DIGIT 3 — Digit driver output 3 |
| Pin produk 9 | DIGIT 2 — Digit driver output 2 |
| Pin produk 10 | DIGIT 1 — Digit driver output 1 |
| Pin produk 11 | GND — Ground |
| Pin produk 12 | VDD — Positive supply |
| Pin produk 13 | SEGa — Segment a driver |
| Pin produk 14 | SEGb — Segment b driver |
| Pin produk 15 | SEGc — Segment c driver |
| Pin produk 16 | SEGd — Segment d driver |
| Pin produk 17 | SEGe — Segment e driver |
| Pin produk 18 | SEGf — Segment f driver |
| Pin produk 19 | SEGg — Segment g driver |
| Pin produk 20 | SEGdp — Decimal-point segment driver |
| Pin produk 21 | INTENSITY — Segment current / brightness control |
| Pin produk 22 | MODE — Hex/BCD decoder mode select |
| Pin produk 23 | CS — Chip-select (active low) |
| Pin produk 24 | WR — Write strobe |
| Pin produk 25 | RD — Read strobe |
| Pin produk 26 | D0 — Data bit 0 |
| Pin produk 27 | D1 — Data bit 1 |
| Pin produk 28 | D2 — Data bit 2 |
Aplikasi Umum
ICM7228DIJI cocok untuk 6 aplikasis: Test Equipment Front-Panel Readout, Industrial Process-Control Displays, Point-of-Sale Terminal Displays, Instrumentation Readouts, Audio Equipment Numeric Displays, Avionics and Aerospace Numeric Panels.
Test Equipment Front-Panel Readout
The ICM7228DIJI drives 8 digits of 7-segment LED readouts on bench instruments such as multimeters, frequency counters and bench power supplies. Its parallel microprocessor interface (D0-D7 plus CS, WR, RD) connects directly to 8051/PIC/AVR GPIO ports with no glue logic. Internal segment current regulation simplifies brightness control, and the 8 x 8 on-chip RAM allows the host to update individual digits without rewriting the whole display. Compared with discrete decoder/driver chains, the single-chip solution reduces PCB area and BOM count while improving reliability of multi-digit readouts.
Direkomendasikan
Industrial Process-Control Displays
Factory-automation HMIs use the ICM7228DIJI to display flow rates, temperatures, pressures and setpoints on large 7-segment panels. The internal multiplex scan oscillator eliminates external timing components; intensity control adjusts brightness for plant-floor visibility. The wide industrial temperature range (-40C to +85C) and PDIP package suit harsh environments where surface-mount components may be impractical for serviceability. Hardware blanking supports leading-zero suppression so process values read naturally.
Direkomendasikan
Point-of-Sale Terminal Displays
POS terminals use the ICM7228DIJI for cashier-side and customer-side price/quantity readouts where high brightness and 8-digit capacity are required. The parallel bus allows fast updates during barcode scans and totals. Bipolar segment drivers source enough current per segment for large common-anode displays, eliminating additional driver transistors. The simple firmware model (write digit, increment address) speeds development on 8-bit microcontrollers common in payment terminals.
Direkomendasikan
Instrumentation Readouts
Laboratory and field instrumentation - spectrum analyzers, environmental monitors, medical diagnostic equipment - use the ICM7228DIJI for high-visibility numeric readouts. The hardware intensity pin supports photo-sensor-driven adaptive dimming in clinical or field use. Internal segment drivers eliminate resistor networks, simplifying calibration of brightness across digits. The on-chip 8 x 8 RAM stores complete display state so the host can update partially without flicker.
Direkomendasikan
Audio Equipment Numeric Displays
Studio audio gear, broadcast mixers and effects units use the ICM7228DIJI for channel-number, preset, time-code or level displays. The parallel interface connects to DSP control ports for fast preset updates. Bipolar segment drivers provide bright, flicker-free readouts in dim studio lighting. On-chip intensity control adapts brightness to darkened rooms while the read/write memory modes allow non-destructive display updates from audio DSP chips.
Direkomendasikan
Avionics and Aerospace Numeric Panels
Avionics subsystems and ground-support equipment historically use the ICM7228DIJI for fuel quantity, altitude, RPM and channel readouts. Its through-hole PDIP package eases field replacement and the industrial temperature range supports harsh cockpit environments. Wide supply tolerance accommodates 5V aircraft buses. Although obsolete, it remains in service for legacy aerospace equipment where drop-in replacements are required to preserve certifications.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk ICM7228DIJI — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | ICM7228AIJI | ICM7228BIJI | ICM7228CIJI | ICM7228AIPIZ | ICM7228BIPI |
|---|---|---|---|---|---|---|
| Package | PDIP-28 | PDIP-28 - same | PDIP-28 - same | PDIP-28 - same | PDIP-28 - same | PDIP-28 - same |
| Brand | Intersil | Intersil | Intersil | Intersil | Intersil | Intersil |
| Digits | 8 | 8 | 8 | 8 | 8 | 8 |
| Interface | Parallel 8-bit | Parallel 8-bit | Parallel 8-bit | Parallel 8-bit | Parallel 8-bit | Parallel 8-bit |
| Decoder Mode | Hex/BCD selectable | Hex (default) | BCD/Code-B | Code-B | Hex (industrial) | BCD/Code-B |
| Display Polarity | Common-anode / cathode selectable | Common-anode/cathode | Common-anode/cathode | Common-anode/cathode | Common-anode/cathode | Common-anode/cathode |
| On-chip RAM | 8 x 8 | 8 x 8 | 8 x 8 | 8 x 8 | 8 x 8 | 8 x 8 |
| Intensity Control | Hardware/software | Hardware/software | Hardware/software | Hardware/software | Hardware/software | Hardware/software |
Diferensiator Kunci
- Parallel 8-bit microprocessor interface simplifies firmware (vsMAX6954 (I2C/SPI))
- Through-hole PDIP package supports legacy through-hole designs (vsMAX6954 / TM1637 (SMD only))
- On-chip 8 x 8 RAM enables partial display updates (vsICM7218 (serial interface, 8-digit LED driver))
Catatan Desain
Estimate total supply current by summing per-segment current (set by the intensity resistor) times the average number of lit segments per digit, multiplied by the inverse of the multiplex duty cycle. For an 8-digit display with 5 mA peak per segment and 1/8 duty, average segment current is ~625 uA. Add digit driver current and logic supply for total IDD. Provide a 0.1 uF decoupling capacitor close to VDD pin.
Route segment and digit driver traces as wide as practical (>=0.5 mm) to minimize voltage drops that cause brightness mismatch between digits. Keep the ground return for LED current separate from the logic ground and join them at a single point near the IC ground pin. Place intensity-control capacitor/resistor close to the relevant pins to avoid oscillator noise coupling into segment lines.
Do not exceed absolute maximum ratings on segment and digit outputs - overcurrent or inductive loads can destroy the bipolar drivers. Always blank leading zeros when displaying numbers to avoid the '00000012' pattern. When migrating from ICM7228DIJI to the A/B/C variants, verify the decoder mode strap pins match your firmware and your display polarity (common-anode vs common-cathode).
Informasi Konformitas
Original Intersil/Harris ICM7228DIJI in PDIP-28 packaging is typically SnPb lead finish and not RoHS compliant. RoHS-compliant variants may exist; consult the manufacturer datasheet and current distributor product pages for up-to-date compliance information.
