ICM7228DIJI - 8-Digit LED Display Decoder Driver, PDIP-28 | Harris
MPN： ICM7228DIJI ✗ 停產ICM7228DIJI 概覽
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.
直接替換替代品，適用於 ICM7228DIJI — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ICM7228DIJI （相同外形與佔位） — 差異在於 Display Type, Interface, Package, Mounting Type, Decoder Type.
ICM7228AIJI
✅ 直接替換📋 參考替代品（不在目錄中）
ICM7228BIJI
✅ 直接替換📋 參考替代品（不在目錄中）
ICM7228CIJI
✅ 直接替換📋 參考替代品（不在目錄中）
ICM7228AIPIZ
✅ 直接替換聯絡詢價
查看資料表 →ICM7228BIPI
✅ 直接替換聯絡詢價
查看資料表 →ICM7228DIJI 最大額定值與電氣特性
| 功能 | 8-digit, microprocessor-compatible LED display decoder driver |
| Number of Digits | 8 |
| Display Type | 7-segment numeric LED (common anode or common cathode) |
| 介面 | 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 |
| 工作溫度 | -40C to +85C (industrial) |
| 封裝 | 28-pin PDIP (J) |
| 安裝類型 | Through-hole |
| RoHS 狀態 | Non-compliant (PDIP, SnPb lead finish typical) |
ICM7228DIJI 腳位配置
| 腳位 1 | OSC — Oscillator timing component connection |
| 腳位 2 | OSC — Oscillator timing component connection |
| 腳位 3 | DIGIT 8 — Digit driver output 8 |
| 腳位 4 | DIGIT 7 — Digit driver output 7 |
| 腳位 5 | DIGIT 6 — Digit driver output 6 |
| 腳位 6 | DIGIT 5 — Digit driver output 5 |
| 腳位 7 | DIGIT 4 — Digit driver output 4 |
| 腳位 8 | DIGIT 3 — Digit driver output 3 |
| 腳位 9 | DIGIT 2 — Digit driver output 2 |
| 腳位 10 | DIGIT 1 — Digit driver output 1 |
| 腳位 11 | GND — Ground |
| 腳位 12 | VDD — Positive supply |
| 腳位 13 | SEGa — Segment a driver |
| 腳位 14 | SEGb — Segment b driver |
| 腳位 15 | SEGc — Segment c driver |
| 腳位 16 | SEGd — Segment d driver |
| 腳位 17 | SEGe — Segment e driver |
| 腳位 18 | SEGf — Segment f driver |
| 腳位 19 | SEGg — Segment g driver |
| 腳位 20 | SEGdp — Decimal-point segment driver |
| 腳位 21 | INTENSITY — Segment current / brightness control |
| 腳位 22 | MODE — Hex/BCD decoder mode select |
| 腳位 23 | CS — Chip-select (active low) |
| 腳位 24 | WR — Write strobe |
| 腳位 25 | RD — Read strobe |
| 腳位 26 | D0 — Data bit 0 |
| 腳位 27 | D1 — Data bit 1 |
| 腳位 28 | D2 — Data bit 2 |
典型應用
ICM7228DIJI 適用於 6 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 ICM7228DIJI — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Parallel 8-bit microprocessor interface simplifies firmware (對比MAX6954 (I2C/SPI))
- Through-hole PDIP package supports legacy through-hole designs (對比MAX6954 / TM1637 (SMD only))
- On-chip 8 x 8 RAM enables partial display updates (對比ICM7218 (serial interface, 8-digit LED driver))
設計說明
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).
合規資訊
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.
