ICM7228CIPI - 8-Digit LED Display Decoder Driver, 28-PDIP | Renesas / Intersil
部品番号: ICM7228CIPI ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $4.25 | $4.25 |
| 10 | $3.85 | $38.50 |
| 100 | $3.4 | $340.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.6 | $2,600.00 |
ICM7228CIPI 概要
What is an LED display decoder driver? It is a mixed-signal interface IC that bridges a low-voltage digital processor and a high-current 7-segment vacuum-fluorescent or LED display. Within the power management and display driver category hierarchy, it sits below GPIO expanders and segment drivers, and above simple shift-register based drivers. By integrating multiplex scan, segment decode, and digit drivers on one die, the ICM7228CIPI replaces dozens of discrete components and reduces PCB area in instrument panels, point-of-sale terminals, and digital panel meters.
Key features include hardware BCD/hex digit decoding, an 8-digit common-cathode scan multiplex engine, direct 8-bit parallel microprocessor interface, 5 V single-supply operation, CMOS low-power consumption, and industry-standard 28-pin PDIP packaging. The CMOS process yields very low quiescent current suitable for battery-backed instrument clusters. The 28-pin CMOS package provides 5 mA typical segment sink current, sufficient for standard-brightness 7-segment LED digits without external transistors. Operating temperature range extends from -20 °C to +85 °C for industrial and commercial equipment.
The ICM7228CIPI uses an internal oscillator and counter to sequentially enable each of the 8 digit drivers while the corresponding segment data is latched from the bus. This eliminates CPU-driven refresh overhead and frees the host microcontroller for measurement, communication, or control tasks. The device accepts either BCD or hexadecimal segment codes via configuration pins, supporting both decimal readouts and 0-F hex displays for engineering instruments.
Typical applications include digital panel meters, multimeters, frequency counters, instrumentation readouts, industrial process controllers, point-of-sale terminals, and bench-top test equipment where a numeric-only 7-segment LED readout is required. The 28-PDIP package suits through-hole prototyping and repair of legacy designs. The Intersil ICM7228 is also marketed as a functional alternative to the Maxim ICM7218 display driver family, easing upgrades from older Maxim parts. When designing with this device, ensure the LED digit forward current matches the IC segment drive capability; otherwise, add external transistor buffers per digit. Decoupling the 5 V supply with a 0.1 µF ceramic capacitor placed close to VDD pin is required to prevent logic noise from corrupting the multiplex timing.
ドロップイン代替品: ICM7228CIPI — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ICM7228CIPI （同一形状・フットプリント） — 相違点: Display Type, Interface, Package, Mounting Type, Manufacturer.
クイック比較ツール — 並列比較する代替部品を選択:
ICM7228BIPI
✅ ドロップイン✓ 在庫あり
$9.85 / 個
データシートを見る →ICM7228AIPIZ
✅ ドロップイン✓ 在庫あり
$10.75 / 個
データシートを見る →ICM7218CIPI
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ICM7218BIPI
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ICM7218AIPI
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ICM7228CIPI 仕様
| Device Type | LED Display Decoder Driver |
| Number of Digits | 8 digits |
| Display Type | 7-segment, common-cathode LED |
| Decode Modes | BCD / Hexadecimal (selectable) |
| Technology | CMOS |
| Supply Voltage (VDD) | 5 V |
| 動作温度 | -20 °C to +85 °C |
| インターフェース | 8-bit parallel microprocessor bus |
| Multiplexing | Internal scan, 8-digit sequential |
| パッケージ | 28-pin PDIP (PDIP-28) |
| 実装タイプ | Through-Hole |
| ピン数 | 28 |
| RoHS ステータス | Compliant |
| Manufacturer | Renesas / Intersil |
ICM7228CIPI ピン構成
| ピン 1 | VSS — Ground |
| ピン 2 | D0 — Data bit 0 |
| ピン 3 | D1 — Data bit 1 |
| ピン 4 | D2 — Data bit 2 |
| ピン 5 | D3 — Data bit 3 |
| ピン 6 | D4 — Data bit 4 |
| ピン 7 | D5 — Data bit 5 |
| ピン 8 | D6 — Data bit 6 |
| ピン 9 | D7 — Data bit 7 |
| ピン 10 | CS — Chip select |
| ピン 11 | MODE — Decode mode select |
| ピン 12 | WRITE — Write strobe |
| ピン 13 | OSC — Oscillator input |
| ピン 14 | VDD — +5 V supply |
| ピン 15 | DIG1 — Digit 1 driver output |
| ピン 16 | DIG2 — Digit 2 driver output |
| ピン 17 | DIG3 — Digit 3 driver output |
| ピン 18 | DIG4 — Digit 4 driver output |
| ピン 19 | DIG5 — Digit 5 driver output |
| ピン 20 | DIG6 — Digit 6 driver output |
| ピン 21 | DIG7 — Digit 7 driver output |
| ピン 22 | DIG8 — Digit 8 driver output |
| ピン 23 | SEGa — Segment a output |
| ピン 24 | SEGb — Segment b output |
| ピン 25 | SEGc — Segment c output |
| ピン 26 | SEGd — Segment d output |
| ピン 27 | SEGe — Segment e output |
| ピン 28 | SEGf — Segment f output |
主な用途
ICM7228CIPI の用途: 6 件s: Digital Panel Meters, Digital Multimeters (DMM), Frequency Counters, Industrial Process Controllers, Point-of-Sale Terminals, Bench-Top Test Equipment.
Digital Panel Meters
The ICM7228CIPI's integrated 8-digit multiplex scan and BCD/hex decode make it ideal for digital panel meter front ends. With a 5 V supply and CMOS low quiescent current, the device draws minimal power from instrument transformer-isolated rails while driving standard 7-segment LED readouts. Placed between the ADC measurement front-end and the LED display, the ICM7228CIPI eliminates CPU refresh overhead because its internal oscillator automatically scans all 8 digits. Designers connect the ADC result bus to the ICM7228CIPI data inputs and read stable, flicker-free numeric readouts without timer interrupts, reducing firmware complexity in panel meter designs by approximately 70 percent. The 28-pin PDIP package suits through-hole meter enclosures where surface-mount parts would be difficult to hand-replace.
おすすめ
Digital Multimeters (DMM)
Bench-top and handheld digital multimeters benefit from the ICM7228CIPI's 8-digit common-cathode LED driver capability and 5 V CMOS operation. The on-chip BCD/hex decoder supports both decimal voltage/current displays and hex engineering readouts without external logic. Connected to the multimeter microcontroller via an 8-bit data bus and write strobe, the ICM7228CIPI handles all segment decoding and digit multiplexing in hardware, freeing the MCU for range switching, ADC sequencing, and continuity testing. Compared to discrete shift-register plus transistor driver designs, the ICM7228CIPI reduces PCB area by approximately 60 percent and improves reliability by eliminating timing skew between digit scans. The 28-PDIP package supports easy field service and component replacement in legacy multimeters.
おすすめ
Frequency Counters
Frequency counters and timer instruments rely on stable 8-digit numeric LED readouts that the ICM7228CIPI drives directly. With its internal multiplex scan oscillator running without CPU intervention, the device displays gate-time measurement results with no flicker and minimal host processor load. The CMOS process keeps the driver quiescent current low enough that battery-backed portable counters can run for hundreds of hours. Designers connect the counter's decade divider outputs to the ICM7228CIPI data bus and observe 8-digit readings of Hz or kHz without software multiplexing loops. Compared to a discrete LED driver approach, the ICM7228CIPI simplifies the BOM by replacing approximately 12 transistors, 8 resistors, and 2 shift registers with one IC.
おすすめ
Industrial Process Controllers
Industrial process controllers and PID front panels use the ICM7228CIPI to display setpoint and process variable values on 7-segment readouts. The 5 V CMOS operation interfaces directly to 8051-family microcontrollers and industrial PLCs over an 8-bit parallel bus. Operating temperature range of -20 °C to +85 °C covers most factory-floor cabinet environments without requiring additional thermal management. The ICM7228CIPI's hardware multiplex ensures that operators always see a stable, flicker-free numeric readout even during fast process transients, because the on-chip scan oscillator runs independently of the controller's task scheduling. The 28-PDIP package survives industrial vibration better than fine-pitch SMD alternatives, supporting longer field life in process control cabinets.
おすすめ
Point-of-Sale Terminals
Point-of-sale (POS) terminals use the ICM7228CIPI to drive 8-digit amount and quantity displays on cashier-facing readouts. The integrated BCD decoder accepts ASCII-style numeric codes directly from the POS controller, simplifying firmware and reducing bill-of-material cost. The 5 V single-supply operation aligns with standard POS terminal power rails and the CMOS process keeps standby current low for battery-backed receipt stations. Connected between the POS CPU and the customer display, the ICM7228CIPI automatically refreshes all 8 digits with hardware timing, eliminating the need for the controller to schedule display writes during peak transaction loads. Compared to software-driven LED multiplexing, the ICM7228CIPI improves display brightness consistency by approximately 15 percent.
おすすめ
Bench-Top Test Equipment
Bench-top test and measurement instruments including power supplies, signal generators, and component testers leverage the ICM7228CIPI's 8-digit 7-segment LED driver capability. The 28-pin PDIP package is well suited for hand-soldered prototypes and small-batch instrument builds where surface-mount assembly is uneconomical. Hardware decoding supports both engineering unit readouts (V, A, Hz) and raw count displays for laboratory use. The on-chip multiplex scan oscillator ensures stable numeric readouts across varying measurement update rates without requiring the host controller to maintain a precise refresh interrupt. Compared to FPGA- or CPLD-based LED controllers, the ICM7228CIPI offers a simpler, lower-cost solution for 8-digit readouts in price-sensitive test equipment.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ICM7228CIPI — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ICM7228BIPI | ICM7228AIPI | ICM7218CIPI |
|---|---|---|---|---|
| Brand | Renesas / Intersil | Renesas / Intersil | Renesas / Intersil | Renesas / Intersil |
| Package | PDIP-28 | PDIP-28 (same) | PDIP-28 (same) | PDIP-28 (same) |
| Number of Digits | 8 | 8 | 8 | 8 |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V |
| Decode Mode | BCD / Hex (C variant) | BCD / Hex (B variant) | BCD / Hex + single-digit access (A variant) | BCD / Hex (C variant) |
| Display Type | Common-cathode LED | Common-cathode LED | Common-cathode LED | Common-cathode LED |
| Operating Temperature | -20 °C to +85 °C | -20 °C to +85 °C | -20 °C to +85 °C | -20 °C to +85 °C |
| Multiplex Scan | Internal, 8-digit | Internal, 8-digit | Internal, 8-digit + single-digit access | Internal, 8-digit |
主な差別化要因
- C variant supports both BCD and hexadecimal decode modes with no software overhead （vs ICM7228AIPI)
- Modern generation with broader decode mode flexibility than the older ICM7218 family （vs ICM7218CIPI)
- 28-PDIP through-hole package for easier prototyping and field service （vs ICM7228AIPIZ (Pb-free PDIP))
設計ノート
Place a 0.1 µF ceramic decoupling capacitor within 5 mm of the VDD pin (pin 14) to prevent logic noise from disrupting the on-chip multiplex scan oscillator. The ICM7228CIPI generates internal segment timing edges that can inject switching transients into the supply; insufficient decoupling causes visible display flicker at high digit counts. For multi-IC boards, use a 10 µF bulk electrolytic plus a 0.1 µF ceramic per device.
The CMOS process yields very low quiescent current at the VDD pin, but the LED segment sink current dominates total supply current. Estimated: with 8 digits multiplexed at typical 5 mA segment current and average 1.4 lit segments per digit, total supply current is approximately 14 mA per digit scan cycle. Designers should size the 5V regulator to deliver at least 25 mA per ICM7228CIPI plus margin for digit transitions.
Do not connect the ICM7228CIPI directly to common-anode LED displays without external transistor buffers; the IC sinks current on segment lines and sources current on digit lines, intended for common-cathode configurations only. Reverse polarity will not damage the IC but will result in non-functional output. For common-anode designs, use the Maxim ICM7211 family instead. Also ensure the WRITE strobe pulse width meets the datasheet minimum to guarantee reliable data latching across all 8 digits.
コンプライアンス情報
RoHS compliant per Renesas / Intersil product page. 28-PDIP package available in Pb-free option (ICM7228AIPIZ). AEC-Q100 not applicable - this is an LED display driver for industrial/consumer use, not automotive grade.
