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Renesas ICM7228AIBI
- Part No.:
- ICM7228AIBI
- Manufacturer:
- Renesas
- Category:
- Display Drivers
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ICM7228AIBI.pdf
- Description:
- IC DRVR 7 SEGMNT 8 DIGIT 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,016
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Product details
Overview
ICM7228AIBI from Intersil is an 8-digit, microprocessor-compatible LED display decoder driver for common anode 7-segment displays. It integrates 8-byte static RAM, on-chip digit/segment drivers, multiplex scan circuitry, and supports Hexadecimal, Code B, and No Decode modes. It operates from a single 5V supply, delivers up to 200mA per digit and 25mA peak per segment, and is used in instrumentation and handheld test equipment.
For engineers reviewing the ICM7228AIBI datasheet, ICM7228AIBI pinout, ICM7228AIBI application, or ICM7228AIBI equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed use cases in panel displays and bargraph systems, and two rigorously cross-checked alternative parts with documented functional and interface differences.
Technical Context
The ICM7228AIBI implements a CMOS-based multiplexed LED driver architecture with an internal 390Hz scan oscillator, non-overlapping digit drive timing, and interdigit blanking to prevent ghosting. Its control logic accepts sequential 8-digit or single-digit RAM updates via MODE/IDx/WRITE protocol, with dedicated inputs for HEXA/CODE B selection (ID6), decode/no-decode mode (ID5), shutdown (ID4), and decimal point control (ID7).
It features dual RAM banks (A/B) selectable via ID3 during control register writes-enabling alternating display sets in decoded modes-and supports independent segment-level control in No Decode mode by mapping ID0–ID7 directly to segments a–g and DP. Digit outputs are common-anode N-channel drivers (min. 200mA), segment outputs are low-impedance N-channel drivers (typ. 25mA peak), eliminating external current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Display Format Support | Hexadecimal, Code B, and No Decode modes - enables alphanumeric digits or full segment-level control for bargraph/status panels. |
| Digit Drive Capability | 200mA min. per digit (common anode) - drives high-brightness 7-segment LEDs without external digit transistors. |
| Segment Drive Capability | 25mA peak per segment - sufficient for direct drive of standard 0.3"–0.5" common-anode LED displays. |
| Write Access Time | 200ns min. WRITE pulsewidth - compatible with 8-bit microcontrollers (e.g., 8051, PIC) without wait states. |
| Operating Supply | Single 5V ±10% - simplifies power design; no auxiliary voltage rails required. |
| Temperature Range | -40°C to +85°C - qualified for industrial instrumentation and field-deployed test equipment. |
| Shutdown Current | 1μA typical - preserves display RAM data while reducing system standby power. |
Pinout & Package
ICM7228AIBI is housed in a 28-lead SOIC package (JEDEC MS-013, pkg drawing M28.3), surface-mount compatible, RoHS-compliant (Pb-free plus anneal).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 24–28 | SEG c, SEG e, SEG b, DP, SEG f, SEG d, SEG g, SEG a, VSS | Segment outputs and ground - drive individual 7-segment cathodes (common-anode display); VSS is primary ground reference. |
| 5–8, 9–14 | ID6 (HEXA/CODE B), ID5 (DECODE), ID7 (DATA COMING), WRITE, MODE, ID4 (SHUTDOWN), ID1–ID3, ID0 | Control/data bus interface - bidirectional function: data inputs (MODE low) or control bits (MODE high) for format, bank, address, and power state. |
| 15–18, 20–23 | DIGIT 1, DIGIT 2, DIGIT 5, DIGIT 8, DIGIT 4, DIGIT 7, DIGIT 6, DIGIT 3 | Digit anode drivers - sink current from common-anode LED digit commons; grouped to minimize trace inductance in PCB layout. |
| 19, 20 | VDD | Positive supply rail - must be decoupled locally (0.1μF ceramic + 10μF tantalum) due to pulsed digit current demands. |
Key Features
| Feature | Design Value |
|---|---|
| No Decode Mode | Direct 8-bit segment mapping (ID0–ID7 → segments a–g + DP) enables custom glyphs, bargraphs, and status indicators without firmware decoding. |
| Dual RAM Banks (A/B) | Selectable via ID3 during control write - allows flicker-free alternation between two display sets (e.g., measurement/value + unit label) in Hex/Code B mode. |
| Interdigit Blanking | 2–10μs blanking interval between digit activations - eliminates visual ghosting in multiplexed displays under all operating conditions. |
| On-Chip Multiplex Oscillator | Fixed ~390Hz scan rate - removes need for external clock source or timing components; stable across -40°C to +85°C. |
| Common-Anode Direct Drive | Integrated 200mA digit drivers and 25mA segment drivers - eliminates external transistor arrays and current-limiting resistors, reducing BOM count and board area. |
Applications
| Instrumentation Panel Display | Handheld Test Equipment |
|---|---|
|
Use Scenario: Front-panel numeric readout in digital multimeters and oscilloscope displays requiring high legibility and reliability across temperature extremes. IC Role / Device Role / Timing Role: Primary LED display controller interfacing to 8051 or ARM Cortex-M0 MCU via memory-mapped I/O; handles multiplex timing, segment/digit drive, and RAM buffering. Use Value: Eliminates external decoding logic and driver transistors; reduces firmware overhead via hardware-based Hex/Code B decoding and dual-bank RAM switching. |
Use Scenario: Battery-powered portable calibrators and signal generators needing low standby current and robust display operation at -20°C ambient. IC Role / Device Role / Timing Role: Standalone display subsystem managing 8-digit common-anode LED array; uses shutdown mode (1μA) during sleep and resumes instantly on wake. Use Value: Maintains display RAM content down to 2V supply; enables instant display restoration without MCU reinitialization after brownout recovery. |
| Bargraph Status Indicator | Industrial Control Panel |
|
Use Scenario: Visual status bar in PLC I/O modules showing analog input level or fault severity across 8 discrete LED segments. IC Role / Device Role / Timing Role: Segment-level controller using No Decode mode to map each ID0–ID7 bit directly to one LED segment, enabling independent on/off control. Use Value: Replaces 8 discrete driver ICs or shift-register + transistor solutions; achieves uniform brightness regardless of active segment count due to high segment output impedance. |
Use Scenario: Operator interface on factory-floor HMIs where LCDs fail at high/low temperatures and mechanical vibration is present. IC Role / Device Role / Timing Role: Ruggedized numeric display engine driving high-intensity 0.5" common-anode LEDs; interfaces via parallel bus with isolated microcontroller. Use Value: Delivers >200mA digit current to sustain brightness under ambient light; operates reliably from -40°C to +85°C without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED display driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICM7228AIBIZ | Pb-free SOIC variant of same die; identical electrical specs, pinout, and timing; RoHS-compliant finish with matte tin plating. | Required for new designs targeting RoHS compliance; drop-in replacement for ICM7228AIBI in wave-solder or reflow assembly. | Select ICM7228AIBIZ for production builds requiring Pb-free certification; legacy ICM7228AIBI is obsolete per manufacturer notice. |
| MAX7219CNG+ | Serial SPI interface (vs. parallel ICM7228AIBI); includes built-in BCD decode, intensity control, and scan-limit registers; 20mA segment drive only. | Suitable for space-constrained designs with microcontrollers offering SPI; not pin-compatible; requires different firmware interface and external current-limiting resistors. | Choose MAX7219CNG+ when reducing MCU GPIO count and adding brightness control outweighs loss of No Decode mode and direct segment access. |
Compared with ICM7228AIBI, ICM7228AIBIZ offers identical functionality with updated environmental compliance, while MAX7219CNG+ trades parallel simplicity and full segment control for serial efficiency and integrated intensity scaling - making it better suited for compact, software-flexible designs rather than high-current, direct-drive applications.
Availability
ICM7228AIBI is available at Aetrix Electronics and suitable for instrumentation, handheld test equipment, and industrial control panels requiring stable component supply and long-term obsolescence management.
Supply support for ICM7228AIBI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, aerospace, and test & measurement markets.
The ICM7228 product line was designed to replace discrete LED display driver solutions with a single-chip, microprocessor-compatible solution supporting both decoded and raw segment control for rugged panel instrumentation.
FAQ
What is the primary function of the ICM7228AIBI in a microprocessor system?
The ICM7228AIBI serves as a dedicated 8-digit LED display controller that interfaces directly with microprocessors via parallel bus. It manages display RAM, performs hexadecimal or Code B decoding, drives common-anode digits and segments, and handles multiplex timing - offloading these tasks from the host MCU and eliminating external driver components. Its MODE/WRITE protocol allows seamless integration as memory-mapped I/O.
Does the ICM7228AIBI support both common-anode and common-cathode LED displays?
No - the ICM7228AIBI is specifically configured for common-anode LED displays. It integrates high-current N-channel digit drivers that sink current from digit anodes, and low-impedance N-channel segment drivers that source current to segment cathodes. For common-cathode displays, the ICM7228BIBI variant must be used instead.
How does the No Decode mode work on the ICM7228AIBI, and what applications benefit most from it?
In No Decode mode (enabled by setting ID5 high during control register write), the ICM7228AIBI bypasses character decoding and maps ID0–ID7 directly to segments a–g and decimal point (DP), with DP active-low. This enables full 64-segment control across 8 digits - ideal for bargraphs, custom icons, status indicators, or mixed alphanumeric/non-standard glyphs where firmware-level decoding would add latency or complexity.
What is the recommended replacement for the discontinued ICM7228AIBI, and how does it differ?
The manufacturer-recommended replacement is ICM7228AIBIZ - a Pb-free, RoHS-compliant version in the same 28-lead SOIC package. It shares identical electrical specifications, timing, pinout, and functionality with ICM7228AIBI. The only differences are matte tin termination finish and qualification for lead-free soldering processes; no design or firmware changes are required for migration.
Can the ICM7228AIBI retain display data during power-down or low-voltage conditions?
Yes - the ICM7228AIBI retains its 8-byte display RAM contents down to VDD = 2V, even in shutdown mode (ID4 = low), where supply current drops to 1μA typical. This allows battery-backed or energy-harvesting systems to preserve display state during brownouts or sleep cycles and restore visibility immediately upon voltage recovery, without MCU intervention.
ICM7228AIBI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Display Type:
- LED
- Configuration:
- 7 Segment
- Interface:
- -
- Digits or Characters:
- 8 Digits
- Current - Supply:
- 200 µA
- Voltage - Supply:
- 4V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
ICM7228AIBI FAQ
1.How can I place an order for ICM7228AIBI through Aetrix?
Please submit a Request for Quotation (RFQ) for ICM7228AIBI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ICM7228AIBI reliable?
The price and inventory of ICM7228AIBI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICM7228AIBI is usually 5 days.
3.What payment methods are accepted for ICM7228AIBI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICM7228AIBI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICM7228AIBI?
ICM7228AIBI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICM7228AIBI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ICM7228AIBI?
For technical support, including ICM7228AIBI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICM7228AIBI requirements.
6.How does Aetrix verify that ICM7228AIBI is sourced from the original manufacturer or authorized distributors?
All ICM7228AIBI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ICM7228AIBI meets industry standards.
7.What is the process for return or replacement of ICM7228AIBI?
All ICM7228AIBI units undergo pre-shipment inspection (PSI). If there is an issue with ICM7228AIBI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ICM7228AIBI part is unused and in its original packaging.
Return procedure for ICM7228AIBI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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