ICM7228BIPIZ - 8-Digit LED Display Driver, 28-PDIP | Renesas
MPN: ICM7228BIPIZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $24.2464 | $24.25 |
| 10 | $22.5 | $225.00 |
| 100 | $20.8 | $2,080.00 |
| 500 | $19.1 | $9,550.00 |
| 1,000 | $17.4 | $17,400.00 |
ICM7228BIPIZ Overview
What is an LED display decoder driver? An LED display decoder driver is an interface IC that bridges a microprocessor or digital logic to a multiplexed 7-segment LED display. It accepts parallel or serial numeric data, decodes it into 7-segment patterns using internal lookup tables, and generates the time-multiplexed drive signals that sequentially energize each digit position. By replacing dozens of discrete logic gates, BCD-to-7-segment decoders, and discrete transistors, these parts dramatically reduce PCB area, BOM count, and design complexity for numeric readouts. The ICM7228 family sits within the broader Display Driver category of power management/interface ICs.
Key features of the ICM7228BIPIZ include direct microprocessor bus interfacing with no external components required for static display memory, on-chip multiplex scan oscillator, sixteen segment drivers, and eight digit drivers. The "B" suffix indicates a non-latching, Code B/HEX decoder with a built-in 8-character RAM, allowing random access to any digit via address lines. The ICM7228A variant differs only by its single-digit access mode and pin mapping; the ICM7228B is designed to be a drop-in upgrade for Intersil ICM7218 designs.
Typical applications include panel meters, test equipment readouts, instrumentation front panels, hand-held instruments, and bargraph displays. Designers choose the ICM7228BIPIZ when they need a robust, time-proven display driver with a well-documented interface and no firmware-driven multiplexing burden. When planning the PCB layout, ensure the digit driver outputs connect to common-cathode digit commons with appropriate current-setting resistors in series with each segment, and place the device close to the display to minimize EMI and trace resistance.
Drop-in alternatives for ICM7228BIPIZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ICM7228BIPIZ (same form factor and footprint) — differing in Display Type, Function, Interface, Mounting Type, Manufacturer.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ICM7228BIPIZ
✅ Drop-In✓ In Stock
$17.4 / Unit
View Datasheet →ICM7228AIPIZ
✅ Drop-In✓ In Stock
$10.75 / Unit
View Datasheet →ICM7218BIPI+
✅ Drop-In📋 Reference alternative (not in catalog)
ICM7218DIPI+
✅ Drop-In📋 Reference alternative (not in catalog)
ICM7228DIPIZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ICM7228BIPIZ Specifications
| Manufacturer | Renesas Electronics (formerly Intersil) |
| Part Number | ICM7228BIPIZ |
| Function | 8-Digit, 7-Segment LED Display Decoder Driver |
| Display Type Supported | Common-cathode 7-segment LED |
| Number of Digits | 8 |
| Number of Segment Outputs | 16 (segments + decimal points) |
| Number of Digit Outputs | 8 |
| Supply Voltage (V+) | 4 V to 6 V |
| Supply Current | 200 uA (typical) |
| Interface | 8-bit parallel microprocessor bus |
| Decoder Type | Code B / HEX with internal 8-byte RAM |
| Multiplex Scan | Internal oscillator, no external components |
| Package Type | 28-pin PDIP (Plastic DIP) |
| Operating Temperature | -40C to +85C |
| Mounting Type | Through-Hole |
| RoHS Status | Compliant |
ICM7228BIPIZ Pin Configuration
| Pin 1 | V+ — Logic supply voltage (4V-6V) |
| Pin 2 | D7 — Digit 7 driver output (digit common) |
| Pin 3 | D6 — Digit 6 driver output |
| Pin 4 | D5 — Digit 5 driver output |
| Pin 5 | D4 — Digit 4 driver output |
| Pin 6 | D3 — Digit 3 driver output |
| Pin 7 | D2 — Digit 2 driver output |
| Pin 8 | D1 — Digit 1 driver output |
| Pin 9 | D0 — Digit 0 driver output (rightmost) |
| Pin 10 | GND — Ground reference |
| Pin 11 | GND — Ground reference |
| Pin 12 | CS — Chip select (active low) |
| Pin 13 | WR — Write strobe (active low) |
| Pin 14 | MODE — Mode select (Code B / HEX) |
| Pin 15 | A0 — RAM address bit 0 (LSB) |
| Pin 16 | A1 — RAM address bit 1 |
| Pin 17 | A2 — RAM address bit 2 (MSB) |
| Pin 18 | DB0 — Data bus bit 0 (BCD LSB) |
| Pin 19 | DB1 — Data bus bit 1 |
| Pin 20 | DB2 — Data bus bit 2 |
| Pin 21 | DB3 — Data bus bit 3 (BCD MSB) |
| Pin 22 | a — Segment a driver output |
| Pin 23 | b — Segment b driver output |
| Pin 24 | c — Segment c driver output |
| Pin 25 | d — Segment d driver output |
| Pin 26 | e — Segment e driver output |
| Pin 27 | f — Segment f driver output |
| Pin 28 | g — Segment g driver output |
Typical Applications
ICM7228BIPIZ is suitable for 6 applications: Digital Panel Meters, Test and Measurement Instrumentation, Hand-Held Instruments and Portable Devices, Bargraph Displays, Industrial Process Control Front Panels, Audio Equipment and Studio Displays.
Digital Panel Meters
The ICM7228BIPIZ is ideally suited for digital panel meters requiring an 8-digit, 7-segment LED readout of voltage, current, power, or frequency. Its on-chip multiplex scan eliminates the need for an external microcontroller-driven time-division scheme, freeing the host MCU to focus on ADC sampling and averaging. The 4V to 6V supply range allows direct operation from a regulated 5V rail, and the internal 8-byte display RAM supports independent random-access writes to each digit. Compared to discrete BCD-to-7-segment decoder plus transistor array solutions, the ICM7228BIPIZ reduces the BOM by approximately 10-15 components and simplifies PCB routing. The 200 uA quiescent current makes it suitable for power-meter applications where standby consumption must remain low.
Recommended
Test and Measurement Instrumentation
Bench-top multimeters, frequency counters, signal generator front panels, and laboratory instruments benefit from the ICM7228BIPIZ's robust 8-digit LED drive capability. The parallel microprocessor interface allows a host controller to update individual digits in microseconds, enabling rapid refresh of measured values without flicker. The internal HEX/Code B decoder supports direct hexadecimal readout for diagnostic or address displays, in addition to decimal numeric display for measurement readouts. The 28-PDIP through-hole package simplifies prototype assembly and field-replaceable repairs in industrial test equipment. Designers can cascade two ICM7228BIPIZ parts via separate chip-select lines to drive 16-digit readouts for high-resolution DMM displays.
Recommended
Hand-Held Instruments and Portable Devices
Battery-powered hand-held instruments such as portable multimeters, tachometers, and environmental meters use the ICM7228BIPIZ for compact 8-digit LED readouts. The 200 uA quiescent current keeps idle consumption low, while the LED segment current flows only through the digit drivers during the multiplex active duty cycle, maximizing battery life. The 4V minimum supply allows operation directly from three AA cells (4.5V nominal) or a single Li-ion cell with a boost converter. The internal multiplex oscillator requires no external RC timing components, reducing both BOM cost and PCB area. Industrial temperature grade (-40C to +85C) ensures reliable operation in outdoor or factory-floor environments.
Recommended
Bargraph Displays
The ICM7228BIPIZ can drive bargraph-style LED indicators by using the 8-byte RAM as a level-controlled display buffer, where the host writes a value from 0 to 8 to illuminate a proportional number of digit positions. This is particularly useful for audio level meters, signal-strength indicators, and process-control setpoint displays. The internal segment decoder can be bypassed for custom bargraph patterns by writing segment patterns directly to the display RAM. The on-chip multiplex scan ensures uniform brightness across all lit segments without host intervention. Compared to dedicated LED bargraph driver ICs, the ICM7228BIPIZ offers more flexibility through its full 7-segment+DP drive per digit position.
Recommended
Industrial Process Control Front Panels
Factory-floor operator interface panels, programmable logic controller (PLC) HMI readouts, and process-control setpoint displays rely on the ICM7228BIPIZ for clear, high-visibility numeric indication under harsh lighting conditions. The 28-PDIP through-hole package withstands vibration and thermal cycling better than surface-mount equivalents, making it suitable for industrial environments. The parallel bus interface integrates directly with legacy 8-bit microcontrollers still common in industrial automation, requiring no SPI or I2C peripheral. The 4V-6V supply range is compatible with 5V industrial logic rails. Designers can use the chip-select (CS) line to share the data bus with multiple ICM7228BIPIZ devices for larger multi-channel displays.
Recommended
Audio Equipment and Studio Displays
Studio audio equipment such as digital audio workstations (DAW), rack-mounted preamplifiers, and metering units use the ICM7228BIPIZ to drive numeric level, frequency, or track-time readouts. The internal 8-byte RAM enables smooth digit updates without flicker, and the parallel interface allows direct connection to audio DSP processors. The 7-segment+DP drive supports decimal point indication for time displays (mm:ss.s) and frequency readouts (XXX.X Hz). The HEX decoder mode is useful for displaying binary audio sample values during diagnostic routines. Industrial temperature grade ensures stable operation in equipment racks with elevated ambient temperatures.
Recommended
Recommended Products Summary
Engineering reference data for ICM7228BIPIZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ICM7228AIPIZ | ICM7218BIPI+ | ICM7218DIPI+ | ICM7228DIPIZ |
|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Maxim Integrated | Maxim Integrated | Renesas Electronics |
| Package | 28-PDIP | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same |
| Supply Voltage | 4V to 6V | 4V to 6V | 4V to 6V | 4V to 6V | 4V to 6V |
| Quiescent Current | 200 uA | 200 uA | 200 uA | 200 uA | 200 uA |
| Number of Digits | 8 | 8 | 8 | 8 | 8 |
| Decoder Type | Code B / HEX with 8-byte RAM | Code B / HEX with single-digit access mode | Code B / HEX (legacy, software incompatible) | Code B / HEX, no DP variant | Code B / HEX alternate mode |
| Single-Digit Access Mode | No (B suffix) | Yes (A suffix) | No | No | No |
| ICM7218 Software Compatible | Yes (drop-in upgrade) | Yes (with firmware update for access mode) | N/A (is the legacy part) | N/A (is the legacy part) | Yes (drop-in upgrade) |
Key Differentiators
- Single-drop-in upgrade for ICM7218 designs with no firmware changes (vs ICM7218BIPI+)
- True drop-in for ICM7228 family with added single-digit access mode (vs ICM7228AIPIZ)
- Industry-standard 8-digit LED drive in through-hole package (vs MAX7219)
Design Notes
Place the V+ supply pin bypass capacitor (0.1 uF ceramic) as close as possible to pin 1, with a short ground return to the GND pins (10-11). The ICM7228BIPIZ multiplexes digit drivers at a relatively high frequency, so keep the LED segment and digit traces short and use a ground plane to minimize EMI. If driving high-current LEDs (>10 mA per segment), consider a 4-layer PCB with a dedicated ground plane to handle the return currents without injecting noise into adjacent analog circuitry.
Do not confuse the ICM7228B with the ICM7228A - the B variant lacks the single-digit access mode and has a different pin mapping for the MODE pin. Firmware written for the ICM7218B family must be reviewed before being ported to the ICM7228B because the decoder behavior and segment blanking differ slightly. Always verify the datasheet revision before committing to a design. The 'Z' suffix in ICM7228BIPIZ denotes lead-free / RoHS-compliant terminal finish.
Estimated: total supply current for an 8-digit display with all segments lit is approximately I_total = N_digits x I_segment x (segments_per_digit / 2) for time-averaged common-anode drive. With 8 digits, 7 segments lit, and 10 mA peak segment current, average V+ current is roughly 8 x 10mA x 7/2 = 280 mA. Include headroom in your 5V regulator for this transient current; a 500 mA LDO or switching regulator is recommended. The 200 uA quiescent current spec applies when all digit drivers are off.
Compliance Information
RoHS compliant per Renesas product page and DigiKey listing. The 'Z' suffix indicates lead-free terminal finish. Industrial temperature grade (-40C to +85C) per the 'I' suffix.
