AS1108WL - 4-Digit LED Display Driver, SPI/QSPI, 20-SOIC
Référence : AS1108WL ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.36 | $336,00 |
| 500 | $2.94 | $1 470,00 |
| 1 000 | $2.62 | $2 620,00 |
AS1108WL Présentation
A 7-segment LED display driver is an interface IC that translates a microcontroller's serial or parallel data into the seven segment lines (plus decimal point) required to render numeric or alphanumeric characters on LED displays. The AS1108WL belongs to the LED display driver sub-category of display drivers, which in turn fall under power management ICs (PMIC) and interface ICs; it converts low-voltage logic-level serial data from a host MCU into multiplexed, current-regulated outputs that directly sink or source the high currents needed by common-anode or common-cathode LED displays.
Key features include 10 MHz SPI/QSPI/Microwire-compatible serial I/O, individual segment control with hardware blinking (synchronizable across cascaded drivers), hexadecimal or BCD-code with no-decode digit selection, and a 3 µA low-power shutdown mode for battery-aware applications. The integrated digit multiplexers and current-controlled segment drivers offload the LED refresh task from the host MCU, allowing the system processor to enter low-power states between display updates. The AS1108WL includes a serial data output pin for daisy-chaining multiple drivers to expand the display.
Typical applications include industrial control panel meters, point-of-sale (POS) terminals, medical instrument readouts, white-goods and appliance front panels, weighing scales, and digital thermometer/clocks. The wide operating voltage range and small SOIC-20 footprint also make it suitable for handheld instruments and consumer devices where PCB area is constrained and a simple 4-wire SPI bus is preferred over parallel drive.
When designing with the AS1108WL, observe the supply decoupling guidelines from the manufacturer datasheet: place a 0.1 µF ceramic bypass capacitor close to V+ and a bulk capacitor on the LED supply rail to handle the multiplexed peak segment currents. Use the BLINK register to synchronize blink rate across multiple cascaded AS1108 devices by loading the same configuration and clock frequency.
This page synthesizes distributor stock, cross-reference information, and practical LED multiplexing design notes not aggregated in a single place on the manufacturer datasheet.
Alternatives de remplacement direct pour AS1108WL — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
AS1108WL-T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AS1108WL
✅ Remplacement direct✓ En stock
$2.62 / unité
Voir la fiche technique →MAX6951
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TLC5916
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
AS1108WL Valeurs maximales et caractéristiques électriques
| Product Type | LED Display Driver |
| Display Configuration | 4-Digit 7-Segment or 4x8 Dot-Matrix |
| Interface | SPI / QSPI / Microwire / 4-wire Serial |
| Serial Clock Frequency | 10 MHz (max) |
| Integrated Decoder | BCD Code-B / HEX |
| No-Decode Mode | Yes (individual segment control) |
| Blink Control | Yes, hardware, multi-driver synchronizable |
| Courant d'arrêt | 3 µA (typical) |
| Boîtier | 20-SOIC (Wide, 7.50 mm body width) |
| Nombre de broches | 20 |
| Type de montage | Surface Mount |
| Cascadable | Yes (serial data output for daisy-chain) |
Configuration des broches de AS1108WL
| Broche 1 | DIN — Serial data input |
| Broche 2 | CLK — Serial clock input (10 MHz max) |
| Broche 3 | LOAD/CS — Load (active-low chip select) - latches serial data on rising edge |
| Broche 4 | GND — Ground |
| Broche 5 | DOUT — Serial data output for cascaded drivers |
| Broche 6 | V+ — Positive logic supply |
| Broche 7 | DIG0 — Digit driver 0 output |
| Broche 8 | DIG1 — Digit driver 1 output |
| Broche 9 | DIG2 — Digit driver 2 output |
| Broche 10 | DIG3 — Digit driver 3 output |
| Broche 11 | SEG DP — Segment driver - decimal point |
| Broche 12 | SEG A — Segment driver A |
| Broche 13 | SEG B — Segment driver B |
| Broche 14 | SEG C — Segment driver C |
| Broche 15 | SEG D — Segment driver D |
| Broche 16 | SEG E — Segment driver E |
| Broche 17 | SEG F — Segment driver F |
| Broche 18 | SEG G — Segment driver G |
| Broche 19 | NC — Not connected (per datasheet) |
| Broche 20 | NC — Not connected (per datasheet) |
Applications typiques
AS1108WL convient pour 6 applications: Industrial Control Panel Meters, Point-of-Sale (POS) Terminals, Medical Instrument Readouts, White-Goods Appliance Front Panels, Digital Weighing Scales, Digital Clocks and Thermometers.
Industrial Control Panel Meters
The AS1108WL drives up to four 7-segment digits on a process-control front panel, displaying setpoint, flow rate, or pressure values read from a sensor ADC. Its 10 MHz SPI/QSPI-compatible serial interface lets an industrial MCU update the panel at refresh rates well above the 100 Hz flicker threshold, while the integrated BCD Code-B/HEX decoder removes the need for a character lookup table in firmware. Hardware segment blinking synchronizable across cascaded AS1108WL devices provides alarm indicators without consuming MCU GPIO pins.
Recommandé
Point-of-Sale (POS) Terminals
The AS1108WL is well suited to POS terminals that show price, total, and change amounts on a 4-digit 7-segment customer-facing display. Its low 3 µA shutdown current preserves battery life in mobile POS terminals between transactions, and the 4-wire SPI interface minimizes GPIO usage on the terminal's payment-controller MCU. Cascading two AS1108WL devices via the DOUT pin extends the display to 8 digits for currency-plus-decimal readouts.
Recommandé
Medical Instrument Readouts
The AS1108WL drives the front-panel numeric readout of medical instruments such as infusion pumps, blood-pressure monitors, and digital thermometers, where clean numeric readability and low EMI emissions are critical. The IC's internal constant-current segment drivers reduce BOM count versus discrete transistor arrays, and the SPI bus keeps the analog signal-conditioning PCB area free of high-current LED traces. The hardware blink feature can highlight alarm conditions without firmware polling overhead.
Recommandé
White-Goods Appliance Front Panels
The AS1108WL sits behind the control-panel overlay of washing machines, ovens, and dishwashers to display timer, temperature, and program status on a 4-digit read-out. The wide 20-SOIC package handles the segment multiplexing currents without thermal stress in continuous-on appliance duty cycles, and the SPI interface connects directly to the appliance's main control MCU. Shutdown current of 3 µA supports standby-mode energy compliance for ENERGY STAR-rated appliances.
Recommandé
Digital Weighing Scales
The AS1108WL drives the four-digit weight display on retail and laboratory weighing scales that connect to a load-cell ADC. Its BCD Code-B hardware decoder accepts packed numeric data directly from the scale's measurement firmware, eliminating segment-encoding tables and reducing code size on small 8-bit MCUs. The serial clock up to 10 MHz permits high-rate updates during settling, and the cascade output lets a 5-digit scale use two AS1108WL devices without an extra chip-select line.
Recommandé
Digital Clocks and Thermometers
The AS1108WL powers the 4-digit HH:MM or temperature readout on desk clocks, wall timers, and consumer digital thermometers, where the SPI bus is shared with an RTC or sensor front-end. The blink-control register can be configured to flash the colon or degree symbol at 1 Hz for a visible seconds indicator without timer interrupts, and the 3 µA shutdown current is ideal for battery-backup clock operation during mains loss.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour AS1108WL — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | AS1108WL-T | MAX6951 | TLC5916 |
|---|---|---|---|---|
| Package | 20-SOIC (Wide, 7.50 mm) | 20-SOIC (Wide, 7.50 mm) - same | 20-SOIC - same footprint, different pinout | 20-SOIC - same footprint, different pinout |
| Brand | ams-OSRAM | ams-OSRAM (same brand) | Analog Devices (cross-brand) | Texas Instruments (cross-brand) |
| Display Configuration | 4-digit 7-segment / 4x8 dot-matrix | 4-digit 7-segment / 4x8 dot-matrix - identical | 5x7 matrix per digit, 8-digit address | 8-channel constant-current sink only |
| Serial Interface | SPI / QSPI / Microwire (4-wire) | SPI / QSPI / Microwire - identical | I2C (2-wire) | SPI (no QSPI) |
| Serial Clock Frequency | 10 MHz max | 10 MHz max - identical | 400 kHz (I2C fast-mode) | 25 MHz |
| Integrated Decoder | BCD Code-B / HEX | BCD Code-B / HEX - identical | No (user-defined 5x7 font) | No (constant-current only) |
| Hardware Blink Control | Yes, multi-driver synchronizable | Yes - identical | No | No |
| Pin Compatibility | Reference | Pin-to-pin identical | Same 20-SOIC package, different pinout | Same 20-SOIC package, different pinout |
Principaux différenciateurs
- Integrated BCD Code-B / HEX decoder (vs TLC5916)
- 10 MHz SPI/QSPI/Microwire interface speed (vs MAX6951)
- Hardware multi-driver blink synchronization (vs TLC5916)
Notes de conception
Estimated: place a 0.1 µF ceramic bypass capacitor as close as possible to the V+ pin (within 2-3 mm trace length) to suppress the high-frequency switching transients from the internal digit multiplexers. Add a bulk electrolytic or tantalum capacitor (e.g., 10 µF) on the LED supply rail if digit common-anode or common-cathode wiring runs more than 50 mm, since the multiplexed peak segment current can briefly exceed 100 mA per digit. The 3 µA shutdown mode lets the host MCU power-gate the display during standby.
Estimated: route the SPI bus (CLK, DIN, LOAD, DOUT) as a short, parallel group on a single inner layer with a continuous ground plane beneath to minimize crosstalk into the analog sensor front-end. Keep segment/digit driver traces away from sensitive analog inputs, and place current-setting resistors near the digit-driver pins. For cascaded designs, route DOUT directly to the next device's DIN to avoid ground bounce from long daisy-chained traces.
Do not exceed the absolute maximum digit-driver current per the manufacturer datasheet when designing common-anode displays with low-Vf LEDs - the segment current can double if the digit duty cycle is miscalculated for displays with fewer than 4 digits. Always load the shutdown register before power-down and verify the BLINK register values on cascaded devices match exactly; mismatched blink rates cause visible jitter. Confirm V+ logic-level compatibility with the host MCU before PCB fabrication to avoid rework on 3.3 V vs 5 V systems.
Informations de conformité
Specific RoHS, REACH, lead-free and halogen-free status not present in the verified web data for AS1108WL; consult the manufacturer datasheet or contact ams-OSRAM technical support before committing the part to a regulated design.
