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Renesas ISL29028IROZ-T7
- Part No.:
- ISL29028IROZ-T7
- Manufacturer:
- Renesas
- Category:
- Ambient Light, IR, UV Sensors
- Package:
- 8-VFDFN Exposed Pad
- Datasheet:
-
ISL29028IROZ-T7.pdf
- Description:
- SENSOR OPT AMBIENT 8 VFDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,707
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Product details
Overview
ISL29028IROZ-T7 from Renesas (formerly Intersil) is a dual-function ambient light and proximity sensor IC with integrated IR LED driver, I²C interface, and intelligent interrupt logic. It concurrently measures visible light (0–2000 lux, human-eye-matched spectral response) and proximity (8-bit IR reflection, 540 µs conversion) while rejecting 50/60 Hz flicker and ambient IR noise. It targets display dimming and presence detection in smartphones and laptops.
For engineers reviewing the ISL29028IROZ-T7 datasheet, ISL29028IROZ-T7 pinout, ISL29028IROZ-T7 application, or ISL29028IROZ-T7 equivalent, key selection criteria include its dual ADC architecture, programmable IR drive current (110/220 mA), 138 µA typical active supply current, 8-lead ODFN package (2.0 × 2.1 × 0.7 mm), and configurable interrupt persistency (1/4/8/16 consecutive triggers).
Technical Context
The ISL29028IROZ-T7 integrates two independent ADCs: a 12-bit charge-balancing integrating ADC for ambient light sensing (100 ms integration, 50/60 Hz rejection) and an 8-bit successive-approximation ADC for proximity sensing (540 µs conversion). Its IR LED driver delivers precisely timed 100 µs current pulses (110 mA or 220 mA) via the IRDR pin, synchronized to proximity measurement cycles.
Interrupt generation is fully configurable via I²C registers: ALS interrupts trigger on out-of-window measurements; proximity interrupts activate when readings exceed threshold for 1–16 consecutive conversions; INT pin output logic (OR/AND of ALS/Prox flags) and persistency are software-selectable. The device operates from 2.25 V to 3.63 V across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Ambient Light Range | Selectable 125 lux / 2000 lux full-scale; enables high-resolution low-light or robust high-brightness operation |
| ALS Conversion Time | 100 ms per sample; integer multiple of 50/60 Hz periods ensures inherent flicker noise rejection |
| Proximity Conversion Time | 540 µs per reading; includes 100 µs IR LED pulse and ambient IR subtraction |
| IR Drive Current | Programmable 110 mA or 220 mA sink via PROX_DR bit; supports diverse external IR LED forward voltage drops |
| Supply Current (Active) | 138 µA typical total (110 µA internal + 28 µA avg. LED drive); enables battery-sensitive portable designs |
| I²C Interface | SMBus-compatible, 400 kHz max clock; ADDR0 pin selects slave address (0x44 or 0x45) |
| Operating Voltage | 2.25 V to 3.63 V for sensor core; I²C bus tolerant up to 3.63 V with 1.7 V minimum |
Pinout & Package
Packaged in a lead-free, RoHS-compliant 8-lead ODFN (2.0 mm × 2.1 mm × 0.7 mm) with exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| T.PAD (Thermal Pad) | Thermal and electrical reference | Must be connected to GND for optimal thermal performance and noise immunity; electrically isolated option permitted |
| ADDR0 | I²C address select | Logic level sets slave address to 0x44 (low) or 0x45 (high); must not float |
| VDD | Main power supply | 2.25–3.63 V input for sensor core and internal circuitry; separate from I²C bus voltage |
| GND | Analog/digital ground | Common return path for all currents; requires low-impedance connection to T.PAD if grounded |
| REXT | Reference resistor node | Connects 499 kΩ ±1% resistor to GND; sets internal reference voltage (0.51 V) and ADC gain |
| SCL | I²C clock line | Open-drain input; accepts 1.7–3.63 V logic levels; Schmitt-triggered for noise immunity |
| SDA | I²C data line | Open-drain bidirectional; 3–5 mA sink capability at 0.4 V; supports standard/fast-mode I²C |
| INT | Interrupt output | Open-drain logic output; asserts low on ALS/Prox interrupt per INT_CTRL register setting |
| IRDR | IR LED driver sink | Current-sinking output for external IR LED cathode; 110/220 mA pulsed, 500 ns rise/fall time |
Key Features
| Feature | Design Value |
|---|---|
| Dual concurrent sensing | Independent 12-bit ALS and 8-bit proximity ADCs operate simultaneously without timing conflict |
| Flicker & ambient IR rejection | 100 ms ALS integration rejects 50/60 Hz artificial light; proximity ADC subtracts pre-/post-LED IR samples to cancel sunlight |
| Configurable interrupt logic | Per-sensor thresholds, 1/4/8/16-persistency, and OR/AND flag combination reduce MCU polling overhead |
| Ultra-low-power operation | 138 µA typical active current and <1.0 µA shutdown current extend battery life in portable devices |
| Human-eye spectral match | ALS photodiode response closely tracks CIE luminosity curve (Figure 6, datasheet), enabling accurate lux calculation |
Applications
| Smartphone Display Management | Laptop Keypad Backlight Control |
|---|---|
Use Scenario: Automatic brightness adjustment and proximity-based screen blanking during calls. IC Role / Device Role / Timing Role: ISL29028IROZ-T7 provides real-time ambient lux and proximity distance data via I²C every 100 ms (ALS) and 540 µs (Prox), triggering system-level display dimming or sleep. Use Value: Eliminates manual brightness control, reduces power consumption by dimming backlight under low ambient light, and prevents accidental touch input during calls. |
Use Scenario: Adaptive keypad illumination that activates only when hands approach and dims in bright environments. IC Role / Device Role / Timing Role: ISL29028IROZ-T7 acts as the primary environmental sensor, delivering ALS counts proportional to ambient lux and proximity events to the system MCU via interrupt-driven I²C reads. Use Value: Extends battery runtime by disabling backlight when ambient light exceeds threshold or no hand presence is detected, improving user experience in varying lighting conditions. |
| Industrial HMI Panel Dimming | Medical Device Presence Detection |
Use Scenario: Brightness regulation of touchscreen interfaces in factory settings with fluorescent and LED lighting. IC Role / Device Role / Timing Role: ISL29028IROZ-T7 continuously monitors ambient light and rejects 50/60 Hz flicker, providing stable lux values to the HMI controller for consistent display output. Use Value: Ensures readability across diverse industrial lighting conditions while maintaining low EMI due to integrated noise-rejecting ADC architecture. |
Use Scenario: Non-contact patient proximity detection for bedside monitors to initiate wake-up or privacy mode. IC Role / Device Role / Timing Role: ISL29028IROZ-T7 performs periodic proximity measurements using its 220 mA IR drive capability and ambient IR cancellation, detecting presence within ~10 cm. Use Value: Enables hygienic, maintenance-free activation without physical buttons; reliable operation under clinical lighting including intense overhead LEDs and sunlight. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ambient light and proximity sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay VEML3235 | Single-chip ALS+Prox with I²C; 100 ms ALS integration but no configurable IR drive amplitude; smaller 2.0 × 1.8 mm QFN | Lacks programmable 110/220 mA IR drive and ALS range switching; lower peak current limits proximity range in high-reflectivity scenarios | Choose VEML3235 for space-constrained designs where fixed 100 mA IR drive suffices and ALS range flexibility is unnecessary. |
| ams TMD26721 | ALS+Prox sensor with integrated IR LED; 100 ms ALS integration; supports 100/200 mA IR drive; different interrupt architecture (no persistency configuration) | Includes onboard IR LED, eliminating external component count but limiting optical design flexibility and thermal management options | Choose TMD26721 when board space is critical and integrated LED placement is acceptable; avoid when custom IR LED selection or thermal isolation is required. |
Compared with VEML3235 and TMD26721, the ISL29028IROZ-T7 offers unique configurability in IR drive amplitude, ALS range selection, and interrupt persistency-enabling precise tuning for variable optical paths and power budgets in portable electronics.
Availability
ISL29028IROZ-T7 is available at Aetrix Electronics and suitable for smartphone display management, laptop keypad backlight control, and industrial HMI panel dimming requiring stable component supply and long-term production continuity.
Supply support for ISL29028IROZ-T7 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
Renesas Electronics Corporation acquired Intersil in 2017 and maintains its precision analog and sensor portfolio. Renesas is a global semiconductor leader focused on microcontrollers, analog, power, and connectivity solutions.
The ISL29028IROZ-T7 belongs to Renesas' optical sensor product line, designed specifically for power-efficient, flicker-immune ambient light and proximity sensing in battery-powered consumer and industrial devices.
FAQ
What is the operating voltage range for the ISL29028IROZ-T7?
The ISL29028IROZ-T7 operates from 2.25 V to 3.63 V on its VDD supply pin for the sensor core and internal circuitry. Its I²C interface (SCL/SDA) accepts voltages from 1.7 V to 3.63 V, allowing interoperability with lower-voltage controllers. Operation outside this range may cause functional failure or damage.
How does the ISL29028IROZ-T7 reject 50 Hz and 60 Hz light flicker?
The ISL29028IROZ-T7 uses a 100 ms integration time for its 12-bit ambient light ADC, which corresponds to exactly 5 cycles of 50 Hz and approximately 6 cycles of 60 Hz light modulation. This integer-multiple sampling inherently cancels periodic AC noise through charge-balancing integration, eliminating the need for external filtering.
Can the ISL29028IROZ-T7 measure infrared light independently of ambient light?
Yes. By setting the ALSIR_MODE bit (Register 0x01, bit 0) to 1 while enabling ALS_EN, the ISL29028IROZ-T7 configures its ALS ADC to digitize infrared-only photodiode current instead of visible light. The resulting 12-bit output is unitless digital counts proportional to incident IR intensity, useful for IR spectrum analysis or non-visible light monitoring.
What is the function of the REXT pin on the ISL29028IROZ-T7?
The REXT pin on the ISL29028IROZ-T7 connects to a 499 kΩ ±1% resistor tied to GND. This resistor sets the internal reference voltage (0.51 V) and determines the gain and full-scale range of both the ALS and proximity ADCs. Omitting or misvaluing this resistor causes inaccurate lux and proximity measurements.
How does the interrupt persistency feature work on the ISL29028IROZ-T7?
The ISL29028IROZ-T7 allows independent configuration of ALS and proximity interrupt persistency via ALS_PRST and PROX_PRST bits (Register 0x02). Setting these bits to 00, 01, 10, or 11 requires 1, 4, 8, or 16 consecutive out-of-threshold measurements before asserting the INT pin, preventing false triggers from transient noise or brief object presence.
ISL29028IROZ-T7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Ambient
- Wavelength:
- -
- Proximity Detection:
- Yes
- Output Type:
- I2C
- Voltage - Supply:
- 2.25V ~ 3.63V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-ODFN (2.1x2)
ISL29028IROZ-T7 FAQ
1.How can I place an order for ISL29028IROZ-T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL29028IROZ-T7 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 ISL29028IROZ-T7 reliable?
The price and inventory of ISL29028IROZ-T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL29028IROZ-T7 is usually 5 days.
3.What payment methods are accepted for ISL29028IROZ-T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL29028IROZ-T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL29028IROZ-T7?
ISL29028IROZ-T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL29028IROZ-T7 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 ISL29028IROZ-T7?
For technical support, including ISL29028IROZ-T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL29028IROZ-T7 requirements.
6.How does Aetrix verify that ISL29028IROZ-T7 is sourced from the original manufacturer or authorized distributors?
All ISL29028IROZ-T7 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 ISL29028IROZ-T7 meets industry standards.
7.What is the process for return or replacement of ISL29028IROZ-T7?
All ISL29028IROZ-T7 units undergo pre-shipment inspection (PSI). If there is an issue with ISL29028IROZ-T7, 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 ISL29028IROZ-T7 part is unused and in its original packaging.
Return procedure for ISL29028IROZ-T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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