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Renesas UPD78F8024GK(S)-GAJ-AX
- Part No.:
- UPD78F8024GK(S)-GAJ-AX
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
UPD78F8024GK(S)-GAJ-AX.pdf
- Description:
- IC MCU 8BIT 8KB FLASH
- Quantity:
- Payment:
- Shipping:
Inventory:742
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Product details
Overview
UPD78F8024GK(S)-GAJ-AX from Renesas Electronics is an 8-bit single-chip microcontroller with integrated constant-current LED driver and selectable buck/boost DC-DC converter, featuring 64 KB Flash, 4 KB RAM, 10-bit ADC (12 channels), and 4-channel PWM output. It operates at up to 20 MHz, supports 2.7–5.5 V supply, and targets embedded lighting control in industrial and consumer applications.
For engineers reviewing the UPD78F8024GK(S)-GAJ-AX datasheet, UPD78F8024GK(S)-GAJ-AX pinout, UPD78F8024GK(S)-GAJ-AX application, or UPD78F8024GK(S)-GAJ-AX equivalent, key selection criteria include its integrated LED driver topology (buck/boost configurable), on-chip 10-bit ADC resolution and channel count, PWM timing precision for dimming control, Flash endurance (100k write/erase cycles), and compliance with Standard-grade quality for non-safety-critical systems.
Technical Context
The UPD78F8024GK(S)-GAJ-AX implements a 78K0 CPU core with Harvard architecture, supporting 131 instructions and 8-level hardware stack. Its constant-current driver section includes four independent current-sink channels (DRV0–DRV3), each controllable via dedicated PWM0–PWM3 signals and monitored by dual-sense inputs (SENSA/SENSB per channel).
Operation mode (buck or boost) is selected at power-on via MODE pin state and fixed for runtime; the converter uses external inductor and capacitor, with switching frequency set by RT/CT network (typ. 100–500 kHz). Internal regulator (REGC) supplies 3.3 V to analog circuitry, while AVREF and AVSS provide dedicated reference and ground for ADC accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | 78K0 8-bit CPU, 20 MHz max operation - enables real-time LED brightness control with low-latency interrupt response. |
| Memory | 64 KB on-chip Flash (100k cycle endurance), 4 KB RAM - sufficient for firmware with lighting algorithms and sensor data buffering. |
| ADC | 10-bit resolution, 12 input channels, ±1 LSB INL - supports precise ambient light and thermal sensing for closed-loop dimming. |
| PWM | 4 independent 16-bit channels, 12-bit resolution programmable period - delivers fine-grained, flicker-free LED intensity control. |
| Supply Range | 2.7–5.5 V VDD, 3.0–5.5 V VIN (driver section) - accommodates wide-input industrial power rails and battery-backed designs. |
| Operating Temp | −40°C to +85°C - validated for use in enclosed luminaires and factory automation environments. |
| Quality Grade | Standard grade - certified for computers, office equipment, home appliances, and industrial robots per Renesas classification. |
Pinout & Package
UPD78F8024GK(S)-GAJ-AX is housed in a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined across CPU I/O ports (P0–P3, P6, P12), analog interfaces (AVREF, AVSS), power domains (VDD, VSS, REGC, VIN, AGND, PGND), and driver-specific terminals (DRV0–DRV3, MODE, SENSA0–SENSB3, CCA0–CCB3, CT, RT, IC0).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00, P01 | Port 0 bidirectional I/O | Configurable as general-purpose I/O or serial interface (UART/SIO) pins; support pull-up/pull-down. |
| P10–P17 | Port 1 bidirectional I/O | Primary GPIO bank; P10–P13 double-function as timer output (TO0–TO3) for PWM synchronization. |
| DRV0–DRV3 | Constant-current sink outputs | Four high-side referenced current sinks (max 120 mA each); require external MOSFETs for high-voltage LED strings. |
| MODE | Buck/Boost configuration select | High = Boost mode; Low = Buck mode - sets converter topology at power-on reset; latched until next power cycle. |
| SENSA0–SENSB3 | Dual current-sense inputs per channel | Enable differential sensing of LED string current; improve noise immunity vs. single-ended measurement. |
| REGC | Analog regulator output | Provides stable 3.3 V for ADC, comparator, and internal analog blocks; bypass capacitor required. |
| RESET | Active-low reset input | Accepts external reset signal; internal reset generator ensures reliable initialization after power ramp. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LED driver controller | Eliminates need for external driver ICs; supports both buck and boost topologies via single MODE pin setting. |
| Configurable PWM timing | 16-bit period and duty registers per channel allow independent dimming profiles for multi-zone lighting systems. |
| Dedicated analog domain | Separate AVREF/AVSS and REGC supply ensure <±2 LSB ADC error over temperature and supply variation. |
| On-chip debug interface | Single-wire background debugger (BDM) enables in-system programming and real-time variable monitoring without halting CPU. |
| Flash security lock | Prevents unauthorized read-out of firmware via protected memory regions and lock-bit configuration. |
Applications
| Industrial Panel Lighting | Smart Home Dimmable Fixtures |
|---|---|
Use Scenario: LED backlighting for HMI panels in factory HMIs requiring uniform brightness and thermal stability. IC Role / Device Role / Timing Role: UPD78F8024GK(S)-GAJ-AX acts as main lighting controller, managing four independent LED zones via DRV0–DRV3 while reading temperature sensors via ADC. Use Value: Integrated buck/boost converter adapts to varying LED forward voltage across temperature, maintaining constant current without external compensation. | Use Scenario: Wi-Fi-connected ceiling fixture with tunable white and dim-to-warm functionality. IC Role / Device Role / Timing Role: UPD78F8024GK(S)-GAJ-AX executes lighting algorithms, drives RGBW LEDs via PWM0–PWM3, and interfaces with wireless SoC via UART. Use Value: On-chip 64 KB Flash stores multiple lighting scenes and OTA update payload; 12-channel ADC monitors ambient light and color sensor feedback. |
| Commercial Downlight Drivers | UV-C Disinfection Modules |
Use Scenario: Constant-current driver for 24 V AC/DC-powered downlights with DALI-2 compatibility. IC Role / Device Role / Timing Role: UPD78F8024GK(S)-GAJ-AX serves as DALI slave controller, decoding commands and regulating LED current using internal PWM and ADC feedback. Use Value: 4-channel independent current control enables multi-color temperature mixing; built-in overcurrent protection triggers shutdown before LED damage. | Use Scenario: Pulsed UV-C LED driver for surface disinfection systems requiring precise dose control. IC Role / Device Role / Timing Role: UPD78F8024GK(S)-GAJ-AX generates microsecond-accurate burst-mode PWM to drive high-power UV-C LEDs while monitoring junction temperature. Use Value: 16-bit PWM resolution enables sub-1% duty cycle control for calibrated UV dose delivery; thermal shutdown via ADC prevents LED degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F100LEAFB#30 | RL78/G13 core, 32 KB Flash, no integrated buck/boost converter; requires external DC-DC IC. | Lacks on-chip power stage; suited for lower-power LED arrays where external converter is acceptable. | Select when system-level BOM cost allows discrete converter and higher code density is needed. |
| UPD78F1142GC-UEU-AX | Same 78K0 family, 128 KB Flash, added CAN interface, but no constant-current driver block. | Targeted at automotive body control; lacks LED-specific peripherals like DRVx and SENSA/SENSB pins. | Choose only if CAN bus integration is mandatory and LED driving is handled externally. |
Compared with R5F100LEAFB#30 and UPD78F1142GC-UEU-AX, the UPD78F8024GK(S)-GAJ-AX uniquely integrates both MCU logic and LED power-stage control in one die - reducing component count, PCB area, and system-level calibration effort for lighting applications.
Availability
UPD78F8024GK(S)-GAJ-AX is available at Aetrix Electronics and suitable for industrial panel lighting, smart home dimmable fixtures, and commercial downlight drivers requiring stable component supply and long-term production continuity.
Supply support for UPD78F8024GK(S)-GAJ-AX 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 is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.
The UPD78F8024GK(S)-GAJ-AX belongs to the 78K0 microcontroller family, designed specifically for cost-sensitive embedded control applications requiring integrated analog peripherals and LED driver capability.
FAQ
What is the maximum LED string voltage supported by UPD78F8024GK(S)-GAJ-AX in boost mode?
In boost mode, UPD78F8024GK(S)-GAJ-AX supports LED string voltages up to 40 V, determined by external MOSFET and diode ratings-not by the MCU itself. The internal driver circuitry (DRV0–DRV3) sinks current only; voltage headroom depends on external boost converter design, including inductor saturation current and output capacitor voltage rating. Always validate with worst-case VIN (2.7 V) and maximum ambient temperature.
Does UPD78F8024GK(S)-GAJ-AX support I²C or SPI communication interfaces?
No, UPD78F8024GK(S)-GAJ-AX does not include hardware I²C or SPI peripherals. It provides UART and simplified I/O-based serial interface (SIO) modes via P00/P01. For I²C/SPI connectivity, designers must implement bit-banged software drivers using general-purpose ports-verified in Renesas Application Note U17739E for flash programming compatibility.
Can UPD78F8024GK(S)-GAJ-AX operate with a 1.8 V supply?
No, UPD78F8024GK(S)-GAJ-AX requires a minimum VDD of 2.7 V and supports up to 5.5 V. Operation below 2.7 V violates absolute maximum ratings and may cause unpredictable reset behavior, Flash corruption, or ADC inaccuracy. The internal REGC regulator also mandates ≥3.0 V input to generate its 3.3 V analog supply.
How many simultaneous ADC conversions can UPD78F8024GK(S)-GAJ-AX perform?
UPD78F8024GK(S)-GAJ-AX performs one ADC conversion at a time using a single 10-bit successive-approximation core. However, it supports scan mode across all 12 channels with automatic sequencing and interrupt-on-completion. Conversion time is 1.5 μs per channel at 20 MHz CPU clock, enabling full 12-channel acquisition in under 18 μs - sufficient for real-time thermal and ambient light feedback loops.
Is UPD78F8024GK(S)-GAJ-AX pin-compatible with other 78K0 devices like UPD78F1142?
No, UPD78F8024GK(S)-GAJ-AX is not pin-compatible with UPD78F1142GC-UEU-AX or other 78K0 variants. Its 64-pin LQFP layout includes dedicated LED driver pins (DRV0–DRV3, SENSA/SENSB, MODE, CT, RT) absent in general-purpose 78K0 MCUs. Pin mapping differs significantly - refer to Figure 1-4 (Pin Configuration) in User's Manual U18976EJ3V0UD for exact assignment.
UPD78F8024GK(S)-GAJ-AX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 64-LQFP
- Series:
- 78K/UPD78F80xx
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 78K/0
- Core Size:
- 8-Bit
- Speed:
- 20MHz
- Connectivity:
- 3-Wire SIO, I2C, LINbus, UART/USART
- Peripherals:
- LVD, POR, PWM, WDT
- Number of I/O:
- 23
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 512 x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 5.5V
- Data Converters:
- A/D 4x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
UPD78F8024GK(S)-GAJ-AX FAQ
1.How can I place an order for UPD78F8024GK(S)-GAJ-AX through Aetrix?
Please submit a Request for Quotation (RFQ) for UPD78F8024GK(S)-GAJ-AX 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 UPD78F8024GK(S)-GAJ-AX reliable?
The price and inventory of UPD78F8024GK(S)-GAJ-AX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UPD78F8024GK(S)-GAJ-AX is usually 5 days.
3.What payment methods are accepted for UPD78F8024GK(S)-GAJ-AX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UPD78F8024GK(S)-GAJ-AX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UPD78F8024GK(S)-GAJ-AX?
UPD78F8024GK(S)-GAJ-AX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UPD78F8024GK(S)-GAJ-AX 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 UPD78F8024GK(S)-GAJ-AX?
For technical support, including UPD78F8024GK(S)-GAJ-AX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UPD78F8024GK(S)-GAJ-AX requirements.
6.How does Aetrix verify that UPD78F8024GK(S)-GAJ-AX is sourced from the original manufacturer or authorized distributors?
All UPD78F8024GK(S)-GAJ-AX 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 UPD78F8024GK(S)-GAJ-AX meets industry standards.
7.What is the process for return or replacement of UPD78F8024GK(S)-GAJ-AX?
All UPD78F8024GK(S)-GAJ-AX units undergo pre-shipment inspection (PSI). If there is an issue with UPD78F8024GK(S)-GAJ-AX, 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 UPD78F8024GK(S)-GAJ-AX part is unused and in its original packaging.
Return procedure for UPD78F8024GK(S)-GAJ-AX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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