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NXP Semiconductors PCA9634BS,118
- Part No.:
- PCA9634BS,118
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 20-VQFN Exposed Pad
- Datasheet:
-
PCA9634BS,118.pdf
- Description:
- IC LED DRVR PS I2C 25MA 20HVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,226
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Product details
Overview
PCA9634BS,118 from NXP Semiconductors is an 8-channel I²C-bus LED driver optimized for RGBA color mixing, featuring individual 256-step (8-bit) PWM at 97 kHz per channel and group PWM with programmable 24 Hz–10.73 s blinking or 190 Hz dimming. It supports totem-pole (25 mA sink / 10 mA source) or open-drain (25 mA sink) output configuration and operates from 2.3 V to 5.5 V - used in keypad backlights, status indicators, and RGB displays.
For engineers reviewing the PCA9634BS,118 datasheet, PCA9634BS,118 pinout, PCA9634BS,118 application, or PCA9634BS,118 equivalent, key selection considerations include its Fast-mode Plus (1 MHz) I²C interface, hardware addressability for up to 126 devices, software-reset capability, OE-driven hardware dimming/blinking synchronization, and HVQFN20 thermal-enhanced packaging for space-constrained LED control designs.
Technical Context
The PCA9634BS,118 integrates a 25 MHz internal oscillator (no external components required), noise-filtered SDA/SCL inputs, edge-rate-controlled outputs, and hot-insertion support. Its dual PWM architecture separates per-LED brightness (97 kHz, 0–99.6% duty cycle) from global timing (190 Hz dimming or 24 Hz–10.73 s blinking), enabling precise color mixing and coordinated visual effects without MCU intervention.
Control logic includes volatile register mapping (MODE1/MODE2, PWM0–PWM7, GRPPWM/GRPFREQ, LEDOUT0/LEDOUT1), Auto-Increment addressing modes, and four programmable I²C addresses (All Call + three Sub Call) for hierarchical bus management - all accessible via standard I²C write/read sequences with ACK/STOP-triggered output updates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| I²C Interface | Fm+ compliant up to 1 MHz; 30 mA SDA drive strength enables robust operation on high-capacitance buses (≤4000 pF). |
| LED Channels | 8 independent outputs; each configurable as off/on/individual PWM/group PWM mixed mode. |
| Individual PWM | 97 kHz fixed frequency; 256 linear steps (0%–99.6% duty cycle); sets per-LED brightness without flicker. |
| Group PWM | 190 Hz fixed dimming OR programmable blink period (24 Hz to 10.73 s); 256-step duty cycle control for synchronized effects. |
| Output Drive | Software-selectable: totem-pole (25 mA sink / 10 mA source @ 5 V) or open-drain (25 mA sink @ 5 V); 5.5 V tolerant. |
| Supply Range | 2.3 V to 5.5 V; supports single-supply operation across battery-powered and 3.3 V/5 V systems. |
| Operating Temp | −40 °C to +85 °C; qualified for industrial and consumer embedded applications. |
| Package | HVQFN20 (5 mm × 5 mm × 0.85 mm); thermally enhanced with exposed pad for PCB heat dissipation. |
Pinout & Package
HVQFN20 package with 20-terminal layout and exposed thermal pad (connected to VSS). Requires soldering of center pad to PCB thermal plane with vias for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A6 | Hardware address input | 7-bit slave address selection; enables up to 126 devices on same I²C bus (A0 = pin 19, A1 = pin 20, A2 = pin 1, etc.). |
| SDA | I²C bidirectional data line | Open-drain I/O with internal noise filter; supports Fm+ 1 MHz operation and hot insertion. |
| SCL | I²C clock input | Input with noise filter; synchronizes register access and output updates. |
| OE | Active-low output enable | Asynchronous hardware control: disables all outputs to defined state (1/high-Z/0) when HIGH; enables PWM-controlled outputs when LOW. |
| LED0–LED7 | LED driver outputs | Configurable totem-pole or open-drain; each drives up to 25 mA directly; 5.5 V tolerant. |
| VDD | Power supply | 2.3 V–5.5 V input; powers internal logic and output drivers. |
| VSS | Ground | Primary supply ground; must be connected to PCB ground plane and exposed thermal pad. |
Key Features
| Feature | Design Value |
|---|---|
| Fast-mode Plus I²C | 1 MHz bus speed with 30 mA SDA drive ensures reliable communication on dense, high-capacitance PCBs. |
| Dual PWM architecture | Independent 97 kHz per-channel brightness + programmable group timing avoids MCU overhead for blinking/dimming coordination. |
| Four-level I²C addressing | All Call (E0h), three Sub Call (E2h/E4h/E8h), and 126 hardware addresses enable scalable multi-device LED systems with minimal bus traffic. |
| Hardware OE synchronization | Active-low OE pin allows external clock-driven dimming or blinking across multiple PCA9634BS,118 devices without software coordination. |
| Thermal-enhanced HVQFN20 | 5×5 mm footprint with exposed pad supports higher continuous current in compact LED modules and handheld devices. |
| Robust power-up behavior | No glitch on power-up; internal POR and 25 MHz oscillator eliminate need for external timing components or reset ICs. |
Applications
| RGB Status Indicators | Keypad Backlight Control |
|---|---|
Use Scenario: Multi-color status feedback on industrial HMI panels using discrete red/green/blue LEDs. IC Role / Device Role / Timing Role: PCA9634BS,118 drives 8 channels independently to generate precise RGB combinations via individual PWM registers while applying uniform dimming via GRPPWM. Use Value: Eliminates microcontroller GPIO and timer resource usage; enables smooth color transitions and low-flicker illumination at 97 kHz. |
Use Scenario: Backlighting alphanumeric keypads in portable medical devices with variable ambient light adaptation. IC Role / Device Role / Timing Role: PCA9634BS,118 configures LED0–LED7 as grouped backlight sources, controlled by OE-driven external PWM for real-time brightness adjustment. Use Value: Hardware-synchronized dimming ensures consistent luminance across keys without firmware latency or frame tearing. |
| LED Display Segments | RGBA Color Mixing Modules |
Use Scenario: Driving 7-segment or dot-matrix LED displays in point-of-sale terminals requiring uniform segment intensity. IC Role / Device Role / Timing Role: PCA9634BS,118 uses LEDOUT0/LEDOUT1 to set all segments to "individual + group" mode, applying identical GRPPWM dimming across active segments. Use Value: Maintains consistent contrast ratio under varying power conditions via 2.3–5.5 V operation and rail-to-rail output compliance. |
Use Scenario: Embedded lighting modules for smart home devices requiring tunable white + accent color output. IC Role / Device Role / Timing Role: PCA9634BS,118 assigns R/G/B/A LEDs to separate channels (LED0–LED3), modulating each via PWM0–PWM3 while coordinating fade effects with GRPFREQ/GRPPWM. Use Value: Achieves <1% brightness step resolution (256×256 combinations) and flicker-free output critical for human-centric lighting applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59116IPWPR | 16-channel, 12-bit PWM (4096 steps); I²C up to 400 kHz; no group blink programming; open-drain only; 1.8–5.5 V supply. | Higher resolution but lacks programmable group blink timing; better for precision dimming over wide dynamic range, not synchronized visual effects. | Select TLC59116IPWPR when >256-step grayscale fidelity is required and group blinking is unnecessary. |
| IS31FL3728-QFLS4-TR | 28-channel, 8-bit PWM; 1.7–5.5 V; built-in auto-breathing engine; no hardware address pins; SPI/I²C dual interface. | Greater channel count and integrated breathing effects, but no OE pin for hardware sync and no Fm+ 1 MHz support. | Select IS31FL3728-QFLS4-TR for high-channel-count ambient lighting where SPI flexibility and auto-effects outweigh bus speed needs. |
Compared with TLC59116IPWPR and IS31FL3728-QFLS4-TR, the PCA9634BS,118 uniquely balances 8-channel control, Fm+ 1 MHz responsiveness, hardware-addressable scalability, and dedicated OE-driven synchronization - making it optimal for cost-sensitive, space-constrained RGB UIs requiring coordinated blinking/dimming without MCU load.
Availability
PCA9634BS,118 is available at Aetrix Electronics and suitable for keypad backlighting, RGB status indication, and LED display applications requiring stable component supply, thermal-efficient packaging, and industrial temperature range support.
Supply support for PCA9634BS,118 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in interface, power, and LED control ICs.
The PCA9634BS,118 belongs to NXP's Fm+ I²C LED driver product line, designed specifically for efficient, scalable, and flicker-free multi-color LED control in space- and power-constrained embedded systems.
FAQ
What is the maximum I²C bus speed supported by the PCA9634BS,118?
The PCA9634BS,118 supports Fast-mode Plus (Fm+) I²C operation up to 1 MHz. This is enabled by its 30 mA SDA output drive capability, which maintains signal integrity on buses with capacitance up to 4000 pF - significantly higher than standard Fast-mode (400 kHz) limits. The PCA9634BS,118 achieves this without external bus buffers or level shifters.
How does the OE pin function in the PCA9634BS,118, and can it be used for hardware dimming?
The OE (Output Enable) pin on the PCA9634BS,118 is an active-low control that globally enables or disables all LED outputs. When pulled HIGH, outputs enter a user-defined state (HIGH, LOW, or high-impedance) per MODE2 register settings. When driven with an external PWM signal, OE provides hardware-synchronized dimming or blinking across all channels - a feature confirmed in the PCA9634BS,118 datasheet Section 7.4.
Does the PCA9634BS,118 support both totem-pole and open-drain output configurations?
Yes, the PCA9634BS,118 supports software-selectable output types via the OUTDRV bit (bit 2) in MODE2 register. By default, outputs are configured as totem-pole (25 mA sink / 10 mA source at 5 V); setting OUTDRV = 0 configures them as open-drain (25 mA sink). This dual-mode capability allows direct LED driving or compatibility with external high-voltage/current drivers - explicitly documented for PCA9634BS,118 in Table 7 and Section 7.3.2.
What is the purpose of the GRPFREQ and GRPPWM registers in the PCA9634BS,118?
The GRPPWM register (address 0Ah) controls the duty cycle (0–99.6%) of the group PWM signal, while GRPFREQ (address 0Bh) sets its period - from 24 Hz to 10.73 s - when DMBLNK = 1 in MODE2. When DMBLNK = 0, GRPFREQ is ignored and GRPPWM acts as a 190 Hz global dimmer. These registers enable synchronized blinking or dimming across all 8 channels of the PCA9634BS,118 without individual register writes.
Can multiple PCA9634BS,118 devices share the same I²C bus, and how many can be addressed?
Yes, up to 126 PCA9634BS,118 devices can coexist on one I²C bus using their 7 hardware address pins (A0–A6). Additionally, software-configurable All Call (E0h) and three Sub Call (E2h/E4h/E8h) addresses allow grouped commands - e.g., updating all red LEDs simultaneously. This multi-address capability is fully specified for PCA9634BS,118 in Sections 7.1 and Table 1 of the datasheet.
PCA9634BS,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 20-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Power Switch
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 2.3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 5.5V
- Current - Output / Channel:
- 25mA
- Frequency:
- 25MHz
- Dimming:
- I2C
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HVQFN (5x5)
PCA9634BS,118 FAQ
1.How can I place an order for PCA9634BS,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9634BS,118 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 PCA9634BS,118 reliable?
The price and inventory of PCA9634BS,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9634BS,118 is usually 5 days.
3.What payment methods are accepted for PCA9634BS,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9634BS,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9634BS,118?
PCA9634BS,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9634BS,118 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 PCA9634BS,118?
For technical support, including PCA9634BS,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9634BS,118 requirements.
6.How does Aetrix verify that PCA9634BS,118 is sourced from the original manufacturer or authorized distributors?
All PCA9634BS,118 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 PCA9634BS,118 meets industry standards.
7.What is the process for return or replacement of PCA9634BS,118?
All PCA9634BS,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9634BS,118, 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 PCA9634BS,118 part is unused and in its original packaging.
Return procedure for PCA9634BS,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
PCA9634BS,118 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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