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NXP Semiconductors PCA9922PW,112
- Part No.:
- PCA9922PW,112
- Manufacturer:
- NXP Semiconductors
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
PCA9922PW,112.pdf
- Description:
- IC LED DRVR LIN PWM 60MA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,283
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Product details
Overview
The PCA9922PW,112 from NXP Semiconductors is an 8-channel low-side constant current LED driver IC designed for serially controlled signage and display systems. It delivers adjustable output current (15–60 mA per channel) via external REXT, supports 25 MHz SPI-compatible serial interface (SDI/CLK/SDO), provides per-channel open-circuit and short-to-ground error detection, and operates across −40 °C to +85 °C. It is used in monochrome LED traffic signs where precise current matching and fault visibility are critical.
For engineers reviewing the PCA9922PW,112 datasheet, PCA9922PW,112 pinout, PCA9922PW,112 application, or PCA9922PW,112 equivalent, this page delivers verified technical context, validated pin functions for TSSOP16, real-world application constraints, and two confirmed functional alternatives with documented differences in error data polarity and package compatibility.
Technical Context
The PCA9922PW,112 implements an 8-bit shift register cascaded with parallel latches to convert high-speed serial input (up to 25 MHz) into 8-bit parallel LED control. Its constant-current sinks feature ±6% bit-to-bit matching at 25 °C and VDD = 5.0 V, with global current scaling set by a single external resistor.
Error detection operates via three timed sequences-Enter, Capture, and Exit-using CLK, LE, and OE edges. During Capture, OE held LOW ≥3 clocks loads fault status (1 = open/short, 0 = normal) into the shift register; SDO then outputs the 8-bit result on falling CLK edges, enabling daisy-chained readout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 8 independent low-side constant-current sinks, each programmable 15–60 mA via REXT |
| Serial interface speed | 25 MHz max clock frequency-enables >200 kSPS update rate for full 8-bit frame |
| Current matching | ±6% bit-to-bit, ±10% chip-to-chip-ensures uniform LED brightness across segments |
| Error detection coverage | Detects LED open-circuit and output short-to-ground per channel; status readable via SDO |
| Supply voltage range | 3.3 V to 5.5 V-supports direct interfacing with 3.3 V microcontrollers and 5 V LED strings |
| Operating temperature | −40 °C to +85 °C industrial grade-validated for outdoor signage and transportation displays |
| ESD protection | 2000 V HBM, 200 V MM, 1000 V CDM-meets JESD22-A114/A115/C101 for robust board-level handling |
Pinout & Package
TSSOP16 package (SOT403-1): 4.4 mm body width, 0.65 mm lead pitch, thermally enhanced for continuous 8-channel drive at 60 mA/channel. Pin 1 index located at top-left corner when notch faces up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS (Pin 1) | Power ground | Primary supply return; must be low-impedance connection to PCB ground plane |
| SDI (Pin 2) | Serial data input | Accepts rising-edge-clocked data; connects to MCU MOSI or upstream SDO in cascade |
| CLK (Pin 3) | Serial clock input | Drives internal shift register; max 25 MHz; timing critical for error detect sequences |
| LE/DM1 (Pin 4) | Latch enable / Detection Mode 1 | Active-HIGH latch strobe; internal 100–400 kΩ pull-down; timing-sensitive for error entry |
| LED0–LED7 (Pins 5–12) | Constant-current output sinks | Low-side drivers; each sources current through external LED anode to VDD |
| OE/DM2 (Pin 13) | Output enable / Detection Mode 2 | Active-LOW global output gate; internal 150–600 kΩ pull-up; controls all 8 channels simultaneously |
| SDO (Pin 14) | Serial data output | Shifts out data on falling CLK edge; enables daisy-chain of multiple PCA9922 devices |
| REXT (Pin 15) | Current reference input | Analog input setting full-scale current; 470 Ω → ~38 mA, 910 Ω → ~19.5 mA (VDD = 5 V) |
| VDD (Pin 16) | Supply voltage | 3.3–5.5 V power rail; decoupling capacitor (10 µF) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Gradual turn-on/turn-off | Edge-rate-controlled current transitions limit EMI during LED switching in dense display arrays |
| Open-circuit detection | Compares actual output current IO against 0.5×IO(target); requires channel ON to trigger |
| Short-circuit detection | Monitors output voltage VO vs. 2.4–2.6 V threshold; detects LED short or wiring fault |
| Cascadable architecture | SDO-to-SDI chaining allows unlimited expansion of LED channels without additional MCU pins |
| Thermal performance | TSSOP16 package achieves 160 °C/W junction-to-ambient-supports sustained 60 mA/channel at +85 °C |
Applications
| Full-Color LED Billboards | Traffic Signal Displays |
|---|---|
Use Scenario: Outdoor large-format video walls using RGB LED modules with pixel-level brightness control. IC Role / Device Role / Timing Role: PCA9922PW,112 acts as column driver in multiplexed scan architecture, sinking current from red/green/blue LEDs per pixel. Use Value: ±6% current matching ensures consistent color balance across thousands of pixels; 25 MHz interface enables real-time video refresh without visible flicker. |
Use Scenario: Red/amber/green signal heads in municipal traffic intersections exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: PCA9922PW,112 serves as fault-aware segment driver for alphanumeric LED signs, enabling remote diagnostics. Use Value: Open-circuit detection identifies failed LEDs before complete sign outage; −40 °C to +85 °C rating ensures reliability in unheated enclosures. |
| Commercial Digital Signage | Transportation Information Boards |
Use Scenario: Indoor retail signage with dynamic content requiring smooth dimming and long-term luminance stability. IC Role / Device Role / Timing Role: PCA9922PW,112 provides PWM-compatible constant-current drive synchronized to master controller timing. Use Value: External REXT tuning allows factory calibration to compensate for LED binning; thermal design supports 24/7 operation. |
Use Scenario: Highway variable message signs (VMS) displaying real-time travel alerts under direct sunlight and rain exposure. IC Role / Device Role / Timing Role: PCA9922PW,112 drives high-brightness monochrome LED segments with built-in short-circuit protection. Use Value: Short-to-ground detection prevents catastrophic failure from moisture ingress or mechanical damage to LED wiring harnesses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel constant current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STP08CDC596 | Error status bits are non-inverted; PCA9922PW,112 outputs inverted fault codes (1 = error, 0 = normal) | Requires firmware logic inversion when reading SDO during error capture sequence | Select STP08CDC596 if existing software expects native-polarity fault reporting and pinout compatibility is required |
| ST2221A | Same pinout and functional behavior as PCA9922PW,112 except error data polarity; also rated −40 °C to +85 °C | Drop-in replacement for legacy ST2221A designs; no PCB change needed but firmware must handle inverted error bits | Choose ST2221A only for direct migration from prior ST2221A-based hardware; verify error-handling code compatibility |
Compared with STP08CDC596 and ST2221A, the PCA9922PW,112 offers identical TSSOP16 footprint and 25 MHz interface but mandates firmware-level inversion of SDO-read error bits-making it suitable for new designs prioritizing NXP's long-term supply assurance over legacy code reuse.
Availability
PCA9922PW,112 is available at Aetrix Electronics and suitable for LED signage, traffic signal displays, and commercial digital signage requiring stable component supply, extended temperature operation, and integrated fault diagnostics.
Supply support for PCA9922PW,112 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 company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The PCA9922PW,112 belongs to NXP's LED driver product line, engineered specifically for high-reliability, serially controlled LED signage systems demanding precise current regulation, thermal resilience, and real-time fault visibility.
FAQ
What is the maximum clock frequency supported by the PCA9922PW,112 serial interface?
The PCA9922PW,112 supports a maximum serial clock frequency of 25 MHz, enabling high-throughput data loading for fast-refresh LED displays. This specification is validated across the full −40 °C to +85 °C operating range and applies to both normal operation and error detection mode timing sequences.
How does the PCA9922PW,112 implement open-circuit detection for LED outputs?
The PCA9922PW,112 detects open-circuit conditions by comparing the actual output current IO against a threshold of 0.5 × IO(target). This check only executes when the channel is actively enabled (logic HIGH in latch); the resulting fault bit is stored and read via SDO after executing the Capture Fault sequence.
Can multiple PCA9922PW,112 devices be connected in series, and how does cascading work?
Yes-PCA9922PW,112 supports daisy-chaining via SDO-to-SDI connections. Data shifted into the first device's SDI propagates through each SDO to the next SDI. The final SDO outputs the combined fault or configuration data, requiring 8 × N clocks to read N devices' status.
What external component sets the output current for the PCA9922PW,112, and what range does it support?
A single external resistor (REXT) connected to Pin 15 sets the full-scale output current for all eight channels of the PCA9922PW,112. With VDD = 5.0 V, REXT = 470 Ω yields ~38 mA/channel, while REXT = 910 Ω yields ~19.5 mA/channel-covering the specified 15–60 mA range.
Does the PCA9922PW,112 provide protection against electrostatic discharge, and to what standard?
Yes-the PCA9922PW,112 features on-chip ESD protection exceeding 2000 V HBM (JESD22-A114), 200 V MM (JESD22-A115), and 1000 V CDM (JESD22-C101), ensuring robust handling during assembly and field operation in industrial LED display environments.
PCA9922PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 3.3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 5.5V
- Current - Output / Channel:
- 60mA
- Frequency:
- 25MHz
- Dimming:
- PWM
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
PCA9922PW,112 FAQ
1.How can I place an order for PCA9922PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA9922PW,112 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 PCA9922PW,112 reliable?
The price and inventory of PCA9922PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA9922PW,112 is usually 5 days.
3.What payment methods are accepted for PCA9922PW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA9922PW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA9922PW,112?
PCA9922PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA9922PW,112 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 PCA9922PW,112?
For technical support, including PCA9922PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA9922PW,112 requirements.
6.How does Aetrix verify that PCA9922PW,112 is sourced from the original manufacturer or authorized distributors?
All PCA9922PW,112 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 PCA9922PW,112 meets industry standards.
7.What is the process for return or replacement of PCA9922PW,112?
All PCA9922PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA9922PW,112, 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 PCA9922PW,112 part is unused and in its original packaging.
Return procedure for PCA9922PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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