CAT9532HV6I - 16-Bit I2C LED Dimmer I/O Expander | onsemi
MPN： CAT9532HV6I ✓ 啟用中CAT9532HV6I 概覽
An LED driver I/O expander is a specialized interface IC that combines a general-purpose I/O port expander with constant-current or constant-voltage LED drive transistors on each bit. Within the broader semiconductor taxonomy, the CAT9532 sits in the LED driver subcategory of power management, with hypernyms: LED driver -> display driver -> power management IC -> semiconductor. The integrated dimming logic offloads PWM generation from the host MCU, reducing firmware complexity and freeing timer resources for other tasks.
Key features include 16 independently controlled LED drivers with 256 brightness levels, two programmable blink rates, hardware address pins that allow up to four devices on the same I2C bus, and a wide operating supply range suitable for 3 V and 5 V systems. The device also functions as a general-purpose 16-bit I/O expander when LED dimming is not required, providing bidirectional GPIOs with interrupt capability.
Architecturally, the CAT9532 integrates CMOS output drivers with a programmable PWM/FSK engine, an I2C-compatible slave interface, and configurable registers per channel. The 4x4 mm TQFN package provides a low thermal-resistance path and supports compact PCB designs for space-constrained backlight, indicator, and RGB lighting modules.
Typical applications include RGB LED backlighting in handheld and industrial displays, status-indicator panels, keypad backlights, decorative color-mixing lighting, and any 3 V/5 V system that needs up to 16 individually dimmed LEDs. Each output can also serve as a standard GPIO when the LED function is disabled, adding flexibility for mixed-signal designs.
When designing with the CAT9532, ensure that the per-channel current setting resistors are chosen based on the LED forward voltage and supply rail. The HVQCCN exposed pad should be soldered to a sufficient copper area for thermal dissipation when multiple channels operate near 25 mA simultaneously.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 CAT9532HV6I — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： CAT9532HV6I （相同外形與佔位） — 差異在於 Package, Interface, Device Type.
CAT9532HV6I-GT2
✅ 直接替換聯絡詢價
查看資料表 →PCA9532BS
✅ 直接替換聯絡詢價
查看資料表 →TCA9532
✅ 直接替換📋 參考替代品（不在目錄中）
CAT9532HV6I-G
✅ 直接替換📋 參考替代品（不在目錄中）
CAT9534HV4I
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
CAT9532HV6I 最大額定值與電氣特性
| Device Type | 16-bit I/O Port Expander with LED Dimming |
| 輸出數量 | 16 |
| 介面 | I2C / SMBus |
| LED Current per Channel | 25 mA |
| Dimming Steps | 256 brightness levels |
| Blink Rates | 2 programmable |
| 工作溫度 | -40 C to +85 C |
| Technology | CMOS |
| 封裝 | 24-TQFN (HVQCCN) 4x4 mm |
| 安裝類型 | Surface Mount |
| MSL 等級 | 1 |
| 無鹵素 | Yes |
| BFR Free | Yes |
| RoHS 狀態 | Compliant |
| Hardware Address Pins | 2 (up to 4 devices on bus) |
CAT9532HV6I 腳位配置
| 腳位 1 | LED0 — LED output 0 / GPIO bit 0 |
| 腳位 2 | LED1 — LED output 1 / GPIO bit 1 |
| 腳位 3 | LED2 — LED output 2 / GPIO bit 2 |
| 腳位 4 | LED3 — LED output 3 / GPIO bit 3 |
| 腳位 5 | LED4 — LED output 4 / GPIO bit 4 |
| 腳位 6 | LED5 — LED output 5 / GPIO bit 5 |
| 腳位 7 | LED6 — LED output 6 / GPIO bit 6 |
| 腳位 8 | LED7 — LED output 7 / GPIO bit 7 |
| 腳位 9 | INT — Interrupt output (active low, open-drain) |
| 腳位 10 | SCL — I2C serial clock |
| 腳位 11 | SDA — I2C serial data |
| 腳位 12 | A0 — Hardware address input 0 |
| 腳位 13 | A1 — Hardware address input 1 |
| 腳位 14 | RESET — Active-low reset input |
| 腳位 15 | VSS — Ground |
| 腳位 16 | VDD — Positive supply voltage |
| 腳位 17 | LED8 — LED output 8 / GPIO bit 8 |
| 腳位 18 | LED9 — LED output 9 / GPIO bit 9 |
| 腳位 19 | LED10 — LED output 10 / GPIO bit 10 |
| 腳位 20 | LED11 — LED output 11 / GPIO bit 11 |
| 腳位 21 | LED12 — LED output 12 / GPIO bit 12 |
| 腳位 22 | LED13 — LED output 13 / GPIO bit 13 |
| 腳位 23 | LED14 — LED output 14 / GPIO bit 14 |
| 腳位 24 | LED15 — LED output 15 / GPIO bit 15 |
典型應用
CAT9532HV6I 適用於 6 應用s: RGB LED Backlighting for Handheld Displays, Industrial Status Indicator Panels, Keypad and Button Backlights, Decorative Color-Mixing Lighting, Automotive Interior LED Lighting, General-Purpose 16-bit I/O Expansion.
RGB LED Backlighting for Handheld Displays
The CAT9532HV6I drives up to 16 LEDs at 25 mA per channel with 256 brightness steps, making it ideal for RGB backlighting in handheld industrial and consumer displays. The 256-step PWM resolution enables smooth color-mixing transitions without visible flicker, while the I2C interface keeps the host MCU free of timer interrupts. Placed near the LCD module with per-LED series resistors sized for the chosen LED forward voltage, the CAT9532HV6I provides a compact, firmware-light solution for backlight dimming and color-mixing. The 24-TQFN 4x4 mm package fits beneath the display bezel.
推薦
Industrial Status Indicator Panels
The CAT9532HV6I's 16 outputs and industrial -40 to +85 C temperature range suit it to multi-LED status-indicator panels in factory automation and process-control equipment. Each LED can be independently dimmed or blinked at one of two programmable rates, providing clear visual feedback for alarms, status, and operator notifications. Two hardware address pins let four CAT9532HV6I devices share one I2C bus, controlling up to 64 LEDs from a single MCU. The 24-TQFN package withstands typical industrial thermal cycling and supports standard reflow profiles.
推薦
Keypad and Button Backlights
For capacitive or mechanical keypad backlights, the CAT9532HV6I provides per-key LED dimming with 256 brightness steps for uniform illumination under varying ambient light. The interrupt-on-change feature on unused GPIO inputs can wake the host when a key event occurs, sharing the I2C bus with the dimming function to reduce pin count. With up to four devices on the bus, a 64-key backlit keypad matrix is achievable from one MCU I2C peripheral, simplifying layout and firmware. The 24-TQFN 4x4 mm footprint fits beneath dense keypad assemblies.
推薦
Decorative Color-Mixing Lighting
The CAT9532HV6I's 256-step dimming resolution and I2C control make it well suited for decorative color-mixing fixtures using RGB or RGBW LED arrays. Designers can store up to 256 brightness levels per channel in firmware-driven look-up tables, then stream dimming values over I2C for smooth color fades and breathing effects without host-side PWM. With 16 channels per chip and four chips per bus, a single MCU can orchestrate 64-channel fixtures. The compact 24-TQFN 4x4 mm package fits into space-constrained lamp enclosures.
推薦
Automotive Interior LED Lighting
For non-safety interior LED lighting such as footwell, door-panel, and ambient mood lighting, the CAT9532HV6I provides 16 dimmable outputs that interface directly to the vehicle's I2C bus. The -40 to +85 C operating range covers cabin temperatures, and the RoHS-compliant 24-TQFN 4x4 mm package is suitable for typical automotive PCB assemblies. For safety-critical or under-hood AEC-Q100 requirements, onsemi offers qualified variants within the same family footprint. Each channel drives indicator-class LEDs at up to 25 mA with smooth PWM dimming.
推薦
General-Purpose 16-bit I/O Expansion
When LED dimming is not needed, the CAT9532HV6I serves as a versatile 16-bit bidirectional GPIO expander with interrupt-on-change capability. The I2C interface adds up to 16 inputs or outputs to a host MCU with limited pin count - useful in sensor hubs, control panels, and mixed-signal embedded designs. The same 24-TQFN 4x4 mm footprint keeps layout identical whether the design uses LED mode or GPIO mode, providing design reuse. The two hardware address pins allow four devices per bus for 64 total GPIOs from one MCU peripheral.
推薦
推薦產品摘要
工程參考資料，適用於 CAT9532HV6I — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | CAT9532HV6I-GT2 | PCA9532BS | TCA9532 | CAT9532HV6I-G | CAT9534HV4I |
|---|---|---|---|---|---|---|
| Package | 24-TQFN (HVQCCN) 4x4 mm | 24-TQFN (HVQCCN) 4x4 mm - same | 24-TQFN 4x4 mm - same | 24-TQFN (RTW) 4x4 mm - same | 24-TQFN 4x4 mm - same | 24-TQFN 4x4 mm - same |
| Brand | onsemi | onsemi | NXP Semiconductors | Texas Instruments | onsemi | onsemi |
| Number of LED Outputs | 16 | 16 | 16 | 16 | 16 | 8 (different family) |
| LED Current per Channel | 25 mA | 25 mA | 25 mA | 25 mA | 25 mA | 25 mA |
| Dimming Steps | 256 | 256 | 256 | 256 | 256 | 256 |
| Interface | I2C / SMBus | I2C / SMBus | I2C / SMBus | I2C / SMBus | I2C / SMBus | I2C / SMBus |
| Hardware Address Pins | 2 (4 devices/bus) | 2 (4 devices/bus) | 2 (4 devices/bus) | 2 (4 devices/bus) | 2 (4 devices/bus) | 2 (4 devices/bus) |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
主要差異化特點
- Industry-standard 16-channel LED dimmer I/O expander with broad cross-brand second-source support (對比Discrete MCU PWM + MOSFET approach)
- Drop-in pin compatibility with NXP PCA9532 and TI TCA9532 in same 24-TQFN 4x4 mm package (對比NXP PCA9532BS)
- Industrial -40 to +85 C operating range in halogen-free / RoHS-compliant 24-TQFN (對比Commercial-grade LED driver ICs)
設計說明
When all 16 CAT9532HV6I outputs drive 25 mA simultaneously, total package dissipation approaches 0.6 W at 1.5 V LED forward drop plus driver losses. The 24-TQFN 4x4 mm HVQCCN package has a low thermal resistance to the exposed die pad; solder this pad to a copper pour of at least 25 mm^2 on the top or bottom PCB layer to keep junction temperature within the -40 to +85 C range. For full-load operation above +60 C ambient, derate to 20 mA per channel.
Place the I2C pull-up resistors (typically 4.7 kohm at 3.3 V or 3.3 kohm at 5 V) close to the CAT9532HV6I SDA and SCL pins. Decouple VDD with a 0.1 uF ceramic capacitor placed within 3 mm of pin 16, plus a bulk 1 uF capacitor for noise immunity. Series resistors on each LED output sized for (VDD - Vf_LED) / 25 mA ensure uniform brightness across channels.
Do not exceed the absolute maximum LED current of 25 mA per channel; doing so risks permanent damage to the open-drain output transistors. The INT pin is open-drain and requires a pull-up resistor to VDD. A0 and A1 hardware address inputs must be tied to either VSS or VDD - leaving them floating can cause intermittent I2C addressing errors. Always issue a software reset (or assert RESET pin low for >1 us) after power-up before writing to configuration registers.
合規資訊
RoHS compliant, halogen-free, BFR-free per onsemi CAT9532 product page. Industrial temperature grade -40 to +85 C. Not AEC-Q100 qualified; for safety-critical automotive applications use onsemi automotive-qualified variants within the same family.
