PCA9536D - 4-Bit I2C GPIO Expander | Texas Instruments
料号： PCA9536D ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
PCA9536D 概述
An I2C GPIO expander is a semiconductor interface device that extends the number of digital input and output lines available from a host controller. PCA9536-family parts belong to the I/O expander hierarchy, connect through a two-wire I2C or SMBus-compatible interface, and are used for control, sensing, indicators, relays, and low-speed peripheral signaling.
The verified product information identifies the PCA9536 as a 4-bit I2C/SMBus I/O expander with a 400 kHz interface. Its 2.3 V to 5.5 V supply range supports both low-voltage embedded systems and conventional 5 V logic environments. The remote four GPIO lines reduce MCU pin count, particularly in compact designs where package area, connector routing, or exposed-pin limitations matter.
The PCA9536D uses configuration registers to define port direction and output behavior. Its I2C address is selected by hardware pins according to the manufacturer's datasheet, allowing multiple expanders to coexist on one bus. Bus pull-up resistors, address decoding, and appropriate decoupling should be verified in the final schematic and layout.
Typical uses include reading discrete switches, driving LEDs, monitoring external signals, and adding control lines to embedded products. The device is suited to industrial control, consumer electronics, portable equipment, and compact controller boards where a serial bus is already present and four deterministic GPIO lines are needed.
Designers should confirm pin orientation, address selection, pull-up placement, and reset or power-up requirements against the manufacturer documentation. Because the verified data does not provide current pricing, detailed electrical limits, pin names, or package drawings, those values are marked for verification rather than inferred.
直接替换替代料： PCA9536D ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
PCA9536DRG4
✅ 直接替换📋 参考替代料（不在目录中）
PCA9536D,118
✅ 直接替换📋 参考替代料（不在目录中）
PCA9536DGKRG4
✅ 直接替换📋 参考替代料（不在目录中）
PCA9536D,112
✅ 直接替换📋 参考替代料（不在目录中）
PCA9536DR
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
PCA9536D 规格参数
| Product Type | 4-bit I2C/SMBus GPIO expander |
| Number of GPIO Lines | 4 |
| Supply Voltage Range | 2.3 V to 5.5 V |
| I2C Bus Frequency | 400 kHz |
| 接口 | I2C/SMBus |
| Configuration Registers | Present |
| CMOS Device Type | 8-pin CMOS device |
| Input/Output Capability | General-purpose parallel input/output |
| 封装 | 8-SOIC |
| NXP Package | 8-SO |
| Manufacturer | Texas Instruments |
PCA9536D 8-so 引脚配置指南
PCA9536D（8-so 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： PCA9536D.
请参阅 数据手册 以查看完整引脚配置。
典型应用
PCA9536D 适用于 7 应用s: Embedded Control GPIO Expansion, Industrial Control and Monitoring, LED and Indicator Control, Switch and Discrete Signal Input, Consumer Electronics and Appliance Control, Instrumentation and Test Equipment, Compact IoT and Sensor Interface Boards.
Embedded Control GPIO Expansion
The PCA9536D fits compact embedded controllers that have reached their direct GPIO-pin limit but already communicate through I2C or SMBus. Its four parallel lines can be assigned for discrete control outputs or digital status inputs, reducing host pin pressure without adding a high-speed parallel bus. The verified 2.3 V to 5.5 V supply range supports both lower-voltage embedded rails and 5 V logic systems, while the listed 400 kHz interface is appropriate for ordinary control traffic rather than time-critical streaming.
推荐
Industrial Control and Monitoring
In industrial equipment, a four-bit expander can add status indicators, mode controls, alarm signals, or sensor-enable lines without consuming several MCU pins. The PCA9536D's I2C/SMBus interface allows a controller to update several lines through the serial bus, and its 2.3 V to 5.5 V operating range accommodates common control-rail combinations. For a factory design, verify the exact logic thresholds, isolation requirements, surge exposure, and long wiring behavior because those parameters are not supplied in the verified data.
推荐
LED and Indicator Control
The PCA9536D can provide a small, deterministic bank of LED or indicator-control outputs when the LED currents and voltage levels are within the device's verified operating requirements. Four lines are useful for status groups, mode indicators, or panel controls where the host already uses I2C. The designer must add the correct current-limiting network and verify output drive capability from the manufacturer datasheet; the supplied data confirms four GPIO lines but does not provide output-current limits.
推荐
Switch and Discrete Signal Input
A four-bit I/O expander is useful when a product needs extra switch, interlock, door, or mode inputs. The PCA9536D can read discrete signals over I2C, allowing the host firmware to debounce and interpret them centrally. The supplied data confirms a 4-bit I/O expander with I2C/SMBus communication, but it does not include input thresholds, hysteresis, leakage, or debounce timing; these must be established from the exact datasheet and the external signal network.
推荐
Consumer Electronics and Appliance Control
Consumer products often need several front-panel, mode, or indicator lines while prioritizing low host-pin count. The PCA9536D provides four lines through a compact 8-SOIC package, making it suitable for appliance controls, small consumer modules, and board-level interface expansion. Its 2.3 V to 5.5 V range can simplify compatibility between a low-voltage host and 5 V peripherals, but the actual mixed-voltage arrangement must be checked against input and output thresholds.
推荐
Instrumentation and Test Equipment
Instrumentation systems can use the PCA9536D to add front-panel controls, status outputs, or discrete measurement-support signals when the controller communicates over I2C. The four-line capacity is intentionally small, so it is most useful when the design needs a targeted set of signals rather than a full parallel interface. The listed 400 kHz bus rate should be checked against cable length, bus capacitance, pull-up resistance, and the number of connected peripherals before relying on it for external control lines.
推荐
Compact IoT and Sensor Interface Boards
The PCA9536D can supplement a small IoT controller with four low-speed GPIO lines for sensors, latches, status LEDs, or peripheral enables. Using I2C rather than direct MCU pins preserves board area and keeps the wiring organized, while the 2.3 V to 5.5 V range supports common low-power rails. In battery-powered products, account for the device's actual quiescent current and leakage from the exact datasheet, since those values are not present in the verified search data.
推荐
推荐产品汇总
工程参考数据： PCA9536D ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | PCA9536DRG4 | PCA9536D,118 | PCA9536DGKRG4 | PCA9536D,112 | PCA9536DR |
|---|---|---|---|---|---|---|
| Product Type | 4-bit I2C/SMBus GPIO expander | PCA9536-family GPIO expander | 4-bit I2C/SMBus I/O expander | PCA9536-family GPIO expander | PCA9536D-family 4-bit expander | PCA9536-family GPIO expander |
| Brand | Texas Instruments | Texas Instruments | NXP Semiconductors | Texas Instruments | NXP Semiconductors | Texas Instruments |
| Package | 8-SOIC | 8-SOIC | 8-SO | 8-SOIC package family; verify exact suffix | 8-SO | 8-SOIC |
| Number of GPIO Lines | 4 | 4-bit family | 4-bit | 4-bit family | 4-bit family | 4-bit family |
| Supply Voltage Range | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V family specification; verify suffix | 2.3 V to 5.5 V family specification; verify suffix | 2.3 V to 5.5 V family specification |
| Bus Interface | I2C/SMBus | I2C/SMBus family interface | I2C/SMBus | I2C/SMBus family interface | I2C/SMBus family interface | I2C/SMBus family interface |
| Mounting Type | Surface mount | Surface mount | Surface mount | Surface mount; verify exact suffix | Surface mount | Surface mount |
关键差异点
- Four-line GPIO expansion in an 8-SOIC package （对比 PCA9536D,118)
- Supplier and lifecycle distinction （对比 PCA9536D,118)
- Direct replacement candidates in supplied cross-reference data （对比 PCA9536DRG4)
设计说明
Place the PCA9536D close to the I2C controller and the devices it controls, then route SCL and SDA as a short, controlled bus pair. Keep pull-up resistors near the bus master or according to the system-level bus strategy. The verified data does not specify pin numbers or exact electrical limits, so confirm the footprint and pin functions against the selected manufacturer's datasheet before release.
Check the pull-up network against the bus voltage, total bus capacitance, sink-current capability, and required rise time. A listed 400 kHz interface does not guarantee clean operation on a long or heavily loaded wiring harness. Use the slowest supported rate and verify timing margins in hardware, especially when the expander is connected through connectors or cables.
Do not treat PCA9536D, PCA9536D,118, PCA9536DR, and similar orderable variants as automatically identical without checking manufacturer, package, pinout, and lifecycle status. The supplied results show both Texas Instruments and NXP offerings, while the NXP page is marked end of life. Record the exact approved MPN and verify procurement source before committing a production BOM.
合规信息
The supplied verified data does not provide explicit RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 status for the exact selected PCA9536D orderable part. AEC-Q100 is marked not_applicable because the supplied material does not identify an automotive-qualified variant; this is not an automotive qualification claim.
