PCA9570GMH - 4-Bit I2C GPO Expander | NXP | XQFN-8
MPN： PCA9570GMH ✓ 啟用中PCA9570GMH 概覽
An I2C output expander is a semiconductor interface device that converts a serial two-wire bus into additional parallel control outputs. In the product hierarchy, the PCA9570GMH belongs to the I/O expander class, within interface ICs and logic ICs. Unlike a general-purpose input/output expander, the PCA9570 is a streamlined GPO device whose four outputs are configured as push-pull drivers. This makes it suitable for controlling loads that require a driven logic level rather than a high-impedance input.
Key features include four general-purpose parallel outputs, 1 MHz I2C-bus operation, and compatibility with both 100 kHz and 400 kHz bus standards. The low-voltage CMOS construction targets processor-based and handheld battery-powered equipment. The small XQFN-8 footprint helps reduce board area when a controller has too few output pins for relays, indicators, logic enables, or other digital loads.
The PCA9570GMH is a streamlined output-only expander, so its register and pin arrangement should be compared carefully with mixed input/output or bidirectional expanders before substitution. Its four push-pull outputs provide defined high and low states, making the device appropriate for simple control signals in consumer electronics, mobile accessories, battery-powered instruments, and compact embedded systems.
In a typical design, the host connects SDA and SCL to the PCA9570GMH, writes the desired output pattern to the device register, and reads back the output states. The bus lines require pull-up resistors in accordance with the I2C specification. Because the package exposes a pad, the PCB layout should maximize copper area under the exposed pad to improve heat spreading.
For power-sensitive designs, the quiescent current and output-driver loading should be checked against the system battery budget. Because every host controller needs a reliable I2C pull-up arrangement, verify the bus capacitance, pull-up resistance, and level-shifting requirements before layout release. Use the pin-connection and register details in the manufacturer datasheet when assigning PCB tracks.
直接替換替代品，適用於 PCA9570GMH — 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。
此產品無可直接替換的替代品。
申請替代品PCA9570GMH 規格
| Device Type | 4-bit I2C general-purpose output expander |
| 輸出數量 | 4 outputs |
| 輸出配置 | Push-pull |
| Maximum I2C-Bus Speed | 1 MHz |
| Fast-Mode Bus Compatibility | 400 kHz |
| Standard-Mode Bus Compatibility | 100 kHz |
| Maximum Supply Voltage | 3.6 V |
| Technology | CMOS |
| 介面 | I2C-bus |
| 封裝 | 8-pin XQFN, 1.6 mm x 1.6 mm |
| Package Feature | Exposed pad |
| 安裝類型 | Surface mount |
| Product Type | Low-voltage GPO expander |
| Target Applications | Low-voltage processor and handheld battery-powered mobile applications |
PCA9570GMH exposed pad 腳位配置指南
PCA9570GMH（exposed pad 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： PCA9570GMH.
請參閱 資料表 以查看完整腳位配置。
典型應用
PCA9570GMH 適用於 6 應用s: Compact Processor Control Interface, Handheld and Battery-Powered Equipment, LED and Indicator Control, Peripheral Enable and Relay Logic, Smart Home and Sensor Node Control, Audio and Communication Equipment Control.
Compact Processor Control Interface
The PCA9570GMH adds four push-pull logic outputs to a processor that has reached its direct output-pin limit. Its I2C interface operates up to 1 MHz, allowing it to share a fast host bus while remaining compatible with 400 kHz and 100 kHz systems. The 1.6 mm by 1.6 mm XQFN-8 footprint preserves board area in space-constrained embedded products. A host writes an output pattern over SDA and SCL, and the PCA9570GMH drives the four connected logic-control loads directly.
推薦
Handheld and Battery-Powered Equipment
The PCA9570GMH suits low-voltage processor-based and handheld systems where each added output should be compact and controlled through an existing serial bus. Its four push-pull outputs can enable indicators, mode switches, or peripheral control logic without consuming four direct host GPIO pins. The small XQFN-8 package also helps limit board area in wearables and mobile accessories. Confirm the operating-voltage range and standby current against the device's battery budget before finalizing the power architecture.
推薦
LED and Indicator Control
The PCA9570GMH can drive four logic-control outputs for status indicators when the selected loads fall within the device's specified drive limits. The 1 MHz I2C interface allows the host to update several output states in a compact sequential transfer, and the push-pull outputs provide defined high and low drive states. For high-current LEDs, connect the PCA9570GMH outputs to suitable transistor or driver stages rather than loading the expander directly.
推薦
Peripheral Enable and Relay Logic
Four independently controlled outputs from the PCA9570GMH can manage enable lines, interlock signals, or logic-gated power stages in a compact control board. Keeping these functions on the I2C bus reduces direct GPIO usage on the host and simplifies firmware organization through a remote output register. For relays, solenoids, or other inductive loads, use the outputs to control driver stages and verify isolation, switching transients, and current limits in the complete circuit.
推薦
Smart Home and Sensor Node Control
The PCA9570GMH is useful in compact IoT controller boards that must generate several fixed logic states for sensor nodes, actuator interfaces, or downstream communications hardware. Its 1 MHz I2C capability supports a fast host controller, while the 100 kHz and 400 kHz compatibility broadens the range of embedded platforms it can serve. The small XQFN footprint and exposed-pad construction make it practical for dense modules, provided the PCB footprint follows the manufacturer package drawing.
推薦
Audio and Communication Equipment Control
The PCA9570GMH can extend control signals into audio or communications hardware where the host processor lacks enough direct pins for mode, mute, reset, or channel-select control. Its push-pull outputs provide deterministic logic levels, and the 1 MHz I2C interface transfers all four states through the shared bus. Keep the routing compact and observe the device's output timing requirements, particularly when the controlled signals must change relative to a clocked audio or data interface.
推薦
推薦產品摘要
工程參考資料，適用於 PCA9570GMH — 比較、設計指引及合規資訊。
選型指南
Do not choose it when the design requires input sensing, bidirectional signals, more than four outputs, or high-current loads. A mixed I/O expander such as the PCA9535 family is more appropriate when the board must read switches or sensors. Treat PCA9509A-family devices as functionally related rather than drop-in substitutes unless the manufacturer pin and footprint data prove compatibility. Because the PCA9570GMH is output-only, validate reset states, firmware register access, output loading, and the exposed-pad layout before releasing the PCB.
與替代品比較
| 參數 | 本產品 |
|---|---|
| Brand | NXP Semiconductors |
| Package | 8-pin XQFN, 1.6 mm x 1.6 mm, exposed pad |
| Device Type | 4-bit I2C general-purpose output expander |
| Number of Outputs | 4 push-pull outputs |
| Input Capability | No general-purpose input ports |
| Maximum I2C-Bus Speed | 1 MHz |
| Fast-Mode Compatibility | 400 kHz |
| Standard-Mode Compatibility | 100 kHz |
| Maximum Supply Voltage | 3.6 V |
| Technology | Low-voltage CMOS |
| Mounting Type | Surface mount |
| Target Market | Low-voltage processor and handheld battery-powered mobile applications |
主要差異化特點
- High-speed 4-bit output-only expansion (對比PCA9509AGM,125)
- Simplified push-pull output function (對比PCA9535EMTTXG)
- Minimal board footprint for dense designs (對比PCA9535EMTTXG)
設計說明
Use the manufacturer land pattern and paste recommendations for the 8-pin XQFN rather than adapting a generic QFN-8 footprint. The distributor listing confirms an exposed pad in this package, so reserve a solderable thermal-pad land and connect it according to the NXP package drawing. Place SDA and SCL pull-up resistors near the bus master, keep the expander close to the routed signals, and provide uninterrupted ground copper beneath the device.
The PCA9570GMH supports I2C operation up to 1 MHz, but the usable bus rate depends on the complete network. Check bus capacitance, pull-up resistance, clock stretching behavior, and the rise time at every connected device rather than assuming 1 MHz will work over long PCB routes. Keep SDA and SCL away from noisy switching nodes and use a continuous ground reference beneath the traces.
Do not substitute the PCA9570GMH for a bidirectional expander without comparing pin direction, reset output states, and the register map. The PCA9570GMH provides four push-pull outputs and cannot read switch or sensor states. Likewise, do not connect high-current relays, LEDs, or motors directly to its outputs; use suitable driver stages and verify absolute maximum and output-current limits in the manufacturer datasheet.
合規資訊
Compliance declarations are not shown in the product information and are therefore recorded as unknown rather than inferred.
