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GPIO Expander

GPIO Expander

很难从一开始就预见到项目的需求。在一个项目开始时，选择一个具有精确正确IO量的MCU可能是不够的，因为在开发过程中，需求逐渐增加，并且出现了不可预见的工程挑战。将差异化添加到您的项目中同样具有挑战性，因为大多数可用的MCU对每个人都可用。那么，当您已经使用了所有可用的IO时，如何轻松地添加新功能呢？如何扩大IO的数量？新的I2C模块GreenPAK™ 5是一个理想的GPIO扩展器，允许您在已经高度集成的设计中添加新功能、逻辑、时序和传感。

格林帕克™ GPIO扩展器的优点：

  • 系统稳定性
    • GreenPAK is 100% hardware - Implementing features in hardware ensures stability
    • GreenPAK可以集成许多组件，确保更少的故障点
  • 耗电量
    • GreenPAK是低功耗的
  • Configurable Pinout
    • GreenPAK GPIO routing is flexible – Ensuring the least complexity in PCB routing
  • Size
    • GreenPAK is as small as 1.2 mm² - In mobile and wearable electronics, every mm counts
  • Configurable GPIO
    • GreenPAK signal routing is flexible – PCB layout and routing
    • GreenPAK I/O are configurable – Pull-up/down resistors, Push-Pull, Open drain, etc.
    • GreenPAK逻辑可配置–低/高激活

Expanding GPIO

Using GreenPAK’s I2C block allows for easy expansion of both input and output. With simple I2C commands the matrix input of each component on the chip, including the GPIO, can be read, expanding input. With simple I2C write commands, I2C virtual inputs can push digital signals into the device or directly to GPIO.

I2C虚拟输入

Key Design Considerations

  • IO Configuration – Configurable pull-up / pull-down resistors on GreenPAK’s GPIO make communicating with any IC a snap.
  • Initial values – Using GreenPAKs OTP NVM, it is easy to set initial output values
  • Latching during Write – GreenPAK can be set to latch IO during write or update values as soon as a bit is written
  • I2C Speed – GreenPAK I2C is 400 kHz
  • I2C地址–GreenPAK I2C最多可以有16个唯一地址
  • 时机Adjustment and Additional Glue Logic – GreenPAK has integrated LUTs, Inverters, DFFs, Counters

I2C Readable Matrix Inputs

Resource Utilization

GreenPAK通常可以在一个小设备中实现多个功能。这并不局限于GPIO扩展应用程序。只需一个GreenPAK设备就可以根据设计要求和资源配置实现粘合逻辑、定时调整、复位、电源排序、LED控制等。亚博国际官网平台网址

All of GreenPAK 5 devices contain the needed I2C block for GPIO expansion and are only limited by the number of pins. Below is a chart of the maximum number of direct inputs or outputs achievable for each member of the family.

GreenPAK 产量扩张 Input Expansion
SLG46531V型 8 16
SLG46532V电源 8 15
SLG46533V型 8 16

GreenPAK开发工具and Software

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