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CY8C9520A, CY8C9540A, CY8C9560A: 20-, 40-, and 60-Bit I/O Expander with EEPROM | サイプレス セミコンダクタ

CY8C9520A, CY8C9540A, CY8C9560A: 20-, 40-, and 60-Bit I/O Expander with EEPROM

The CY8C95xxA is a multi-port I/O expander with on board user available EEPROM and several PWM outputs.

20-, 40-, and 60-Bit I/O Expander with EEPROM


  • I2C interface logic electrically compatible with SMBus
  • Up to 20 (CY8C9520A), 40 (CY8C9540A), or 60 (CY8C9560A) I/O data pins independently configurable as inputs, outputs, Bi-directional input/outputs, or PWM outputs
  • 4/8/16 PWM sources with 8-bit resolution
  • Extendable soft addressing algorithm allowing flexible I2C address configuration
  • Internal 3-/11-/27-Kbyte EEPROM
  • User default storage, I/O port settings in internal EEPROM
  • Optional EEPROM write disable (WD) input
  • Interrupt output indicates input pin level changes and pulse width modulator (PWM) state changes
  • Internal power on reset (POR)
  • Internal configurable watchdog timer


The CY8C95xxA operates as two I2C slave devices. The first device is a multi port I/O expander (single I2C address to access all ports through registers). The second device is a serial EEPROM. Dedicated configuration registers can be used to disable the EEPROM. The EEPROM uses 2-byte addressing to support the 28 Kbyte EEPROM address space. The selected device is defined by the most significant bits of the I2C address or by specific register addressing.

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