CY8C9560 Datasheet | Cypress

.. Cypress Semiconductor CY8C9520, CY8C9540, and CY8C9560 Preliminary Data Sheet 20-, 40-, and 60-Bit I/O Expander with EEPROM Features - - Overview The CY8C95xx is a multi-port I/O expander with on-board useravailable EEPROM and several PWM outputs. All devices in this family operate identically but differ in I/O pins, number of PWMs, and internal EEPROM size. The CY8C95xx operates as two I2C slave devices. The first device is a multi-port I/O expander (single I2C address to access all ports via registers). The second device is a serial EEPROM. Dedicated configuration registers can be used to disable the EEPROM. The EEPROM utilizes 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. The I/O expander's data pins can be independently assigned as inputs, outputs, quasi-bidirectional input/outputs or PWM ouputs. The individual data pins can be configured as open drain/collector, strong drive (10 m A source, 25 m A sink), resistively pulled-up/-down, or high-impedance. The factory default configuration is pulled-up internally. The system master writes to the I/O configuration registers via the I2C bus. Configuration and output register settings can be stored as user defaults in a dedicated section of the EEPROM. If user defaults have been stored in EEPROM, they are restored to the ports at power-up. While this device can share the bus with SMBus devices, it can only municate with I2C-masters. There is one dedicated pin that is configured as an interrupt output (INT) and can be connected to the interrupt logic of the system master. This signal can inform the system master that there is ining data on its ports or that the PWM output state was changed. The EEPROM is byte-readable and supports byte-by-byte writing. A pin can be configured as an EEPROM Write Disable (WD) input that blocks write operations when set high. The...