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User Module Datasheet: I2C Master Datasheet I2Cm V 2.00 (CY8C29/27/24/22/21xxx, CY7C603xx, CY7C64215, CYWUSB6953, CY8C23x33, CY8CLED0xD, CY8CLED0xG, CY8CLED02/04/08/16, CY8CTST110, CY8CTMG110, CY8CTST120, CY8CTMG120, CY8CTMA120, CY8C21x45, CY8C22x45,... | Cypress Semiconductor

User Module Datasheet: I2C Master Datasheet I2Cm V 2.00 (CY8C29/27/24/22/21xxx, CY7C603xx, CY7C64215, CYWUSB6953, CY8C23x33, CY8CLED0xD, CY8CLED0xG, CY8CLED02/04/08/16, CY8CTST110, CY8CTMG110, CY8CTST120, CY8CTMG120, CY8CTMA120, CY8C21x45, CY8C22x45,...

Last Updated: 
Mar 25, 2015
Version: 
2.00

Features and Overview

  • Industry standard Philips I2C bus compatible interface
  • Only two pins (SDA and SCL) required to interface several slave I2C devices
  • Standard mode data supports rate of 100 kbps
  • High level API requires minimal user programming
  • Low level API provided for flexibility


The I2Cm User Module implements a master I2C device in firmware. The I2C bus is an industry standard,  two-wire interface developed by Philips®. An I2C bus master may communicate with several slave devices  using only two wires. The master initiates all communication on the I2C bus and supplies the clock for all slave devices. The I2Cm User Module supports speeds up to 100 kbps. No digital or analog user blocks  are consumed with this module. 

The Application Programming Interface (API) firmware provides high-level commands that support sending and receiving multiple bytes with a single function call. Repeat starts are supported, but multimaster arbitration and 10-bit addressing are not.

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