Save your valuable space on the board by using 2-pin EEPROM device from Microchip.
Technology has been growing on a bigger scale and it is making life easier for the designer as well as the end user. The norm of present day electronics designs is as dense as possible and we are moving towards miniature electronics designs. One that belongs to this category is the 2-pin serial EEPROM device from AT21CS11.
Many of us used I2C based and PSI based EEPROMS. These devices use lot of microcontroller pins and also occupies significant space in the PCB Layout. If you have very less space and you have problem with microcontroller/processor pin count, then AT21CS11 could be an option for you.
AT21CS11 from Microchip is a just a 2-pin EEPORM device. One pin is used for ground and the second pin is used to supply the EEPROM as well as communicate with it. The chip follows the I2C protocol structure for communication. As we all know that I2C is open drain and requires a pull-up, so, here a single pull-up on communication line is enough instead of two used with normal I2C interface. The same pull-up also powers the EEPROM. The same I2C connectivity of ORing applies here also as it is open drain and multiple devices can be connected. As single wire is used, you can definitely see a lower speed of operation and the maximum speed that can be achieved in this family of EEPROMS from Microchip is 125kbps (High Speed Mode). The memory size is 1-Kbit and available in SOT23, SOIC and WLCSP packages.
Right now AT21CS11 is available for commercial and industrial ranges which means the operating temperature is in the range -40 to +85degC. The device is internally ESD protected and is IEC 61000-4-2 Level 4 ESD Compliant. The ESD levels tolerable are ±8 kV Contact Discharge (HBM), ±15 kV Air Discharge. The device shall have 3-bit address pre-programmed onto the device. The address is read-only and cannot be modified.
However, one has to agree that the firmware turns to be little more complex.
Access the datasheet from here:
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