Single chip combines EEPROM, RTC, GPIO, and CPU Supervisor/Monitor trims board space and cuts cost

Dallas Semiconductor has introduced the DS28DG02, a new memory device with unprecedented integration of mixed-signal and nonvolatile memory functions.

Through high integration of functions and capabilities, the DS28DG02 provides typically a 20% savings in PCB space and 30% savings in cost.

Manufacturers of end-equipment will have a reduced bill-of-materials for lower production costs and increased equipment reliability through fewer components. The product designer will realize a reduced design cycle from simplified hardware complexity and a single device for software interaction. With its unmatched array of capabilities, this new memory device is applicable for a broad range of applications in communication, medical, consumer, and industrial end equipment.

"Prior to the availability of the DS28DG02, equipment designers typically used up to four discrete ICs to implement equivalent functionality," noted Scott Jones, Business Director for the Company's mixed-signal memory products. These four discrete devices included an EEPROM, real-time clock (RTC), port expander, and CPU supervisor/monitor. If a designer integrated ROM ID and an active backup battery monitor, yet more discrete components were normally required.
The hardware design of such a discrete implementation was further complicated by factors including multidevice bus interfacing, power-supply bypass filtering, and increased PCB layout effort. The software design effort for
that discrete approach was similarly complicated through configuration and control of multiple devices.

Compared to the complexities of the traditional discrete solution, the integrated approach of the DS28DG02 with its memory array and single set of control/status registers is immediately appealing.

The DS28DG02's integration is a matrix of capabilities not found in any other single device. The circuit has a 2kb EEPROM array which meets the size requirements to store system configuration, calibration, operational settings, etc., required by most applications. In addition, page boundary-programmable write-protection modes are provided to safeguard stored data.

Twelve bidirectional, user-programmable GPIO channels offer a high level of flexibility and convenience for adapting to a wide range of applications. The GPIOs can be configured as input or output, open drain or push-pull, and can be programmed through the EEPROM registers to power up in a defined state. Additionally, the GPIOs can sink up to 22mA when operating at 3.3V, which makes them ideal for LED on/off direct control.

Dallas Semiconductor