Mixed-signal memory IC saves board space, cuts costs

Sunnyvale, Calif.—Maxim Integrated Products has introduced the DS28DG02, a memory device that integrates mixed-signal and nonvolatile memory functions that results in a 20% savings in PCB space and 30% savings in cost.

The DS28DG02 has a 2kb EEPROM array, which meets the size requirements to store system configuration, calibration and operational settings 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.
The DS28DG02's RTC provides a BCD formatted clock/calendar with a programmable time/calendar alarm. Of particular benefit for portable electronic devices, the RTC can be powered from an external backup power source, such as a lithium coin cell, in the absence of Vcc power.

The DS28DG02 is the first device to provide a user-programmable, supervisory function that actively monitors the health of the backup battery. While operating under Vcc power, the battery monitor periodically tests the backup source and generates an alarm interrupt if the battery condition is out of spec.

The active battery monitor applies a 10 microamp (typ) test load with 1-second duration to the battery each hour. It then follows with a battery terminal voltage comparison to a programmable test point; the comparison range is programmable from 1.75V to 2.5V with 0.25V increments. An interrupt output is generated if the terminal voltage is below the programmed threshold.

Additional DS28DG02 supervisory functions include a voltage monitor and watchdog timer, both with reset outputs. The voltage monitor is factory-programmed to generate a 328ms (typ) reset at 3.3V, -5% with 2.5% accuracy over the operating range. The monitor's reset output can also be used as a pushbutton input/output with debounce. The watchdog is user-programmable with timeout options ranging from 0.2s to 1.64s (typ).

For equipment and applications that require a unique electronic serial number, the DS28DG02 provides a factory-programmed 64-bit ROM ID unique to each device. This 64-bit ID can be used to serialize a piece of equipment for tracking by manufacturing or to generate a unique node ID for networked environments. Serial communication with the DS28DG02 is performed over the industry standard SPI interface at speeds up to 2-MHz.

The DS28DG02 will fit into a broad range of end-equipment applications. Examples include medical instruments, base stations and data communication equipment, servers, vending equipment, asset tracking systems, process control, Point-of-Sale (POS) equipment, building lighting, and energy control.

The standard device operates at 3.3V, ±5%. Other versions are available that operate at 5V, 3V, 2.5V, and some with 5% and 10% trip point options. The DS28DG02 is specified over the -40 °C to +85°C industrial temperature range. Package options include 28-pin TSSOP and 36-pin, 6mm x 6mm TQFN.

Pricing: Starts at $1.81 (1,000-up, FOB USA).
Availability: Now.

Datasheet: click here.

Maxim Integrated Products, 1-408-737-7600,

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