|
|
|
DS28DG02
2Kb SPI EEPROM with PIO, RTC, Reset, Battery Monitor, and Watchdog
Integrates Key Mixed-Signal and EEPROM-Array Functions Typically Required in a Wide Variety of Systems
|
Status
All versions are No Longer Available.
Description
The DS28DG02 combines 2Kb (256 x 8) EEPROM with 12 PIO lines, a real-time clock (RTC) and calendar with alarm function, a CPU reset monitor, a battery monitor, and a watchdog. Communication with the device is accomplished with an industry-standard SPI™ interface. The user EEPROM is organized as four blocks of 64 bytes each with single-byte and up to 16-byte page write capability. Additional registers provide access to PIOs and to setup functions. Individual PIO lines can be configured as inputs or outputs. The power-on state of PIOs programmed as outputs is stored in nonvolatile (NV) memory. All PIOs may be
reconfigured by the user through the serial interface. The RTC/calendar operates in the 12/24-hour format and automatically corrects for leap years. Battery monitor threshold and watchdog timeout are user-programmable through NV registers. The reset monitor generates a reset to the CPU if the voltage at the VCC pin falls below the factory-set limit. The reset output includes a debounce circuit for manual pushbutton reset.
|
|
Data Sheet
|
Key Features
- 2Kb (256 x 8) EEPROM Organized in Four 64-Byte Blocks
- Single Byte and Up to 16-Byte EEPROM Write Sequences
- EEPROM Write-Protect Control Pin Protects 1, 2, or All 4 Blocks
- Endurance 200k Cycles per Page at +25°C; 10ms (max) EEPROM Write Cycle
- SPI Serial Interface Supporting Modes (0,0) and (1,1) at Up to 2MHz Clock Frequency
- 12 PIO Lines with LED Drive Capability
- Each PIO is Configured to Input or Output, Open-Drain/Push-Pull on Startup by Stored Value
- All PIOs are Reconfigurable After Startup
- RTC/Calendar/Alarm with BCD Format and Leap-Year Compensation
- RTC Controlled Through 32.768kHz, 12.5pF Crystal or External TCXO
- CPU Reset Through Fast-Response Precision VCC Monitor with Hysteresis or Pushbutton
- Battery Monitor 2.5V, 2.25V, 2.0V, 1.75V, -5%
- Watchdog Timer 1.6s, 0.8s, 0.4s, 0.2s (typ)
- Unique Factory-Programmed 64-Bit Device Registration Number
- Operating Range: 2.2V to 5.25V, -40°C to +85°C
- ±4kV IEC 1000-4-2 ESD Protection Level (Except Crystal Pins)
- Available in 28-Lead, 4.4mm TSSOP or 36-Lead 6mm × 6mm QFN Package
|
|
Applications/Uses
- Asset-Tracking Systems
- Broadband Access Network Equipment
- Holter Heart Monitors
- Home Lighting Control Systems
- Patient-Monitoring Systems
- RAID Systems
- Servers
- Wireless Base Stations
|
|
|
|
Diagram
DS28DG02 Block Diagram
Typical Operating Circuit: Microcontroller External NV-Memory and Port Expander
More Information
Didn't Find What You Need?
Information Index
Rev 2;
2009-12-01
This page last modified: 2009-12-01
|
|
|
Download
E-Mail