Thông số kỹ thuật
| thuộc tính | Giá trị |
| Package / Case | Tube |
| Part Status | Active |
| Type | Clock/Calendar |
| Features | Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger |
| Memory Size | 114B |
| Time Format | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Interface | Parallel |
| Voltage - Supply | 2.97V ~ 3.63V |
| Voltage - Supply, Battery | 2V ~ 3.05V |
| Current - Timekeeping(Max) | 2mA @ 2.97V ~ 3.63V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Through Hole |
Tổng quan
Description
The DS12CR887-33+ is a real-time clock (RTC) chip by Maxim Integrated (now part of Analog Devices). It provides timekeeping functions with a built-in quartz oscillator, eliminating the need for external components. Key features include:
- Integrated Crystal & Battery Backup: Ensures continuous timekeeping during power loss.
- Binary-Coded Decimal (BCD) Format: Simplifies time/date handling.
- 12/24-Hour Mode: Supports both time formats.
- Alarm & Periodic Interrupts: Useful for scheduling tasks.
- 3.3V Operation: Low-power CMOS design.
- Industrial Temperature Range: Reliable in harsh environments.
Commonly used in embedded systems, servers, and industrial applications, the DS12CR887-33+ offers a compact, self-contained RTC solution. Its drop-in compatibility with older DS1287/DS12C887 models makes it a versatile upgrade.
- Integrated Crystal & Battery Backup: Ensures continuous timekeeping during power loss.
- Binary-Coded Decimal (BCD) Format: Simplifies time/date handling.
- 12/24-Hour Mode: Supports both time formats.
- Alarm & Periodic Interrupts: Useful for scheduling tasks.
- 3.3V Operation: Low-power CMOS design.
- Industrial Temperature Range: Reliable in harsh environments.
Commonly used in embedded systems, servers, and industrial applications, the DS12CR887-33+ offers a compact, self-contained RTC solution. Its drop-in compatibility with older DS1287/DS12C887 models makes it a versatile upgrade.
Pinout
The DS12CR887-33+ is a real-time clock (RTC) chip with 24 pins. Key functions include:
- Timekeeping: Tracks seconds, minutes, hours, day, date, month, and year (with leap-year compensation).
- Battery Backup: Operates from an external battery when main power fails.
- Clock Output: Provides a square-wave output (programmable frequencies).
- Interrupts: Supports periodic, alarm, and update-ended interrupts.
- Interface: Parallel (8-bit) bus for communication with microcontrollers.
- Voltage Range: 4.5V to 5.5V (3.3V-compatible outputs).
Pins include power (VCC, GND), data bus (D0-D7), address (AS, DS, R/W), chip select (CS), and interrupt (IRQ).
- Timekeeping: Tracks seconds, minutes, hours, day, date, month, and year (with leap-year compensation).
- Battery Backup: Operates from an external battery when main power fails.
- Clock Output: Provides a square-wave output (programmable frequencies).
- Interrupts: Supports periodic, alarm, and update-ended interrupts.
- Interface: Parallel (8-bit) bus for communication with microcontrollers.
- Voltage Range: 4.5V to 5.5V (3.3V-compatible outputs).
Pins include power (VCC, GND), data bus (D0-D7), address (AS, DS, R/W), chip select (CS), and interrupt (IRQ).
Application
The DS12CR887-33+ is a real-time clock (RTC) chip with an integrated quartz crystal, commonly used in applications requiring accurate timekeeping. Key application areas include:
- Embedded Systems: Timestamping, scheduling, and event logging.
- Industrial Automation: Process control and equipment monitoring.
- Consumer Electronics: Appliances, smart meters, and digital signage.
- Medical Devices: Time-sensitive data recording.
- Automotive Systems: Dashboard clocks and diagnostics.
- Networking Equipment: Logging and synchronization tasks.
Its battery-backed operation ensures time retention during power loss, making it ideal for critical timing needs.
- Embedded Systems: Timestamping, scheduling, and event logging.
- Industrial Automation: Process control and equipment monitoring.
- Consumer Electronics: Appliances, smart meters, and digital signage.
- Medical Devices: Time-sensitive data recording.
- Automotive Systems: Dashboard clocks and diagnostics.
- Networking Equipment: Logging and synchronization tasks.
Its battery-backed operation ensures time retention during power loss, making it ideal for critical timing needs.
Package
The DS12CR887-33+ is a real-time clock (RTC) module packaged in a 24-pin DIP (Dual In-line Package). It features a built-in quartz crystal and lithium battery for timekeeping. The package type is 600-mil DIP, making it suitable for through-hole PCB mounting. Its dimensions are approximately 32.13mm x 13.97mm.
