Overview
The DS1302Z+T&R from Analog Devices Inc./Maxim Integrated is a versatile real-time clock (RTC) module designed to provide a comprehensive timekeeping solution for various applications. This compact integrated circuit is capable of tracking seconds, minutes, hours, days, dates, months, and years with exceptional accuracy. The DS1302Z+T&R is particularly notable for its trickle-charge capability, which allows the RTC to maintain its timekeeping functions even when the primary power supply is disconnected by using a small lithium coin cell battery.
The device operates over a wide voltage range of 2V to 5.5V and has low power consumption, making it suitable for battery-powered applications. It interfaces with a microcontroller via a simple serial interface, minimizing the pin count and simplifying the connection.
Key Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Package/Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Memory Size | 31 bytes of battery-backed static RAM |
| Interface | 3-Wire Serial |
| Type | Clock/Calendar |
| Operating Temperature | 0°C ~ 70°C |
| Voltage - Supply | 2V ~ 5.5V |
| Time Format | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Current - Timekeeping (Max) | 0.3µA ~ 1µA @ 2V ~ 5V |
| Leap Year Compensation | Valid up to 2100 |
Key Features
- Trickle-Charge Capability: Allows the RTC to maintain timekeeping functions using a small lithium coin cell battery when the primary power supply is disconnected.
- Low Power Consumption: Operates on less than 1μW, making it suitable for battery-powered applications.
- Serial Interface: Communicates with a microcontroller via a simple 3-wire serial interface (CE, I/O, SCLK).
- Programmable Trickle Charger: Can be set to different charging rates to accommodate various battery sizes and chemistries.
- Battery-Backed Static RAM: 31 bytes of RAM for storing data that needs to be preserved during power loss.
- Time-of-Day Alarms: Two programmable time-of-day alarms.
- Square-Wave Output: Programmable square-wave output for timing, calibration, or as an interrupt source.
- Automated Assembly: Supplied on tape and reel (T&R) for automated assembly processes.
Applications
- Embedded Systems: Ideal for systems requiring continuous time tracking.
- Utility Meters: Suitable for metering applications where accurate timekeeping is essential.
- Electronic Appliances: Used in various electronic devices that require precise timekeeping.
- Clock & Timing: General clock and timing applications in industrial and consumer electronics.
Q & A
- What is the primary function of the DS1302Z+T&R?
The primary function of the DS1302Z+T&R is to provide a real-time clock/calendar with additional features like battery-backed static RAM and a trickle-charge capability.
- What is the voltage range for the DS1302Z+T&R?
The DS1302Z+T&R operates over a voltage range of 2V to 5.5V.
- How does the DS1302Z+T&R maintain timekeeping during power loss?
The DS1302Z+T&R maintains timekeeping during power loss through its trickle-charge capability using a small lithium coin cell battery.
- What type of interface does the DS1302Z+T&R use to communicate with a microcontroller?
The DS1302Z+T&R communicates with a microcontroller via a simple 3-wire serial interface (CE, I/O, SCLK).
- What is the memory size of the battery-backed static RAM in the DS1302Z+T&R?
The DS1302Z+T&R has 31 bytes of battery-backed static RAM.
- Does the DS1302Z+T&R support leap year compensation?
Yes, the DS1302Z+T&R supports leap year compensation valid up to 2100.
- What is the operating temperature range of the DS1302Z+T&R?
The operating temperature range of the DS1302Z+T&R is from 0°C to 70°C.
- Is the DS1302Z+T&R suitable for automated assembly processes?
Yes, the DS1302Z+T&R is supplied on tape and reel (T&R) for automated assembly processes.
- What are some common applications of the DS1302Z+T&R?
The DS1302Z+T&R is commonly used in embedded systems, utility meters, electronic appliances, and general clock and timing applications.
- What is the estimated end-of-life date for the DS1302Z+T&R?
The estimated end-of-life date for the DS1302Z+T&R is 2026.
