Overview
The RTC-72423A, produced by EPSON, is a 4-bit real-time clock (RTC) module designed for efficient and accurate timekeeping. This module features a built-in crystal unit, which allows for adjustment-free operation, and supports both 24-hour and 12-hour formats with automatic leap year adjustment based on the Gregorian calendar.
The RTC-72423A is part of the RTC-7242 series, which does not have complete compatibility with the older RTC-6242 series. Therefore, users replacing the older series with the new one should refer to the latest manual for technical details.
Key Specifications
| Item | Symbol | Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage | VDD | Ta=+25 °C | -0.3 | 7.0 | V | |
| Current Consumption | IDD1 | VDD=5 V, CS1=0 V | 1 | 10 | µA | |
| Input Voltage | VI/O | Ta=+25 °C | GND-0.3 | VDD+0.3 | V | |
| Storage Temperature | TSTG | -55 | 125 | °C | ||
| HIGH Input Voltage (1) | VIH1 | 2.2 | V | |||
| LOW Input Voltage (1) | VIL1 | 0.8 | V | |||
| LOW Output Voltage (1) | VOL1 | IOL=2.5 mA | 0.4 | V | ||
| Operating Temperature | TOPR | -40 | 85 | °C | ||
| Frequency Precision | ∆f / f | Ta=+25 °C, VDD=5.0 V | ±20 ×10^-6 (72423A) | ±50 ×10^-6 (72423B) |
Key Features
- Built-in Crystal Unit: Allows for adjustment-free efficient operation.
- Time Format Flexibility: Supports both 24-hour and 12-hour formats with automatic leap year adjustment based on the Gregorian calendar.
- Low Power Consumption: Current consumption as low as 1 µA at VDD=5 V.
- Wide Operating Temperature Range: Operates from -40 °C to +85 °C.
- Multiple Registers: Includes various registers for time, date, and control functions.
- Backup Mode: High impedance mode during backup operation to conserve power.
Applications
- Embedded Systems: Suitable for use in various embedded systems requiring accurate timekeeping.
- Industrial Automation: Used in industrial automation devices that need precise timing and scheduling.
- Consumer Electronics: Found in consumer electronics such as clocks, timers, and other time-dependent devices.
- Medical Devices: Used in medical devices that require accurate timekeeping for logging and scheduling purposes.
- Automotive Systems: Used in automotive systems for timing and scheduling functions.
Q & A
- Q: What is the operating temperature range of the RTC-72423A?
A: The operating temperature range is from -40 °C to +85 °C. - Q: Does the RTC-72423A support both 24-hour and 12-hour formats?
A: Yes, it supports both 24-hour and 12-hour formats with automatic leap year adjustment. - Q: What is the typical current consumption of the RTC-72423A at VDD=5 V?
A: The typical current consumption is 1 µA. - Q: Is the RTC-72423A compatible with the older RTC-6242 series?
A: No, the RTC-7242 series does not have complete compatibility with the older RTC-6242 series. - Q: What is the frequency precision of the RTC-72423A at Ta=+25 °C and VDD=5.0 V?
A: The frequency precision is ±20 ×10^-6 for the 72423A model and ±50 ×10^-6 for the 72423B model. - Q: How does the RTC-72423A handle backup operation?
A: It enters a high impedance mode during backup operation to conserve power. - Q: What is the storage temperature range for the RTC-72423A?
A: The storage temperature range is from -55 °C to +125 °C. - Q: Can the RTC-72423A be used in industrial automation devices?
A: Yes, it is suitable for use in industrial automation devices that need precise timing and scheduling. - Q: Are there any specific initialization procedures for the RTC-72423A after power-on?
A: Yes, users should write to all registers after power-on to set initial values. Refer to the application manual for details. - Q: What is the significance of the TEST bit in control register F?
A: The TEST bit is used by EPSON for testing and should be set to 0 during power-on initialization to ensure guaranteed operation.
