Overview
The PCF2123TS/1,112, produced by NXP USA Inc., is a CMOS Real-Time Clock (RTC) and calendar designed for low power applications. This device is optimized for serial data transfer via a Serial Peripheral Interface (SPI-bus) with a maximum data rate of 6.25 Mbit/s. It is particularly suited for applications requiring precise timekeeping and low power consumption.
Key Specifications
| Parameter | Description |
|---|---|
| Operating Voltage | 1.1 V to 5.5 V |
| Backup Current | Typical 100 nA at VDD = 2.0 V and Tamb = 25 °C |
| Serial Interface | 3-line SPI-bus with separate, but combinable data input and output |
| Serial Interface Voltage | VDD = 1.8 V to 5.5 V |
| Oscillator Frequency | 32.768 kHz |
| Integrated Load Capacitors | For CL = 7 pF |
| Interrupt Output | 1 second or 1 minute interrupt output |
| Watchdog Functionality | Available |
| Timer and Alarm | Freely programmable with interrupt capability |
| Package Type | HVQFN16, among others |
Key Features
- Real-time clock providing year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz quartz crystal
- Low backup current for power efficiency
- Resolution from seconds to years
- Watchdog functionality for system monitoring
- Freely programmable timer and alarm with interrupt capability
- Programmable offset register for frequency adjustment
- Internal Power-On Reset (POR)
- Open-drain interrupt and clock output pins
Applications
- Time keeping applications
- Battery powered devices
- Metering applications
- High duration timers
- Daily alarms
- Low standby power applications
Q & A
- What is the PCF2123TS/1,112 used for? The PCF2123TS/1,112 is used as a Real-Time Clock (RTC) and calendar in various applications requiring precise timekeeping and low power consumption.
- What is the operating voltage range of the PCF2123TS/1,112? The operating voltage range is from 1.1 V to 5.5 V.
- How does the PCF2123TS/1,112 communicate with other devices? It communicates via a Serial Peripheral Interface (SPI-bus) with a maximum data rate of 6.25 Mbit/s.
- What is the typical backup current of the PCF2123TS/1,112? The typical backup current is 100 nA at VDD = 2.0 V and Tamb = 25 °C.
- Does the PCF2123TS/1,112 have watchdog functionality? Yes, it includes watchdog functionality.
- Can the timer and alarm be programmed on the PCF2123TS/1,112? Yes, the timer and alarm are freely programmable with interrupt capability.
- What type of oscillator does the PCF2123TS/1,112 use? It uses a 32.768 kHz quartz crystal oscillator.
- Are there integrated load capacitors in the PCF2123TS/1,112? Yes, it has integrated load capacitors for CL = 7 pF.
- What types of interrupt outputs are available on the PCF2123TS/1,112? It provides 1 second or 1 minute interrupt output.
- Is there an internal Power-On Reset (POR) in the PCF2123TS/1,112? Yes, it includes an internal Power-On Reset (POR).
