Overview
The PCF2123BS/1,512 is a CMOS Real-Time Clock (RTC) and calendar chip designed by NXP USA Inc., optimized for low power applications. This component is part of the PCF2123 series and is particularly suited for devices that require precise timekeeping with minimal power consumption.
Key Specifications
| Specification | Details |
|---|---|
| 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 |
| Data Rate | Maximum 6.25 Mbit/s |
| Oscillator Frequency | 32.768 kHz |
| Integrated Load Capacitors | CL = 7 pF |
| Package Type | HVQFN16 plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 3 × 3 × 0.85 mm |
| Interrupt and Clock Output | Open-drain interrupt and clock output pins |
| Power-On Reset | Internal Power-On Reset (POR) |
| Offset Register | Programmable offset register for frequency adjustment |
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 to conserve power in battery-powered devices.
- Freely programmable timer and alarm with interrupt capability.
- Watchdog functionality for system monitoring.
- Integrated oscillator load capacitors.
- Programmable clock output and 1 second or 1 minute interrupt output.
- Serial interface operating at VDD = 1.8 V to 5.5 V.
Applications
- Time keeping applications.
- Battery powered devices.
- Metering and high duration timers.
- Daily alarms and low standby power applications.
Q & A
- What is the primary function of the PCF2123BS/1,512?
The primary function is to provide a real-time clock and calendar optimized for low power applications. - What is the operating voltage range of the PCF2123BS/1,512?
The operating voltage range is from 1.1 V to 5.5 V. - What type of serial interface does the PCF2123BS/1,512 use?
The PCF2123BS/1,512 uses a 3-line SPI-bus with separate, but combinable data input and output. - What is the maximum data rate of the serial interface?
The maximum data rate is 6.25 Mbit/s. - What is the typical backup current at 2.0 V and 25 °C?
The typical backup current is 100 nA. - Does the PCF2123BS/1,512 have integrated load capacitors?
Yes, it has integrated load capacitors for CL = 7 pF. - What is the purpose of the programmable offset register?
The programmable offset register allows for fine tuning of the clock frequency. - What types of alarms can be set on the PCF2123BS/1,512?
The device supports freely programmable timer and alarm functions with interrupt capability, including minute, hour, day, and weekday alarms. - Is there a watchdog functionality in the PCF2123BS/1,512?
Yes, the device includes watchdog functionality for system monitoring. - What are some common applications of the PCF2123BS/1,512?
Common applications include time keeping, battery-powered devices, metering, high duration timers, and daily alarms.
