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PCF8566T

Name: PCF8566T
Rating: 4.7 (12 reviews)

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規格

Part Status	Active
Base Product Number	PCF85
Packaging	Tape & Reel (TR)

概述

Description

PCF8566T is an I2C-based real-time clock/calendar IC from NXP (Philips) used to keep accurate time in microcontroller systems, even when main power is off.
Key points:
- Timekeeping: seconds, minutes, hours, day, date, month, year with 12/24-hour modes and leap-year handling.
- Features: alarms, timers, programmable square-wave output.
- Memory: includes on-chip RAM for data storage.
- Power: supports battery-backed operation via VBAT and wide supply range (roughly 2.0–5.5 V) with low power consumption.
- Interface: controlled over I2C; device address set by address pins.
- Typical uses: data logging, clocks, alarms, scheduling in embedded systems.
For exact pinout, RAM size, timing, and electrical characteristics, refer to the PCF8566T datasheet.

Features

Key features of PCF8566T (RTC/Calendar IC):
- I2C-bus real-time clock and calendar
- Timekeeping registers: seconds, minutes, hours, day, date, month, year; supports 12/24-hour mode
- 32.768 kHz clock/oscillator input for accurate timekeeping
- Alarm functionality with interrupt output; typically multiple alarm/timer options
- Programmable square-wave output with selectable frequencies
- Interrupt/pin outputs for alarm and timer events
- Battery-backup / power-failure retention for continuous operation
- Low-power operation and wide supply voltage range
- Optional trickle-charge circuit for backup power source
- Compact package options suitable for embedded systems
Note: exact alarm/timer options and RAM details vary by revision; consult the specific datasheet for application notes and register map.

Package

PCF8566T is offered in an 8-pin plastic package, typically SOIC-8 (SOP-8).

Pinout

Pin count: 28 pins. Function: I2C real-time clock/calendar (RTC) IC with RAM and programmable outputs for timekeeping and event/flag signaling.

Manufacturer

PCF8566T is manufactured by NXP Semiconductors (formerly Philips Semiconductors). NXP is a Dutch multinational semiconductor company that designs and manufactures integrated circuits and system solutions for automotive, industrial, and consumer electronics.

Application

PCF8566T is an I2C real-time clock/calendar with alarm and timer functions. It is suited for timekeeping in battery-powered embedded systems and for scheduling, event stamping, and wake-up from low power. Typical applications include consumer electronics (clocks, appliances, handhelds), data loggers, automotive instrumentation, industrial controllers, medical devices, smart meters, telecom equipment, and wearables.

Equivalent

Common equivalents to PCF8566T (I2C RTC with RAM) include:
- NXP PCF8563
- Maxim DS3231
- Maxim DS1307
- Microchip MCP7940N / MCP79410
- Intersil Renesas ISL1208 / ISL1209
Note: compatibility depends on register maps and RAM size; verify interface and timing before substituting.