PCF8583T/5,512 Datasheet Summary

Product Overview

The PCF8583T/5,512 is a clock and calendar chip with 240 bytes of 8-bit RAM, designed for applications requiring precise timekeeping and data storage. It features a built-in 32.768 kHz oscillator and operates via a two-line bidirectional I2C-bus. This device is suitable for a wide range of applications, including consumer electronics, office equipment, and industrial systems.

Features

• I2C-bus Interface: Operating supply voltage range of 2.5V to 6V.
• Clock Function: With a four-year calendar and universal timer.
• 240 x 8-bit Low-Voltage RAM: Data retention voltage range of 1.0V to 6.0V.
• Operating Current: Max 50μA at fSCL = 0Hz.
• 24-hour or 12-hour Format: Supports both formats.
• 32.768 kHz or 50Hz Time Base: Flexible time base options.
• Programmable Alarm and Timer: With overflow indication.
• Slave Addresses: A1h or A3h for reading, A0h or A2h for writing.

Ordering Information

• Type Number: PCF8583T
• Package: SO8 (plastic small outline package; 8 leads; body width 7.5 mm)
• Version: SOT176-1

Marking Information

• Marking Code: 8583T

Pin Configuration

TableCopy

Functional Description

The PCF8583T contains a 256-byte by 8-bit RAM with an 8-bit auto-increment address register. The first 16 bytes of the RAM are used for clock, calendar, and counter functions. The remaining 240 bytes are available for general-purpose RAM storage.

Counter Function Modes

• 32.768 kHz Clock Mode: Stores time in BCD format.
• 50 Hz Clock Mode: Suitable for applications requiring a 50 Hz reference.
• Event-Counter Mode: Counts external pulses applied to the oscillator input.

Alarm Function Modes

• Dated Alarm: Triggers on a specific date.
• Daily Alarm: Triggers daily at a set time.
• Weekday Alarm: Triggers on specific weekdays.
• Timer Alarm: Triggers after a set interval.

Control and Status Register

• Memory Location 00h: Controls and monitors the device's status.
• Functions: Timer flag, alarm flag, alarm enable, mask flag, function mode, hold last count, stop counting.

Counter Registers

• Memory Locations 01h to 07h: Store time-related data (seconds, minutes, hours, date, month, year, timer).

Alarm Control Register

• Memory Location 08h: Controls alarm functions and timer settings.

Characteristics

Static Characteristics

• Supply Voltage (VDD): 2.5V to 6.0V (operating mode).
• Supply Current (IDD): Max 50μA (clock mode, fSCL = 0Hz).
• Enable Voltage (Ven): 1.5V to 2.3V (I2C-bus enable level).

Dynamic Characteristics

• SCL Clock Frequency (fSCL): Up to 100 kHz.
• Oscillator Capacitance (COSCO): 40 pF.
• Relative Oscillator Frequency Variation: ±0.2 ppm (for ΔVDD = 100 mV).

Application Information

Quartz Frequency Adjustment

• Fixed OSCI Capacitor: Use a fixed capacitor for stable frequency.
• OSCI Trimmer: Adjust the trimmer for precise frequency control.
• Direct Measurement: Measure the oscillator output directly for calibration.

Package Outline

• SO8 Package: Plastic small outline package with 8 leads and a body width of 7.5 mm.

Soldering Information

• Wave Soldering: Suitable for through-hole and SMD components.
• Reflow Soldering: Ideal for fine-pitch SMDs.