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Low-Current, Real-Time Clock with I2C Interface

World's smallest RTC in WLP

Product Details

The MAX31342 low-current, real-time clock (RTC) is a time-keeping device that provides an extremely low time-keeping current, permitting longer life from a power supply. The MAX31342 supports 6pF high-ESR crystals, which broaden the pool of usable crystals for the devices. This device is accessed through an I2C serial interface. An integrated power-on reset function ensures deterministic default register status upon power-up.

Other features include two time-of-day alarms, interrupt outputs, a programmable square-wave output, and a serial bus timeout mechanism. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in 24-hour mode. The MAX31342 also includes an input for synchronization. When a reference clock (e.g., 32kHz, 50Hz/60Hz Power Line, GPS 1PPS) is present at the CLKIN pin and the enable external clock input bit (ECLK) is set to 1, the MAX31342 RTC is frequency-locked to the external clock and the clock accuracy is determined by the external source.

The device is available in lead(Pb)-free/RoHS-compliant, 8-pin wafer-level package (WLP) 1mm x 2mm package with 0.5mm pitch. The device supports the -40°C to +85°C extended temperature range.

Key Features

  • Increases Battery Life
    • 150nA Timekeeping Current
    • Wide Range of External Crystals with CL = 6pF and ESR up to 100kΩ for Minimal Current Draw
  • Provides Flexible Configurability
    • Programmable Square Wave Output for Clock Monitoring
  • Saves Board Space
    • Integrated Load Capacitors for Crystal Oscillator
    • 1mm x 2mm, 8-Bump WLP with 0.5mm Pitch
  • Value Add Features for Ease of Use
    • +1.6V to +3.6V Operating Voltage Range
    • Countdown Timer with Repeat Function
  • Integrated Protection
    • Power-On Reset for Default Configuration
    • Lockup-Free Operation with Bus Timeout

Applications/Uses

  • Medical
  • Point-of-Sale (POS)
  • Portable Audio
  • Portable Instruments
  • Power Meters
  • Telematics
  • Wearables
Parametric specs for All Real-Time Clocks
Interface I2C
VSUPPLY (V) 3
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
YY-MM-DD/ HH:MM:SS:hh
YYYY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 150
CL (pF) 6
Time of Day Alarms 2
Package/Pins WLP/8
Budgetary
Price (See Notes)
$0.45 @1k
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Simplified Block Diagram

MAX31342: Functional Diagram MAX31342: Functional Diagram Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX31342 shield is a fully assembled and tested PCB to evaluate the MAX31342, low-current, real-time clock (RTC) with I2C interface. The shield operates from a single supply, either from USB or external power supply, and the onboard crystal provides a 32.768kHz clock signal. This device is accessed through an I2C serial interface.

The MAX31342 shield provides the hardware and software graphical user interface (GUI) necessary to evaluate the MAX31342. The shield includes a MAX31342EWA+T installed. The shield connects to the PC through a MAX32625PICO Board and a micro-USB cable.

View Details

Features

  • Easy Evaluation of the MAX31342
  • +1.6V to 3.6V Single-Supply Operation
  • Proven PCB Layout
  • Mbed/Arduino Platform Compatible
  • Fully Assembled and Tested

/en/design/design-tools/ee-sim.html?

Support & Training

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Filtered Search

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Parameters

Parametric specs for All Real-Time Clocks
Interface I2C
VSUPPLY (V) 3
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
YY-MM-DD/ HH:MM:SS:hh
YYYY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 150
CL (pF) 6
Time of Day Alarms 2
Package/Pins WLP/8
Budgetary
Price (See Notes)
$0.45 @1k

Key Features

  • Increases Battery Life
    • 150nA Timekeeping Current
    • Wide Range of External Crystals with CL = 6pF and ESR up to 100kΩ for Minimal Current Draw
  • Provides Flexible Configurability
    • Programmable Square Wave Output for Clock Monitoring
  • Saves Board Space
    • Integrated Load Capacitors for Crystal Oscillator
    • 1mm x 2mm, 8-Bump WLP with 0.5mm Pitch
  • Value Add Features for Ease of Use
    • +1.6V to +3.6V Operating Voltage Range
    • Countdown Timer with Repeat Function
  • Integrated Protection
    • Power-On Reset for Default Configuration
    • Lockup-Free Operation with Bus Timeout

Applications/Uses

  • Medical
  • Point-of-Sale (POS)
  • Portable Audio
  • Portable Instruments
  • Power Meters
  • Telematics
  • Wearables

Description

The MAX31342 low-current, real-time clock (RTC) is a time-keeping device that provides an extremely low time-keeping current, permitting longer life from a power supply. The MAX31342 supports 6pF high-ESR crystals, which broaden the pool of usable crystals for the devices. This device is accessed through an I2C serial interface. An integrated power-on reset function ensures deterministic default register status upon power-up.

Other features include two time-of-day alarms, interrupt outputs, a programmable square-wave output, and a serial bus timeout mechanism. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in 24-hour mode. The MAX31342 also includes an input for synchronization. When a reference clock (e.g., 32kHz, 50Hz/60Hz Power Line, GPS 1PPS) is present at the CLKIN pin and the enable external clock input bit (ECLK) is set to 1, the MAX31342 RTC is frequency-locked to the external clock and the clock accuracy is determined by the external source.

The device is available in lead(Pb)-free/RoHS-compliant, 8-pin wafer-level package (WLP) 1mm x 2mm package with 0.5mm pitch. The device supports the -40°C to +85°C extended temperature range.

Simplified Block Diagram

MAX31342: Functional Diagram MAX31342: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.