MAX31341B

Low-Current, Real-Time Clock with I2C Interface and Power Management

Industry's Smallest RTC with Very Low Time Keeping Current


Please check latest availability status for a specific part variant.

Description

The MAX31341B low-current, real-time clock (RTC) is a time-keeping device that provides nanoamperes timekeeping current, extending battery life. The MAX31341B supports 6pF high-ESR crystals, which broaden the pool of usable crystals for the devices. This device is accessed through an I2C serial interface. The device features one digital Schmitt trigger input and one programmable threshold analog input. The device generates an interrupt output on a falling or rising edge of the digital input (D1), or when the analog input (AIN) voltage crosses a programmed threshold in either direction. 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, a serial bus timeout mechanism, and a 64-byte RAM for user data storage. 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 format. The MAX31341B 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 MAX31341B 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, 12-pin, 2mm x 1.5mm WLP with 0.5mm pitch. The device supports the -40°C to +85°C extended temperature range.

Design Solution: Give Your Wearable’s Micro Some Quality Sleep Time ›

Key Features

  • Increases Battery Life
    • 180nA Timekeeping Current
    • Wide Range of External Crystals with CL = 6pF and ESR up to 100kΩ for Minimal Current Draw
    • Trickle Charger for External Super Capacitor or Rechargeable Battery
  • Provides Flexible Configurability
    • A Schmitt Trigger Input to Trigger Interrupt
    • One Analog Input with Adjustable Threshold to Trigger Interrupt
    • Programmable Square Wave Output for Clock Monitoring
  • Saves Board Space
    • Integrated Load Capacitors for Crystal Oscillator
    • 2mm x 1.5mm, 12-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 and Pause Functions
    • 64-Byte RAM for User Data Storage
  • Integrated Protection
    • Power-On Reset for Default Configuration
    • Automatic Switchover to Backup Battery or Super Capacitor On Power Fail
    • Lockup-Free Operation with Bus Timeout

Applications/Uses

  • Medical
  • Point-of-Sale (POS)
  • Portable Audio
  • Portable Instruments
  • Telematics
  • Wearables
Part NumberInterfaceVSUPPLY
(V)
Time Keeping Current
(nA)
CL
(pF)
Memory TypeMemory Size
(Bytes)
Time of Day AlarmsFunctionsPackage/PinsBudgetary
Price
typSee Notes
MAX31341B I2C
1.8
3
3.3
2306NV SRAM642RTC
WLP/12
$0.70 @1k
See All Timekeeping & Real-Time Clocks (77)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX31341EVKIT: Evaluation Kit for the MAX31341B

Technical Documents

App Note 7010 Give Your Wearable’s Micro Some Quality Sleep Time
Tutorial 6863 The What, Why, When, Where and How of Real-Time Clocks (RTCs)

Quality and Environmental Data

Request Reliability Report for: MAX31341B 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Related Resources


MAX31341B
Low-Current, Real-Time Clock with I2C Interface and Power Management

  • Increases Battery Life
  • Provides Flexible Configurability
  • Saves Board Space



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05/29/2020 - 05/31/2020, Detroit, MI
2020 Detroit Grand Prix - Chevrolet Detroit Grand Prix presented by Lear Fast Facts The Chevrolet Detroit Grand Prix presented by Lear was hosted on Belle Isle, May 29 - 30 2020. The event featured the cars of the NTT IndyCar Series, the IMSA WeatherTech SportsCar Championship and the Trans Am Series presented by Pirelli. The weekend is collectively referred to as the Chevrolet Detroit Grand Prix presented by Lear and it once again featured the Chevrolet Dual in Detroit IndyCar doubleheader.

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