Analog Devices Inc. MAX31341C Real Time Clock
Analog Devices MAX31341C Real-Time Clock is a low-current time-keeping device that provides nanoamperes time-keeping current by extending battery life. The MAX31341C supports 6pF high-ESR crystals that broaden the pool of usable crystals for the devices. This device is accessed through an I2C serial interface. The MAX31341C real-time clock features one digital Schmitt trigger input and one programmable threshold analog input. This clock 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.
Additionally, this real-time clock features 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 Analog Devices MAX31341C Real-Time Clock operates in a 24-hour format and includes an input for synchronization. Typical applications include medical, wearables, Point-of-Sale (POS), telematics, portable instruments, and audio.
Features
- Increases battery life with a trickle charger for an external supercapacitor or rechargeable battery
- Provides flexible configurability
- Schmitt Trigger input to trigger interrupt
- One analog input with an adjustable threshold to trigger interrupt
- Programmable square-wave output for clock monitoring
- Countdown timer with repeat and pause functions
- Saves board space with integrated load capacitors for crystal oscillator
- Integrated protection
- Power-on reset for default configuration
- Automatic switchover to backup battery or supercapacitor on power fail
- Lockup-free operation with bus timeout
Applications
- Medical
- Wearables
- Point-of-Sale (POS)
- Telematics
- Portable instruments
- Portable audio
Specifications
- 180nA timekeeping current
- Wide range of external crystals with CL = 6pF
- 1.6V to 3.6V operating voltage range
- ESR up to 100kΩ for minimal current draw
- 64byte RAM for user data storage
- Package options
- 2mm × 1.5mm 12-bump WLP with 0.5mm pitch
- 3mm × 3mm 10-pin TDFN
- -40°C to +85°C operating temperature range
Functional Block Diagram
Typical Application Circuit Diagram
Associated Product
Analog Devices Inc. MAX31341 Shield Evaluation Kit
Fully assembled and tested to evaluate the MAX31341C RTCs with I2C interface and power management.
Published: 2020-06-11
| Updated: 2024-05-31