MAX31331EWC+T

MAX31331EWC+T is an ultra-low-power, I²C real-time clock and power management device. It is a time-keeping device that consumes nominal 65nA timekeeping current, extending battery life. The MAX31331 supports a wide range of 32.768kHz crystals. A crystal with any capacitive loading (CL) spec can be used, which broadens the pool of usable crystals for this device. This device is accessed through an I²C serial interface. The device also features a backup supply pin (VBAT) and automatically switches over to the backup supply (VBAT) when the main supply (VCC) drops below the programmed threshold voltage and the backup supply (VBAT) voltage. Other features include two time-of-day alarms, interrupt outputs, programmable square-wave output, event detection input with timestamping, and a serial bus timeout mechanism. The 32-byte timestamp registers double as RAM storage. The Applications include medical, wearables, portable instruments, telematics, industrial, IoT.

• Timekeeping supply voltage range from 1.1 to 5.5V (TA = -40°C to +85°C)
• Automatic switchover to backup supply on power fail event
• Trickle charger for external supercapacitor or rechargeable battery
• No external load capacitors required
• Wide range of external crystals supported (no external loading required)
• Maximum supply switchover slew rate is 0.5V/ms typ (TA = -40°C to +85°C)
• Interface supply voltage range from 1.62 to 5.5V (full operation, TA = -40°C to +85°C)
• Event detection with dedicated pin, timestamps for various events, low battery voltage detection
• 1/128 second register, alarms and countdown timer, 32-byte User RAM
• 12-WLP package, extended operating temperature range from -40°C to +85°C