Automotive: Body Computer



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Maxim > Solutions > Automotive: Body Computer

Real-Time Clock (RTC)

Challenges: Needs to reliably operate autonomously in rugged environment with large temperature variations. Must be small and have low quiescent current.

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Title / Parts

Key Advantages

QV PDF

Extremely Accurate I²C-Integrated RTC/TCXO/Crystal
DS3231

The DS3231 is the single-most integrated solution for accurate timekeeping in the electronics industry.

QV PDF

I²C Serial Real-Time Clock
DS1337, DS1337C

Industry's Smallest I²C RTC with Two Time-of-Day Alarms

Key Specifications: Oscillator Modules

Part Number

Frequency

Oscillator Type

Tuning Adjustment Type

Frequency Output Type

Freq. Stability vs. Temp. @0 to +40°C (±ppm)

Freq. Stab. vs.Temp. @-40 to 0/ +40 to 85°C (±ppm)

Frequency Stability vs. Supply Voltage (±ppm/V)

Frequency Stability vs. Aging (±ppm)

Supply Voltage (V)

DS3231

32.768kHz

TCXO

Digital

CMOS Open-Drain

3.5

1 (typ)

5 (0-10 Years)

2.3 to 5.5
3
3.3
5

See All Oscillator Modules (28)

Key Specifications: Timekeeping & Real-Time Clocks

Part Number

Date/ Time Format (hh = sec/100)

Interface

Supply Voltage (V)

Time- keeping Current (typ) (nA)

C_L, Load Capacitance (pF)

Memory Type

Number of Time of Day Alarms

DS3231

YY-MM-DD/ HH:MM:SS

I²C

2.3 to 5.5
3
3.3
5

840

None

DS1337

YY-MM-DD/ HH:MM:SS

I²C

2
3
3.3
5

425

None

See All Timekeeping & Real-Time Clocks (85)