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Real-time Clock Module(I2C bus) PT7C4910/0909/4908 |
The PT7C4908,4909 and 4910 series are I2CTM-compatible real-time clocks (RTCs) with a microprocessor supervisor, optional trickle charger (PT7C4910 only), backup power source, and NV RAM controller. The PT7C49xx provides alarm outputs to indicate a crystal failure, a switchover to battery power, and time and date indication.
The NV RAM is 31 bytes of static RAM that are available for scratchpad storage.
This series RTC also built in frequency calibration function by writing register to change Cg and Cd to guarantee high precision frequency understand some temperature range.
Target Applications
1.Power Meter
2.Point-of-Sales equipment
3.PMP/PSP/MP4 Handheld instruments
4. Datacom(Router, Ethernet Switch, AN)
Datasheet:PT7C4909/4910 |
|
Part No. |
Alarm Interrupt |
Frequency Calibration |
Reset Output |
Watch dog |
Volage Detect Reset |
NV RAM |
Compatible |
Package |
| PT7C4908R/S |
√ |
√ |
√ |
－ |
√ |
31x8 |
－ |
SOIC16 |
| PT7C4909R/S |
√ |
√ |
√ |
√ |
√ |
31x8 |
MAX6909 |
QSOP20 |
| PT7C4910R/S |
√ |
√ |
√ |
√ |
√ |
31x8 |
MAX6910 |
QSOP20 |
Note: R: Reset Threshold of 2.63V; Operation Voltage of 3.0V.
S: Reset Threshold of 2.93V; Operation Voltage of 3.3V. |
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