The SiT95901 is an ultra-low power real-time clock (RTC) and calendar device with dual I2C bus support that allows two master devices (i.e., CPU and BMC chip in a server platform) access to the device. The SiT95901 RTC is optimized for low power consumption and has a built-in voltage-level detection circuit that detects power status and voltage level. If the RTC loses its primary power source, the device will automatically switch to the backup battery power supply (VBAT). When operating in battery (VBAT) data retention mode, the device maintains time, date, and alarm operation with very low current consumption.
- Provides year, month, day, weekday, hours, minutes and seconds based on a 32.768 kHz MEMS oscillator or quartz crystal
- Automatic power-level detect and switch circuitry, plus oscillator fail detection function
- Supports battery voltage level measurement
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| "Specs" | "Value" |
|---|---|
| Operating Temperature Range (°C) | -40 to +85 |
| Package Type (mm²) | 3x3 mm, 12-pin DFN |
| Number of Inputs | 1 |
| Number of Outputs | 1 |
| Input Frequency Range | 32.768 kHz |
| Output Type | LVCMOS |
| Output Frequency Range | 32.768 kHz, 1.024 kHz, 32 Hz, 1 Hz |
| Number of PLL/Clock Domains | n/a |
| Phase Jitter (rms) | n/a |
| Voltage Supply (V) | 1.55 to 3.6 |
| Features | Calendar: year, month, day, weekday, hours, minutes, and seconds; Dual I2C bus allow two master devices access to the device |
| Availability | Production |
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3x3 mm, 12-pin DFN Real Time Clock (RTC) package
- Real-time clock (RTC) counts seconds, minutes, hours, day, date, month, and year with leap-year compensation valid up to 2100
- Provides year, month, day, weekday, hours, minutes, and seconds based on a 32.768 kHz MEMS oscillator or quartz crystal
- Support daylight saving mode
- Selectable 24-hour and 12-hour mode
- One time-of-day alarm
- RTC_CLR, ALARM, Oscillator Fail Flag and Interrupt Flag
- Battery-backed 128-byte SRAM
- Dual I2C bus interface with fast mode 400 kHz support
- Device addresses: RTC: 1101 111, SRAM: 1010 111
- RTC_CLR# to clear battery backed RAM
- Supports battery voltage level measurement
- Automatic power-level detect and switch circuitry
- Oscillator fail detection function
- Low current: 1uA (typ.)
- Programmable clock output for test and MFG (32.768 kHz, 1.024 kHz, 32Hz, and 1 Hz)
- ESD protection
- Clock operating voltage: 1.55 V to 3.6 V
- Industrial temperature range (-40 to +85°C)
- Package: 3 mm x 3 mm DFN12
- Computer Servers
- Personal Computing
- I/O Controller Hub
- Unattended Operation Time Products
- Consumer Electronics
- Industrial Control Systems
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