Datasheet

Biasing
and
amplitude
control
32 kHz to
digital block
VRTC
OSC32KOUTOSC32KIN
SWCS049-014
REFGND
C
OSCIN
C
OSCOUT
Q
TPS659110, TPS659112, TPS659113, TPS659116
www.ti.com SWCS049L –JUNE 2010–REVISED MARCH 2014
32-kHz RTC Clock (continued)
Figure 15. Crystal Oscillator 32-kHz Clock
8.7 Real-Time Clock (RTC)
The RTC, which is driven by the 32-kHz clock, provides the alarm and timekeeping functions. The RTC is kept
supplied when the device is in the OFF or the BACKUP state.
The main functions of the RTC block are:
• Time information (seconds/minutes/hours) directly in binary-coded decimal (BCD) format
• Calendar information (Day/Month/Year/Day of the week) directly in BCD code up to year 2099
• Programmable interrupts generation: The RTC can generate two interrupts: a timer interrupt
RTC_PERIOD_IT periodically (1s/1m/1h/1d period) and an alarm interrupt RTC_ALARM_IT at a precise time
of the day (alarm function). These interrupts are enabled using IT_ALARM and IT_TIMER control bits.
Periodically interrupts can be masked during the SLEEP period to avoid host interruption and are
automatically unmasked after SLEEP wakeup (using the IT_SLEEP_MASK_EN control bit).
• Oscillator frequency calibration and time correction
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