SWCS049E datasheet(55/119 Pages) TI1

55 / 119 page

Biasing

and

Amplitude

Control

32 kHz to

Digital Block

VRTC

OSC32KOUT

OSC32KIN

SWCS049-014

REFGND

OSCIN

OSCOUT

TPS659110, TPS659112, TPS659113

TPS659114, TPS659118, TPS6591133

www.ti.com

SWCS049Q – JUNE 2010 – REVISED MARCH 2016

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Product Folder Links: TPS659110 TPS659112 TPS659113 TPS659114 TPS659118 TPS6591133

Detailed Description

Figure 6-4. Crystal Oscillator 32-kHz Clock

6.7

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 state 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

SWCS049E Datasheet(PDF) 55 Page - Texas Instruments