13892 datasheet(52/161 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

13892

FUNCTIONAL DEVICE OPERATION

CLOCK GENERATION AND REAL TIME CLOCK

Figure 10. SRTC block diagram

VSRTC

The VSRTC regulator provides the CLK32KMCU output level. It is also used to bias the Low Power SRTC domain of the SRTC

module integrated on certain FSL processors. The VSRTC regulator is enabled as soon as the RTCPORB is detected. The

VSRTC cannot be disabled.

REAL TIME CLOCK

A real Time Clock (RTC) function is provided including time and day counters as well as an alarm function. The utilizes a

32 kHz clock, either the RC oscillator or the 32.768 kHz crystal oscillator as a time base, and is powered by the coin cell backup

supply when BP has dropped below operational range. In configurations where the SRTC is used, the RTC can be disabled to

conserve current drain by setting the RTCDIS bit to a 1 (defaults on at power up).

TIME AND DAY COUNTERS

The 32 kHz clock is divided down to a 1.0 Hz time tick which drives a 17 bit Time Of Day (TOD) counter. The TOD counter

counts the seconds during a 24 hour period from 0 to 86,399, and will then roll over to 0. When the roll over occurs, it increments

Table 17. VSRTC Specifications

Parameter

Condition

Min

Typ

Max

Units

General

Operating Input Voltage Range,

VINMIN to VINMAX

Valid Coin Cell range or valid BP

1.8

3.6

UVDET

4.65

Operating Current Load Range ILMIN

to ILMAX

μA

Bypass Capacitor Value

1.0

μF

Active Mode - DC

Output Voltage VOUT

VINMIN < VIN < VINMAX

ILMIN < IL < ILMAX

1.150

1.20

1.25

Active Mode Quiescent Current

VINMIN < VIN < VINMAX

IL = 0

0.8

1.0

μA

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