AM3359 datasheet(111/256 Pages) TI1

111 / 256 page

VDDS_RTC

RTC_XTALOUT

CAP_VDD_RTC (min.)

Time

VSS_RTC

VDDS_RTC (min.)

VSS_RTC

CAP_VDD_RTC

111

AM3359, AM3358, AM3357, AM3356, AM3354, AM3352, AM3351

www.ti.com

SPRS717L – OCTOBER 2011 – REVISED MARCH 2020

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Power and Clocking

(1)

Initial accuracy, temperature drift, and aging effects should be combined when evaluating a reference clock for this requirement.

Table 6-5. OSC1 Crystal Circuit Requirements

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

ƒxtal

Crystal parallel resonance

frequency

Fundamental mode oscillation only

32.768

kHz

Crystal frequency stability

and tolerance(1)

Maximum RTC error = 10.512 minutes

per year

–20.0

20.0

ppm

Maximum RTC error = 26.28 minutes per

year

–50.0

50.0

ppm

CC1

C1 capacitance

12.0

24.0

CC2

C2 capacitance

12.0

24.0

Cshunt

Shunt capacitance

1.5

ESR

Crystal effective series

resistance

ƒxtal = 32.768 kHz, oscillator has nominal

negative resistance of 725 kΩ and worst-

case negative resistance of 250 kΩ

kΩ

Table 6-6. OSC1 Crystal Circuit Characteristics

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

Cpkg

Shunt capacitance of

package

ZCE package

0.17

ZCZ package

0.01

Pxtal

The actual values of the ESR, ƒxtal, and CL should be used to yield a

typical crystal power dissipation value. Using the maximum values

specified for ESR, ƒxtal, and CL parameters yields a maximum power

dissipation value.

Pxtal = 0.5 ESR (2 π ƒxtal CL

VDDS_RTC)2

tsX

Start-up time

Figure 6-14. OSC1 Start-up Time

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