PCA2129 datasheet(64/84 Pages) NXP

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PCA2129

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Product data sheet

Rev. 5 — 19 December 2014

64 of 84

NXP Semiconductors

PCA2129

Automotive accurate RTC with integrated quartz crystal

13.2 Frequency characteristics

[1]

1 ppm corresponds to a time deviation of 0.0864 seconds per day.

[2]

Only valid if CLKOUT frequencies are not equal to 32.768 kHz or if CLKOUT is disabled.

[3]

Not production tested. Effects of reflow soldering are included (see Ref. 3 “AN11186”).

Table 80.

Frequency characteristics

VDD = 1.8 V to 4.2 V; VSS =0V; Tamb =+25 C, unless otherwise specified.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

output frequency

on pin CLKOUT;

VDD or VBAT = 3.3 V;

COF[2:0] = 000;

AO[3:0] = 1000

32.768

kHz

f/f

frequency stability

VDD or VBAT = 3.3 V

Tamb =+23 C (2 C)

[1][2] -

3

5.8

ppm

Tamb = 30 C to +80 C

[1][2] -

3

8ppm

Tamb = 40 Cto 30 C

and

Tamb =+80 Cto+85 C

[1][2] -

5

15

ppm

f

xtal/fxtal

relative crystal

frequency variation

crystal aging

first year

[3] --

3ppm

ten years

8ppm

f/V

frequency variation

with voltage

on pin CLKOUT

1-

ppm/V

(1) Typical temperature compensated frequency response.

(2) Uncompensated typical tuning-fork crystal frequency.

Fig 43. Typical characteristic of frequency with respect to temperature of PCA2129

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