V3021SO8A EMMICRO [EM Microelectronic - MARIN SA], V3021SO8A Datasheet - Page 4

• Manufacturer Part Number: V3021SO8A
• Description: Ultra Low Power 1-Bit 32 kHz RTC
• Manufacturer: EMMICRO [EM Microelectronic - MARIN SA]

The V3021 will run slightly too fast, in order to allow the
user to adjust the frequency, depending on the mean
operating temperature.
adjustment can only work by lowering the frequency with
an added capacitor between XO and V
Typical Frequency on I/O Pin
Quartz Characteristics
Copyright © 2005, EM Microelectronic-Marin SA
Typical drift for ideal 32'768 Hz quartz
R
This is made since the crystal
SS
. The printed
Note : The trimming capacitor value must not exceed
15 pF. Greater values may disturb the oscillator
function
∆F/F
T
T
To determine the clock error (accuracy) at a given
temperature, add the frequency tolerance at 25°C to the
value obtained from the formula above.
circuit
consideration. The V3021 in DIL 8 package, running with
an 8.2 pF crystal at room temperature, will be adjusted to
better
∆
F
O
O
4
F
O
= -0.038
=
=
=
capacitance
than
the ratio of the change in frequency to the
nominal value expressed in ppm (it can be
thought of as the frequency deviation at any
temperature)
the temperature of interest in °C
the turnover temperature (25 ± 5°C)
ppm
°
C
±1s/day
2
(T – T
has
with
O
)
2
also
± 10%
a
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to
6.8
be
V3021
pF
taken
capacitor.
Fig. 3
Fig. 4
into