NXP Semiconductors
PCF2120
Quartz oscillator
7.2 Pin description
Table 3.
Symbol
n.c.
OSCI
OSCO
n.c.
VSS
n.c.
TEST
CLKOUT
VDD
CLKOE
Pin description
Pin
Pad
Description
HVSON10 Wire bond die
1
-
not connected
2
1
oscillator input
3
2
oscillator output
4
-
not connected
5
3
ground
6
-
not connected
7
4
test pin
8
5
clock output (push-pull)
9
6
supply voltage
10
7
clock output enable input
8. Functional description
The 32 kHz quartz oscillator is optimized for directly connecting to a 32 kHz tuning fork
quartz crystal. No additional tuning capacitors are required. Laser tuning of the quartz or
quartz selection for matching is used to tune the oscillator if required.
A digital 32 kHz signal is available on pin CLKOUT. The signal on pin CLKOE is used to
gate and synchronize the 32 kHz CLKOUT signal. Pin CLKOUT is a CMOS push-pull
output. If disabled, it goes to LOW level.
(1)
OSCO-
internal
32 kHz
CLKOE
CLKOUT
001aaf633
(1) OSCO-internal 32 kHz signal: internal signal after the Schmitt trigger connected to pin OSCO.
Fig 4. CLKOUT output signal
PCF2120_1
Product data sheet
Rev. 01 — 5 February 2008
© NXP B.V. 2008. All rights reserved.
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