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PCF2120U

Quartz oscillator

NXP Semiconductors. 

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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