PCD3316 datasheet(10/30 Pages) PHILIPS

10 / 30 page

Philips Semiconductors

PCD3316

CIDCW receiver

Product speciﬁcation

11 March 1999

10 of 30

9397 750 04824

7.11 32 kHz oscillator

The 32.768 kHz oscillator is enabled permanently and is used to generate either a

1 second or 1 minute interrupt. The 32.768 kHz clock is also used for the ‘Ring or

polarity change detector’, the ‘Low battery detection’ and the ‘Level detect’ function.

An external 32.768 kHz signal may be applied to pin LXIN while leaving pin LXOUT

not connected.

The 32 kHz oscillator requires an external 32.768 kHz quartz crystal and an external

feedback resistor (4.7 M

Ω) between the LXIN and LXOUT pins (see Figure 8).

7.12 Serial interface

The serial interface of the PCD3316 is the I2C-bus. A detailed description of the

I2C-bus speciﬁcation, including applications, is given in the brochure:

The I2C-bus

and how to use it, order no. 9398 393 40011 or I2C Peripherals Data Handbook IC12.

7.12.1

Characteristics of the I2C-bus

For the I2C-bus conﬁguration see Figure 9. A device generating a message is a

‘transmitter’, a device receiving a message is the ‘receiver’. The device that controls

the message is the ‘master’ and the devices which are controlled by the master are

called the ‘slaves’. The PCD3316 operates in the slave transmitter/receiver mode

only.

The I2C-bus is for bidirectional, two-line communication between different ICs or

modules. The two lines are a serial data line (SDA) and a serial clock line (SCL). Both

lines must be connected to a positive supply via a pull-up resistor. Data transfer may

be initiated only when the bus is not busy.

Fig 8.

Connections of the 32 kHz oscillator.

handbook, halfpage

MGK724

32.768 kHz

OSCILLATOR

LXIN

LXOUT

PCD3316

4.7 M

Ω

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