PCD3311 Просмотр технического описания (PDF) - Philips Electronics
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PCD3311 Datasheet PDF : 28 Pages
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Philips Semiconductors
DTMF/modem/musical-tone generators
Product specification
PCD3311C; PCD3312C
handbook, full pagewidth
STROBE
D0
90%
10%
tDS
tSPW
tDH
D1
D2
D3
D4
D5
TONE
MGG511
ttone (ON)
oscillator OFF
oscillator ON
no output tone
oscillator ON
output tones
Fig.5 Timing of STROBE, parallel data inputs and TONE output (770 Hz + 1477 Hz in example) in the parallel
mode (MODE = HIGH).
7.6 I2C-bus clock and data inputs
SCL and SDA are the serial clock and serial data inputs
according to the I2C-bus specification, see Chapter 8.
SCL and SDA must be pulled up externally to VDD.
For the PCD3311C, SCL and SDA are combined with
parallel inputs D0 and D1 respectively - D0/SCL and
D1/SDA operate serially only when MODE is LOW.
7.7 Address input
Address input A0 defines the least significant bit of the
I2C-bus address of the device (see Fig.6). The first 6 bits
of the address are fixed internally. By tying the A0 of each
device to VDD (HIGH) and VSS (LOW) respectively, two
different PCD3311C or PCD3312C devices can be
individually addressed on the bus.
Whether one or two devices are used, A0 must be
connected to VDD or VSS.
7.8 I2C-bus data configuration (see Fig.6)
The PCD3311C and PCD3312C are always slave
receivers in the I2C-bus configuration. The R/W bit in is
thus always LOW, indicating that the master
(microcontroller) is writing.
The slave address in the serial mode consists of 7 bits: 6
bits internally fixed, 1 externally set via A0. in the serial
mode, the same input data codes are used as in the
parallel mode. See Tables 2, 3, 4 and 5.
7.9 Tone output
The single and dual tones provided at the TONE output are
first filtered by an on-chip switched-capacitor filter,
followed by an active RC low-pass filter. The filtered tones
fulfil the CEPT recommendations for total harmonic
distortion of DTMF tones. An on-chip reference voltage
provides output tone levels independent of the supply
voltage. Tables 3, 4 and 5 give the frequency deviation of
the output tones with respect to the standard DTMF,
modem and music frequencies.
1996 Nov 21
7
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