pcd3312c NXP Semiconductors, pcd3312c Datasheet - Page 7

• Manufacturer Part Number: pcd3312c
• Description: Dtmf/modem/musical-tone Generators
• Manufacturer: NXP Semiconductors

Philips Semiconductors
7.6
SCL and SDA are the serial clock and serial data inputs
according to the I
SCL and SDA must be pulled up externally to V
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 A0 defines the least significant bit of the
I
of the address are fixed internally. By tying the A0 of each
device to V
different PCD3311C or PCD3312C devices can be
individually addressed on the bus.
Whether one or two devices are used, A0 must be
connected to V
1996 Nov 21
2
C-bus address of the device (see Fig.6). The first 6 bits
DTMF/modem/musical-tone generators
Fig.5
I
Address input
2
C-bus clock and data inputs
Timing of STROBE, parallel data inputs and TONE output (770 Hz + 1477 Hz in example) in the parallel
mode (MODE = HIGH).
DD
handbook, full pagewidth
(HIGH) and V
DD
2
or V
C-bus specification, see Chapter 8.
SS
.
SS
(LOW) respectively, two
STROBE
TONE
D0
D1
D2
D3
D4
D5
MGG511
t DS
10%
90%
DD
.
t SPW
oscillator OFF
t DH
7
7.8
The PCD3311C and PCD3312C are always slave
receivers in the I
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
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.
no output tone
oscillator ON
t tone (ON)
I
Tone output
2
C-bus data configuration (see Fig.6)
oscillator ON
output tones
2
C-bus configuration. The R/W bit in is
PCD3311C; PCD3312C
Product specification