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參數(shù)資料
| 型號： | PCD3312CT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | DTMF/modem/musical-tone generators |
| 中文描述： | TELEPHONE MULTIFUNCTION CKT, PDSO8 |
| 封裝： | PLASTIC, SOT176-1, SOP-8 |
| 文件頁數(shù)： | 7/28頁 |
| 文件大?。?/td> | 176K |
| 代理商： | PCD3312CT |
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1996 Nov 21
7
Philips Semiconductors
Product specification
DTMF/modem/musical-tone generators
PCD3311C; PCD3312C
Fig.5
Timing of STROBE, parallel data inputs and TONE output (770 Hz + 1477 Hz in example) in the parallel
mode (MODE = HIGH).
handbook, full pagewidth
MGG511
tSPW
tDS
tDH
90%
10%
oscillator ON
no output tone
oscillator ON
output tones
oscillator OFF
ttone (ON)
STROBE
D0
D1
D2
D3
D4
D5
TONE
7.6
I
2
C-bus clock and data inputs
SCL and SDA are the serial clock and serial data inputs
according to the I
2
C-bus specification, see Chapter 8.
SCL and SDA must be pulled up externally to V
DD
.
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
I
2
C-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 V
DD
(HIGH) and V
SS
(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 V
DD
or V
SS
.
7.8
I
2
C-bus data configuration
(see Fig.6)
The PCD3311C and PCD3312C are always slave
receivers in the I
2
C-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.
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