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參數(shù)資料
| 型號： | PCD3349A |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit microcontroller with DTMF generator(帶DTMF發(fā)生器的8位微控制器) |
| 中文描述： | 8位微控制器的DTMF發(fā)生器（帶雙音多頻發(fā)生器的8位微控制器） |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 141K |
| 代理商： | PCD3349A |
1998 May 11
7
Philips Semiconductors
Product specification
8-bit microcontroller with DTMF generator
PCD3349A
6.2
Frequency registers
The two frequency registers HGF and LGF define two
frequencies. From these, the digital sine synthesizers
together with the Digital-to-Analog Converters (DACs)
construct two sine waves. Their amplitudes are precisely
scaled according to the bandgap voltage reference. This
ensures TONE output levels independent of supply
voltage and temperature. The amplitude of the Low Group
Frequency sine wave is attenuated by 2 dB compared to
the amplitude of the High Group Frequency sine wave.
The two sine waves are summed and then filtered by an
on-chip switched capacitor and RC low-pass filters. These
guarantee that all DTMF tones generated fulfil the CEPT
recommendations with respect to amplitude, frequency
deviation, total harmonic distortion and suppression of
unwanted frequency components.
The value 00H in a frequency register stops the
corresponding digital sine synthesizer. If both frequency
registers contain 00H, the whole frequency generator is
shut off, resulting in lower power consumption.
The frequency of the sine wave generated is dependent
upon the decimal value ‘x’ held in the frequency registers
(HGF and LGF), and this may be calculated as follows:
f
23 x
2
+
)
[
]
; where 60
≤
x
≤
255.
The frequency limitation given by x
≥
60 is due to the
low-pass filters which would attenuate higher frequency
sine waves.
6.3
DTMF frequencies
Assuming an oscillator frequency f
xtal
= 3.58 MHz, the
DTMF standard frequencies can be implemented as
shown in Table 3.
The relationship between telephone keyboard symbols
and the frequency register contents are given in Table 4.
f
---------------------------------
=
Table 3
DTMF standard frequencies and their
implementation; value = LGF, HGF contents
Table 4
Dialling symbols, corresponding DTMF
frequency pairs and frequency registers content
VALUE
(HEX)
FREQUENCY (Hz)
DEVIATION
STANDARD
GENERATED
(%)
(Hz)
DD
C8
B5
A3
7F
72
67
5D
697
770
852
941
1209
1336
1477
1633
697.90
770.46
850.45
943.23
1206.45
1341.66
1482.21
1638.24
0.13
0.06
0.18
0.24
0.21
0.42
0.35
0.32
0.90
0.46
1.55
2.23
2.55
5.66
5.21
5.24
TELEPHONE
KEYBOARD
SYMBOLS
DTMF FREQ.
PAIRS
(Hz)
LGF
VALUE
(HEX)
HGF
VALUE
(HEX)
0
1
2
3
4
5
6
7
8
9
A
B
C
D
#
(941, 1336)
(697, 1209)
(697, 1336)
(697, 1477)
(770, 1209)
(770, 1336)
(770, 1477)
(852, 1209)
(852, 1336)
(852, 1477)
(697, 1633)
(770, 1633)
(852, 1633)
(941, 1633)
(941, 1209)
(941, 1477)
A3
DD
DD
DD
C8
C8
C8
B5
B5
B5
DD
C8
B5
A3
A3
A3
72
7F
72
67
7F
72
67
7F
72
67
5D
5D
5D
5D
7F
67
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCD3349 | MINIATURE POWER RELAY |
| PCD3349AP | 8-bit microcontroller with DTMF generator |
| PCD3350AH | 8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock |
| PCD3350A | 8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock |
| PCD3353AH | 8-bit microcontrollers with DTMF generator and 128 bytes EEPROM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCD3349AP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-BIT MICROCONTROLLER WITH DTMF GENERATOR |
| PCD3349AT | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-BIT MICROCONTROLLER WITH DTMF GENERATOR |
| PCD3350A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock |
| PCD3350AH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontroller with DTMF generator, 256 bytes EEPROM and real-time clock |
| PCD3351A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers with DTMF generator and 128 bytes EEPROM |
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