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參數資料
| 型號： | PCA3354C |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit microcontrollers with DTMF generator and 256 bytes EEPROM |
| 中文描述： | 8 -雙音多頻發電機和256字節EEPROM位微控制器 |
| 文件頁數： | 9/32頁 |
| 文件大小： | 221K |
| 代理商： | PCA3354C |
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1996 Dec 18
9
Philips Semiconductors
Product specification
8-bit microcontrollers with DTMF
generator and 256 bytes EEPROM
PCA3354C; PCD3354A
If EDCO = 1 and DIV3 = 1 in the MDYCON register:
a square wave with the frequency f
DTMF
=
1
3
×
f
xtal
is
output on the derivative port line DP1.7/DCO. If EDCO = 1
and DIV3 = 0: a square wave with the frequency
f
DTMF
= f
xtal
is output on the derivative port line
DP1.7/DCO.
The melody output drive depends on the configuration of
port P1.7/MDY, see Chapter 13, Table 24.
6.4
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 ‘f’ of the sine wave generated from either of
the frequency registers is a function of the clock frequency
‘f
xtal
’ and the decimal value ‘x’ held in the register.
The equation relating these variables is:
; 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.
6.5
DTMF frequencies
Assuming an oscillator frequency f
xtal
= 3.58 MHz, the
DTMF standard frequencies can be implemented as
shown in Table 6.
The relationship between telephone keyboard symbols,
DTMF frequency pairs and the corresponding frequency
register contents are given in Table 7.
f
f
23 x
2
+
)
[
]
--------------------------------
=
Table 6
DTMF standard frequencies and their
implementation; value = LGF, HGF contents
Table 7
Dialling symbols, corresponding DTMF
frequency pairs and frequency register contents
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
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相關代理商/技術參數 |
參數描述 |
|---|---|
| PCA3354CH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit microcontrollers with DTMF generator and 256 bytes EEPROM |
| PCA36-0 | 制造商:Panduit Corp 功能描述:B-ID |
| PCA36-1 | 制造商:Panduit Corp 功能描述:B-ID |
| PCA-36-2 | 制造商:Panduit Corp 功能描述: |
| PCA36-2 | 制造商:Panduit Corp 功能描述: |
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