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參數(shù)資料
| 型號： | EM78810 |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | 8-Bit Micro-Controller for Telecom Product(工作電壓2.5V-6V的8位呼叫識別的RISC型微控制器) |
| 中文描述： | 8位微控制器的電信產品（工作電壓為2.5V到6V的8位呼叫識別的的RISC型微控制器） |
| 文件頁數(shù)： | 19/31頁 |
| 文件大?。?/td> | 191K |
| 代理商： | EM78810 |
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* This specification are subject to be changed without notice.
9.30.1997
EM78810
8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT
Ring detect circuit
Fig14. ring detect circuit
When Vdd is applied to the circuit, the RC network will charge cap C1 to Vdd holding /RING TIME off . If /
FSKPWR is also held at GND, the whole circuit will be in a power down mode, and will consume less than 1uA
of supply current.The resistor network R2 to R4 attenuates the incoming power ring applied to the top of R2. The
values given have been chosen to provide a sufficient voltage at pin3, to turn on the Schmitt trigger input. When
Vt+ of the Schmitt is exceeded, cap C1 will discharge. This will initialize a partial power up,and enable the ring
detect circuit.
The value of R1 and C1 must be chosen to hold the /RING TIME pin voltage below the Vt+ of the Schmitt
between the individual cycle of the power ring. The values shown will work for ring frequencies of 15.3 Hz
minimum.
With /RINGTIME enabled, a portion of the power ring above 1.2V is fed to the ring counter circuit. This circuit
is a digital integrator. When the input signal at pin4 is above 1.2V,the integrator is counting up at 800 Hz rate.
Otherwise, counting down at 1022Hz rate. A ring is qualified when an internal count of binary 48 is reached and
disqualified when an internal count below binary 48.
Once the ring signal is qualified, the /RING INDICATOR will sent low. This can be fed back to /FSKPWR or
can be used as an interrupt to an MCU. Once the /FSKPWR pin is higher than Vt+, the part will fully powered
up, and ready to receive FSK.
DTMF ( Dual Tone Multi Frequency ) Tone Generator
Built-in DTMF generator can generate dialing tone signals for telephone of dialing tone type. There are two kinds
of DTMF tone . One is the group of row frequency, the other is the group of column frequency, each group has
4 kinds of frequency , user can get 16 kinds of DTMF frequency totally. DTMF generator contains a row
frequency sine wave generator for generating the DTMF signal which selected by low order 4 bits of RB and a
column frequency sine wave generator for generating the DTMF signal which selected by high order 4 bits
of RB. This block can generate single tone by filling one bit zero to this register.
If all the values are high , the power of DTMF will turn off until one or two low values.
Either high or low 4 bits must be set by an effective value, otherwise, if any ineffective value or both 4 bits are
load effective value, tone output will be disable. Recommend value refer to table as follow please
/FSKPWR
Vdd
/Ring Time
pin3
/Ring det1
pin4
/ring det2
Vref
1.2V
Ring
Counter
power up
logic
to Ring
Detect out
C1
R3
R4
R1
R2
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相關代理商/技術參數(shù) |
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| EM78811 | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:8-BIT MICRO-CONTROLLER FOR TELECOM PRODUCT |
| EM78815 | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:8 Bit Microcontroller |
| EM78815AQ | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:8 Bit Microcontroller |
| EM78815BQ | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:8 Bit Microcontroller |
| EM78815H | 制造商:EMC 制造商全稱:ELAN Microelectronics Corp 功能描述:8 Bit Microcontroller |
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