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參數(shù)資料
| 型號(hào)： | U3810BM |
| 英文描述： | Multi Standard Feature Phone Integrated Circuit |
| 中文描述： | 多標(biāo)準(zhǔn)功能手機(jī)集成電路 |
| 文件頁數(shù)： | 9/31頁 |
| 文件大?。?/td> | 497K |
| 代理商： | U3810BM |
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TELEFUNKEN Semiconductors
U3810BM
Rev. A1: 19.01.1996
9 (31)
Pin description
Pin
37
Symbol
C
Function
Clock line: 2-wire serial bus. This pin is used together with the data input (pin 36) to
transfer data from the microprocessor to the circuit. The last 8 bits, consisting of 5 data
bits and 3 address bits, are accepted by the circuit if, during the high phase at pin 37, a
positive edge on pin 36 takes place.
Line voltage information output. State indicator of the line voltage, VL, and the supply
voltage, VDD. Indicates to microprocessor whether line voltage VL is present across
the circuit and the supply voltage VDD is sufficiently high. If both conditions are
fulfilled, LVIO is on high level.
Clock output. Output 455 kHz clock pulse for the microprocessor. The 455 kHz clock
signal generated in the circuit is amplified and sent to CO. This signal is delivered to
the microprocessor as a clock signal. Various internal signals can be output to CO in
test mode.
Reset signal for periphery. A reset signal (active low) is generated to clear all registers
of the circuit. This can be tapped by peripheral modules, particularly by the micropro-
cessor. This pin enables synchronous resetting of the circuit and peripheral modules.
Clock signal generator. Connector for ceramic resonator (455 kHz). The clock for the
digital part of the circuit is generated by a one-pin oscillator, the frequency of which is
determined by the ceramic resonator.
Input for external supply information. Input to indicate the operating state external
supply. In the case of VSA supplied by a power supply unit, the supply source is con-
nected directly to ESI. ESI is connected to VSA by an external diode in forward mode.
The ESI voltage will be one forward voltage higher than the voltage on VSA. This
voltage causes the circuit to be in external supply mode.
Zero crossing output in ringing phase. ZCO operates when the ringer voltage, VRI, and
the supply voltage, VSA, are sufficiently high. The output voltage ZCO changes state
each time the rectified AC signal of THA crosses the ringing detect turn–on and turn–
off thresholds, thus providing information on the frequency of the ring signal. Further
analysis of the ring frequency is be done by the microprocessor. Secondly, this pin is
used as an input for switching on the test mode. Therefore, a negative voltage of
approximately 1 V must be applied to pin 43.
Ringing detection threshold adjustment. Input amplitude and frequency identification.
The rectified ringing voltage is present at this pin. The circuit evaluates the amplitude
of the rectified voltage at THA and the supply voltage VSA (pin 13 ). If both voltages
exceed certain thresholds, the signal present at THA is converted to a rectangular–
pulse signal and is sent via pin 43 to the microprocessor. If the frequency is in the
required range, the microprocessor initiates transmission of the ringing signal. The start
threshold can be raised with a resistor connected in series to pin 44.
38
LVIO
39
CO
40
RESET
41
XCK
42
ESI
43
ZCO
44
THA
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