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參數(shù)資料
| 型號(hào)： | SPFBFT302 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 英文描述： | Optical Bidirectional Transceiver for byteflight |
| 中文描述： | 光纖雙向收發(fā)器的byteflight |
| 文件頁數(shù)： | 6/13頁 |
| 文件大?。?/td> | 205K |
| 代理商： | SPFBFT302 |
SPF BFT3 02
BFT3 02 data sheet_04_nov_02
page
6
from 13
04-nov-02
4 Functional description
4.1 Block wiring diagram
&
Timer
Modus-
Steuerung
Zeitbasis
DO-Treiber
Lock
&
Lock
LED-Treiber
Inv
Alarm
Biasgenerator
LEDI
VDD1
GND
DI
DO
ALARM
LEDO
Peak-Det.
Wake-up Det.
Diagnose
4.2 Functional description
The IC comprises of the functional groups as shown in the block wiring diagram which are defined in
more detail below.
The following applies in standard mode:
Low level to Dl means LED driver is active and therefore the LED is emitting light.
If light falls onto the photodiode, the DO driver becomes active and produces low level on DO.
4.2.1 Receiver component
The preamp and booster in the receive component forms a current/voltage converter which converts
the photo current from the receive diode into a voltage. The functional group peak detector ensures a
signal-dependent tracking of the reference voltage and compensates destructive offset influences like
dark current of the photodiode. In the Sleep mode, the receiver operates at a very low supply current.
Signal wake-up sequences are integrated and if the wake-up threshold is exceeded, the active mode is
switched on.
The DO output stage is a Push /Pull (active L, inactive H). The driver can be blocked by the transmitter
component.
4.2.2 Transmitter component
The electrical signal to DI is inverted and sent to the LED Driver via a AND logic gate. The LED driver
supplies the transmit diode with a typical current of 30mA (peak). The driver can be blocked by the
receiver part.
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