SPF BFT3 02 Optical Bidirectional Transceiver for byteflight SPF BFT3 02 Data Sheet Safety hints Application of new chip technologies leads to increasing optical efficiency and growing and higher levels of optical performance. We therefore recommend that the current versions of the IEC 825-1 and EN 60825-1 standards are taken into account right from the outset, i.e. at the equipment development stage, and that suitable protection facilities are provided. 1. Short description of complete functional unit The device consists of a LED mounted on a large area photodiode for bidirectional optical transmission in half duplex mode. LED and photodiode are driven by the multifunction IC E100.34C1 from ELMOS. The transmitting and receiving functional units with ELMOS-IC E100.34C1 may be split into the following blocks: VDD2 GND Transmitter LED Driver VDD1 DI LEDO Transmitter /Receiver Gate DO LED PDI LEDI Photodiode ALARM Receivingamplifier Fig. 1: Basic functional units of SPF BFT3 02 BFT3 02 data sheet_04_nov_02 page 1 from 13 04-nov-02 SPF BFT3 02 Features • • • • • • • • Optical transmitter and receiver for maximum datarate 10 Mbaud (half duplex burst mode) Transmitter: LED with 650 nm for working in low attenuation range of PMMA fiber Receiver: Photodiode with preamp, digitizer with DC elimination circuit (tracked decision threshold), Sleep - and Wake-up-Function, output stage (electrical output driver) Built in transmitter and receiver gate for half duplex mode (mutual blocking of transmitter and receiver) Operation at 5V or 8V-11V power supply voltage Built in pulse width detection for indicating Sync, Alarm and continuous light on (integrated time basis to differentiate and evaluate Sync, Alarm and Continuous Light conditions Alarm output) Diagnose function for photocurrent Mechanical assembly: 6 Pin CAI package for easy coupling of POF (plastic optical fiber) with insert 2. Basic Specification 2.1 Absolute maximum ratings Note: Usage of the device out of the maximum ranges given in this chapter may damage the transceiver! Parameter Symbol min max Unit Storage Temperature Range TSTG - 40 100 °C Operating Temperature Range TA - 40 85 °C Soldering Temperature TS 235 °C - 5 mW Symbol min max Unit Supply Voltage VDD1 - 0,3 16 V Signal Input DI Vinm - 0,3 6 V Signal Output DO Voutm - 0,3 6 V Output ALARM Voutm - 0,3 16 V tsDO - 1 s - 10 mA (≤ 10 seconds more than 4,5 mm apart from package; details see app. note) Maximum optical input power onto receiver Parameter PoptmaxRec Voltages against GND: 1) Output DO shortening time * Current into Alarm-pin (active Alarm state) IAlarm *1) The electrical output DO may be shortened for a short period of time tsDO. During this time the voltage at DO has to be within 0V <= VDO <= 5V BFT3 02 data sheet_04_nov_02 page 2 from 13 04-nov-02 SPF BFT3 02 2.2 Operating Conditions All the data in this specification refer to the following operating conditions unless otherwise stated. Parameter Symbol min typ max Unit Supply Voltage VDD1 4,75 5 5,5 V Supply Voltage, optional VDD1 7,8 9 11,3 V Datarate DBR 10 Mbit/s Duration of one bit tbit Duration of sync pulse tsync 2,9 3 3,1 µs Duration of Alarm pulse talarm 1,9 2 2,1 µs Bright phase Wake-up Impulse tplwu 6 6,4 6,8 µs Dark phase Wake-up Impulse tpdwu 6 6,4 6,8 µs 100 ns 2.3 Interface Description Pinning Pin 1 2 3 4 5 6 Pin-Name DI ALARM VDD1 VDD2 GND DO Description Signal Input/Data In Alarm out (open drain) positive power supply internally regulated power supply Ground Signal Output/Data out (push-pull) Optical Signals Name LEDO PDI (=LEDI) Description optical Signal, emitted of Transceiver optical Signal, received of Transceiver Light on 1 1 Light off 0 0 Note: Transmitter and Receiver invert the signals, which means that - in standard transmitting mode: low level (0V) at DI causes the illumination of the LED (LEDO „1“ = light on) and vice versa, - in standard receiving mode: no light onto the Photodiode (PDI „0“ = light off) causes output of 5V at DO and vice versa. BFT3 02 data sheet_04_nov_02 page 3 from 13 04-nov-02 SPF BFT3 02 3. Detailed Specification 3.1 Optical Function Transmitter Electrical and Optical Characteristics of LED and Driver: Parameter Conditions Symbol Min. Typ. *2) Data Rate Optical Output Power (peak) 1mm Standard PMMA fiber 30cm optimum coupling, 0h, TA=25°C Optical Output Power (peak) 1mm Standard PMMA fiber 30cm optimum coupling, 0h, -40°C....+85°C Optical Output Power (peak) 1mm Standard PMMA fiber 30cm optimum coupling, over lifetime, -40°C.....+85°C Optical Rise Time, Optical Fall Time 10% to 90% Pulse Width Distortion, Optical Signal Peak emission wavelength +25°C Peak emission wavelength -40°C.....+85°C Popt25 Max. Unit 10 Mbit/s 274 450 740 µW (-5,6) (-3,5) (-1,3) (dBm) Popt-40° - 166 1000 µW +85° (-7,8) (0) (dBm) Popt-40°- 132 1250 µW +85°/life (-8,8) (+1,0) (dBm) tr, tf 35 ns PWDTrans -5 +5 ns λPeak 640 650 660 nm λPeak 630 650 670 nm *2) Limitation due to electrical power dissipation: Duty cycle for > 1s: 10 %, Duty cycle for < 1 s: 50 % 3.2 Optical Function Receiver Electrical and optical characteristics of receiving photodiode with amplifier in high speed data receiving (active) mode: Parameter Conditions Symbol Min. Typ. Data Rate Pulse Width Distortion *3) Pulse Width Start pulse Pmin PWDRec - 25 PW Start 500 Maximum receiveable power Signal at DO according PWDRec Pmax Minimum receiveable power Pmin Signal at DO according PWDRec Recovery time after last transmitted bit *4) *4) trec 600 Max. Unit 10 Mbit/s + 25 ns 660 ns 800 µW (-1,0) (dBm) 20 µW (-17) (dBm) 1,1 µs *3) The Pulse Width Distortion is tested with a worst case pattern at a certain single high pulse P1 of the standard pattern some bits after starting the burst. *4) All Optical Power Data are peak values. BFT3 02 data sheet_04_nov_02 page 4 from 13 04-nov-02 SPF BFT3 02 3.3 Static Characteristics Parameter Condition Symbol Peak Supply Current in active *2) mode (see 2.1, ) LED on Supply current in active mode LED off min typ max Unit Idda 50 mA Idda 10 mA 45 µA Supply current in stand-by mode 10ms after tsleepmax IStby 30 Low Level Input Voltage DI VIL 0 0,8 V High Level Input Voltage DI VICH 2 6 V Low Level Output Voltage DO I = 1mA VOLD 0 0,4 V High Level Output Voltage DO I = -1mA VOHD 3,7 5 V Low Level Output Voltage ALARM I = 5mA VOLA 0 0,4 V CDI PDIAG 5 20 (-17) pF - VDD2 4,6 Symbol min Input Capacitance at DI Optical Power Threshold for photo current diagnosis Internally regulated voltage VDD1=7,8 11,3V 15 (-18,2) 5,5 µW (dBm) V max Unit 200 ns 3.4 Dynamic Characteristics Parameter Condition Signal delay (LEDI -> DO) Rise and fall time on DO typ tdel-DO CL= 30pF tr, tf 30 Wake-up time *5) twu Sleep-in time *6) tsl 10 Continuous light on time *7) tcl 10 Locking time with el. signal *8) tlocke Locking time with opt. signal *8) tlocko Duration of diagnosis impulse tpdi 80 100 twdi 1,17 1,3 tddi 10 Pause before diagnosis impulse Delay diagnosis impulse ns 10 ms 20 ms 15 µs 700 1100 ns 300 700 ns 120 ns 220 ns 11,4 µs *5) Time between the first optical wake-up pattern and switching into active mode *6) Time between transmitting last bit and switching into sleep mode *7) Duration for detection of continuous light *8) After recognizing High levels on the internal data path at the lock switch input (see block wiring diagram), the other relevant channel is blocked for this period. BFT3 02 data sheet_04_nov_02 page 5 from 13 04-nov-02 SPF BFT3 02 4 Functional description 4.1 Block wiring diagram Diagnose LEDI & DO-Treiber DO Peak-Det. Lock Timer VDD1 ModusSteuerung Alarm ALARM Biasgenerator GND Lock Zeitbasis Wake-up Det. DI Inv & LED-Treiber LEDO 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. BFT3 02 data sheet_04_nov_02 page 6 from 13 04-nov-02 SPF BFT3 02 4.2.3 Locking To avoid mutual interference during data transfer, transmitter and receiver are mutually locked. During active level at its input, the functional group identified as lock in the block wiring diagram blocks the other channel. The trailing edge is delayed by tlock and then releases the corresponding channel. Switching can be re-triggered. If H levels occur on both channels at the same time, the channel to be blocked is not defined. 4.2.4 Alarm An alarm is detected if a pulse with pulse length talarm is recognised. The alarm output driver (Open Drain Lowside) is then statically switched on. The driver is switched off as soon as a Sync-Pulse is registered by the receiver, with PON and continuous light and in sleep mode. Alarm is only possible if there was a normal sync pulse received before. 4.2.5 Time basis and timer An internal oscillator establishes the local time basis of the module. In order to achieve the required accuracy, the frequency is individually adjusted on each die. This tuning is made once by the chip manufacturer during the wafer measurement. The timer unit checks all data pulses for their length and distinguishes between sync-pulses, alarm pulses and continuous light. Sync and alarm pulses must fulfil the time conditions stated under 2. Continuous light is recognised at a minimum pulse duration of typical 11,4 µs. For evaluation of continuous light on time 114 pulses of the internal oscillator are counted. The time of period of the internal oscillator may be evaluated according to the following formula: Tosc = tcl / 114 tcl = continuous light on time pulse type alarm min max duration [ns] 2000 1900 2100 max. time of period 129,03 122,58 135,48 min. time of period 85,11 80,85 89,36 sync min max 3000 2900 3100 117,65 113,73 121,57 86,96 84,06 89,86 4.2.6 Mode control The mode control checks and evaluates the signals of the timer unit and the power-on signal. The following actions are triggered on dependence of the result of the evaluation: - Power-On When the operating voltage is applied, a PON signal is generated internally. This resets all functional units and normal mode is taken by th IC. The alarm output is inactive. A Power-On signal is generated at each raising of VDD2. Moreover, a Power-On signal is created when the power supply goes in the controlled mode up to VDD1 overriding a threshold of 7V. The internal reset signal is created by prolongation of the Power-On signal with 3,4 ms. DO and LEDO are locked during the reset. - Sync pulse In normal mode, the sync pulse simply passes through to the output. If an alarm pulse has previously been identified, the alarm condition is cleared and the alarm output is switched off. BFT3 02 data sheet_04_nov_02 page 7 from 13 04-nov-02 SPF BFT3 02 - Alarm pulse In normal mode, after an alarm pulse has been identified, the alarm condition is accepted and the alarm output is switched on. If further alarm pulses are identified, the alarm condition is sustained. It is possible to clear the alarm condition by receiving a valid sync pulse or by PON or by reached sleep mode or if continuous light is identified. In the alarm condition, data transfer takes place exactly as in normal mode. After Wake-up or PON the Alarm-Output is activated not before the recognising of the first Sync-Pulse. Sync Sync Alarm Alarm Sync opt. Bus Alarmausgang - Continuous light If continuous light is identified on the bus (light duration > continuous light on time), the electrical output DO is blocked in order to avoid a blockade of the entire bus. An existing alarm condition is cleared. The block for DO is cleared if a valid sync or alarm pulse is identified on the electrical or optical inputs and if there is no continuous light at the receiver any more. Continuous light can only be identified by the optical receiver. 4.2.7 Sleep-Mode and Wake-up After the time tsl. the IC/circuit changes his internal status to the sleep mode if no light is present and also if continuous light is present. In the sleep mode, only a very slow receiver and the wake-up detector are active, in order to achieve very low power consumption. The receiving diode integrates signals at the optical input. If the wake-up level is exceeded, the wakeup detector activates the chip. For wake-up via a optical way, continuously alternating dark/bright pulses are necessary for the duration of twu. The timing of these pulse has to be according the spec under chapter 2 (parameter: bright phase wake-up impulse, dark phase wake-up impulse). The wake-up signal has the function of a reset and is prolonged by 3,4 ms in order to give the analogue components enough time for switching on. This time (3,4 ms) is in twu contained. After wake up the continuous light recognising is locked without delay. There are 8 pulses on the optical input needed to activate the continuous light recognizing. This is to avoid a incorrect continuos light recognising during the wake-up. An activation also occurs when an H/L flank appears at DI. Pulses at DI are suddenly working at LEDO. For the optical way the reset prolongation is valid at wake-up via DI. Due to transient response, the first databits are transferred of the chip after activation maybe incorrectly. BFT3 02 data sheet_04_nov_02 page 8 from 13 04-nov-02 SPF BFT3 02 4.2.8 Photocurrent indication The logic of the IC (internal analog diagnosis) is able to recognize photocurrents, which lie below a certain predefined value. This feature accomplishes to issue a early warning if the optical link gets worse. In case of low photocurrent at first there is no difference to the normal receiving mode. If the module goes in transmitting mode the following warning is given: 1. The transceiver is testing if there was a pause of minimum 13 clockcycles of the internal oscillator (typ. 1,3 µs) the time ahead of the High/Low-transition on DI 2. If this break was recognized and L -level is on DI, than at DO after tddi there is a pulse of minimum 1 clock cycle of the internal oscillator (typ. 100ns). This pulse has to be detected from the connected interface module. With this feature a low level of photocurrent can always be detected during the start sequence or during the sync pulse if the transceiver is in transmitting mode. Fotocurrent normal DO DI Fotocurrent too small DO typ. 100 ns DI min. 13 int. clock cycle (typ. 1,3 us) min. 2 int. Clock cycle (typ. 200 ns) 4.3 ESD – Protective connection All input and output pins of the IC have protective connections internally. ESD protective connections are tested in accordance with EOS/ESD-DS5.3 (SDM; Socketed Device Model) under the following conditions: VIN = 250/500/1000Volt BFT3 02 data sheet_04_nov_02 page 9 from 13 04-nov-02 SPF BFT3 02 5. Application Circuitry Looking to the optical interface the following application circuitry should be used: 1 2 3 Pin 1 Pin-Name DI 2 ALARM 3 VDD1 4 VDD2 5 6 GND DO 4 5 6 comment/requirement connection with 470 Kohm to VDD2 or 10 KOhm to external 5 V; Note: maximum signal input voltage at DI is 6 V! open drain output with minimum 2 KOhm to Vdd=9V or with minimum 1 KOhm to Vdd=5V so that maximum current at Alarm=0V is 5 mA power supply (5 V or 9 V), connected with 100 nF...1µF depending on application and 100 µF (ESR @ 120Hz < 18,6 Ohm, ESR @ 10kHz < 9,5 Ohm, over hole temperature range, critical at –40°C) block capacitors to Ground connected with 220 nF....1µF (depending on application) block capacitor to Ground short, direct connection to System Ground Signal Output/Data out (push-pull) BFT3 02 data sheet_04_nov_02 page 10 from 13 04-nov-02 SPF BFT3 02 6. Mechanical Design BFT3 02: CAI package (cavity as interface) For further details refer to separate drawings. BFT3 02 data sheet_04_nov_02 page 11 from 13 04-nov-02 SPF BFT3 02 7. History Index ELMOS IC Revision device identification comments, cause of change, important differences to last status xx BFT003 01 E100.34A E100.34A2 E100.34C1 02 E100.34C1 BFT3 02 IC version E100.34A til Okt. 2002 without index First release of index for BFT3 with ELMOS IC100.34C1 Leadframe of Byteflight with Sn-Plating instead of SnPb („Green product“) BFT3 01 BFT3 02 data sheet_04_nov_02 page 12 from 13 04-nov-02 SPF BFT3 02 Notes: BFT3 02 data sheet_04_nov_02 page 13 from 13 04-nov-02