U2532B

U2532B TEMIC | Alldatasheet

Document overview

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Technical content

Features

/C0068Data rates up to 115.2 kbit/s /C0068Wide supply voltage range (3 to 5.5 V) /C0068AGC for EMI immunity /C0068AGC reset /C0068High and low sensitivity mode /C0068BER < 1E-9 in the low sensitivity mode /C0068Power-On reset

Applications

/C0068IR data transmission /C0068Compatible to IrDA /C0068Bidirectional IR data transmission /C0068Ability to receive ASK modulation Case: SO16 Driver Amp (AGC) ST V CC R L RxD TxD 95 10210SC Reset Figure 1.

Figure 2. Pinning

1 P_GND Power ground

2 TxD Transmitter input

3 RxD Receiver output

4 Reset AGC-Reset

5 V CC Supply voltage

6 SC Sensitivity Control

9 IN Photodiode input

11 A_GND Analog ground

14 O_GND Output ground

15 IRED IR-Emitter

Figure 3. Block diagram

Rev. A1, 27-Sep-96 3 (10) Functionality of the Various Circuit Blocks Transimpedance Amplifier (TIA) The input stage provides the necessary bias voltage for the photodiode and ensures decoupling of the useful signal. This involves processing the dc and ac portions in sepa- rate parts of the circuit, BIAS (Bias voltage) and TIA. The BIAS circuit separates the dc part (sunlight, incandescent light) from the input signal. The ac portion of the input current is fed to an inverting amplifier with a sufficiently low input impedance (TIA). The TIA prevents the signal slopes to be negatively affected by the junction capaci- tance of the photodiode. Controlled Gain Amplifier (CGA) The CGA consists of two differential amplifiers. The total gain is 17 in the high sense mode (Sensitivity Control In- put “High”) and can be reduced to 8 if the Sensitivity Control Input is set to “Low”. In the low sense mode a BER of 1E-9 is guaranteed. In the high sense mode eventually generated output pulses must be suppressed by software handling. The lower and upper cut-off frequen- cies of the amplifier are 25 kHz and 900 kHz respectively. Additionally the overall gain can be attenuated by 30 dB in 2 dB steps. The attenuation is digi- tally controlled by the AGC (Automatic Gain Control) circuit. Comparator (COMP) The comparator compares the output signal of the CGA to an internal threshold voltage. The output of that comparator is directly connected to an collector output stage. An internal pull up resistor of 20 k/C0087 is provided. Automatic Gain Control (AGC) The AGC adjusts the sensitivity of the receiver according to the strength of the incoming signals. When the input signal increases, the amplification of the CGA is reduced to a value where a BER < 1E-9 is still guaranteed, but sig- nals from disturbers can be effectively suppressed. With this feature a proper data transmission can be maintained also in the presence of energy saving lamps and ceiling lamps that are common in offices. The dynamic range of the AGC is max. 30 dB. This provides the ability to sup- press also strong disturbers. As the AGC acts when the input signal increases, the transmission distance is re- duced if disturbances have to be suppressed. The AGC is digitally controlled and therefore not dependent on any time constant. The amplification of the CGA is set at ev- ery input pulse or input burst for ASK-modulation and is maintained until the next input signal is detected. The sig- nal strength determines whether to reduce, increase or maintain the gain. If no input signal is detected in 18 ms, the AGC considers the data transmission to be finished and increases the gain by a 2 dB step. Within every 18 ms the gain is increased by an additional 2 dB step, until the maximum gain of the CGA is reached. If a “High” signal is applied at the reset (Pin 4), the AGC is set to maximum sensitivity. Incoming signals don‘t influence the AGC. Under this biasing condition it is possible to get maximum transmission distance also in the presence of a known strong disturber, if of course the signals of the disturber can be succesfully suppressed by software handling in the microprocessor. During “Power-On” the AGC is set to maximum sensitivity. The gain of the AGC is maintained while the transceiver is transmitting. Transmitter IRED Driver (DRV) The IRED driver DRV is also monolithically integrated on the transceiver chip providing a high impedance input to drive a fast IR emitter diode. The “active high” input signal drives the output stage. This stage mainly consists of an input amplifier and an open collector NPN transistor that is saturation controlled. The output transistor is capa- ble of driving a lood current up to 1 A.

Rev. A1, 27-Sep-96 Preliminary Information 4 (10) Absolute Maximum Ratings All voltages are referred to A_GND (Pin 11). Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit Supply voltage Pin 5 V CC –0.5 6 V Transmitter input voltage Pin 2 VIN(TxD) –0.5 V CC +0.5 V Sensitivity control voltage Pin 6 VSC –0.5 V CC +0.5 V Reset voltage Pin 4 V(Reset) –0.5 V CC +0.5 V Receiver output voltage Pin 3 VO(RxD) –0.5 V CC +0.5 V LED driver Pin 15 V(TxD) –0.5 6 V Input currents Pins 2, 4, 6 and 15 1 mA Receiver sinking current Pin 3 IL(RxD) 10 mA Photodiode input Pin 9 V IN –0.5 V CC V Power dissipation Ptot 75 mW Junction temperature Tj 150 °C Ambient temperature range Tamb –40 125 °C Storage temperature range Tstg –40 150 °C Soldering temperature 230 °C Average driver current Pin 15 Id(DC) 100 mA Repeated pulsed driver c.< 90 /C0109s, ton < 20%, Pin 15 Id(RP) 500 mA Peak driver current < 2 /C0109s, ton < 10%, Pin 15 Id(PK) 1 A Thermal Resistance Parameters Symbol Value Unit Junction ambient R thJA 180 K/W

Rev. A1, 27-Sep-96 5 (10)

Electrical Characteristics

Test conditions: VCC = 5 V , Tamb = 25°C, unless otherwise specified Parameters Test Conditions / Pins Symbol Min. Typ. Max. Unit Receiver Supported data rates 2.4 115.2 kbit/s Supply voltage range Pin 5 V CC 3 5 5.5 V Supply current Pin 5 IS 1.3 2.5 mA Sensitivity control voltage “Low” Low sense mode Pin 6 VSC 0.2 0.5 V Sensitivity control voltage “High” High sense mode Pin 6 VSC 2.0 V CC V Input threshold current SC > 0.5 V V CC = 3 V Pin 9 ilNmin 60 90 nA Input threshold current SC > 2.4 V , VCC = 3 V Pin 9 ilNmin 30 45 nA Input threshold current for ASK modulation SC < 0.5 V or open V CC = 3 V Pin 9 ilNmin (ASK) 200 400 nA Input threshold current for ASK modulation SC < 2.4 V or open V CC = 5 V Pin 9 ilNmin (ASK) 120 250 nA Max. signal pulse input current Sensitivity independent Pin 9 ilNmax 6 mA DC input current VIN > 0 V Pin 9 IIN 200 /C0109A Output voltage RxD Non active Pin 3 VOH V CC –0.5 V Output voltage RxD Active; IL = 4 mA Pin 3 VOL 0.2 0.5 V Rise time C = 15 pF,R = 2.2 k/C0087 Pin 3 tr 0.5 /C0109s Fall time C = 15 pF,R = 2.2 k/C0087 Pin 3 tf 0.3 /C0109s Output pulse width 2.4 kbit/s, 78 /C0109s pulse width Pin 3 tp 7 15 /C0109s Output pulse width 115.2 kbit/s, 1.6 /C0109s pulse width Pin 3 tp 2.5 4 /C0109s Output delay time 115.2 kbit/s, 1.6 /C0109s pulse width – Output level 0.5 /C0032 VCC – Leading edges of signals – Related to optical input Pin 3 td 1 2 /C0109s Jitter 115.2 kbit/s, 1.6 /C0109s pulse width – Period of 10 bits, all “ones” – Leading edges of signals Pin 3 tj 2 /C0109s AGC dynamic range Pin 3 30 dB AGC single step Pin 3 2 dB Max. reset time 15 steps, covering full dy- namic range of AGC Pin 3 treset 270 400 ms

Rev. A1, 27-Sep-96 Preliminary Information 6 (10) UnitMax.Typ.Min.SymbolTest Conditions / PinsParameters Transmitter Output voltage IRED “Low” Id = 300mA with appropri- ate current limiting resistor Pin 15 VOL(TxD ) 0.3 0.5 V Logic “Low” transmitter input voltage Pin 2 VIN (TxD) 0.4 0.8 V Logic “High” transmitter input voltage Pin 2 VIN (TxD) 2 V CC V Output leakage current VO(TxD) = 6 V Pin 15 Id0 10 /C0109A Output rise time Id = 300 mA Pin 15 tr 300 ns Output fall time Id = 300 mA Pin 15 tf 300 ns Output pulse width 115.2 kbit/s 1.6 /C0109s pulse width Pin 15 tp 1.4 1.6 2.7 /C0109s Overshoot over final current Pin 15 /C0100Id 25 % Jitter 115.2 kbit/s, 1.6 /C0109s pulse width –Period of 10 bits, all “ones” – Leading edges of signals Pin 15 tj 0.2 /C0109s

Rev. A1, 27-Sep-96 Preliminary Information 8 (10) Application Circuit The diagram below shows the typical application for the IC U2532B. The detector diode and IR emitter can also be obtained from TEMIC. As emitter a high speed in- frared emitting diode like TSHF5400 is recommended. For improving output power two diodes can be connected in series. An external current limiting resistor is used to adjust the appropriate forward current. The resulting cur- rent of the emitter, with the settings RL = 5 /C0087 and V CC = 5 V , is Id = 300 mA and the corresponding typical radiant intensity of a single diode is IE = 120 mW/sr. The IR radiation detector BPV22NF is a high speed and high sensitive PIN photodiode in a plastic package with a spherical side view lens. Because of a large radiant sen- sitive area of A = 7.5 mm 2 a typical output current of Ira = 85 /C0109A with Ee = 1 mW/cm 2 and /C0108 = 870 nm is achieved. A transmitting distance of approximately 3.5 m is possible. Rs and C are the low pass filter network to sup- press power supply noise and other disturbances. At pin RxD the output signal can be received. Optionally an external load resistor can be connected from pin 3 to V CC , if a smaller pull up resistor than 20 k/C0087 is desired. U2532B TxD RxD Reset SC /C0109C 100 /C0087 R S R L 5 /C0087 C 470 nF VCC (5 V) TSHF 5400 BPV22NF 95 10212 Figure 8.

Rev. A1, 27-Sep-96 9 (10) Dimensions in mm 94 8875 Figure 9.

Rev. A1, 27-Sep-96 Preliminary Information 10 (10) Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2831, Fax number: 49 (0)7131 67 2423