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| SensComp, Inc. 36704 Commerce Rd. Livonia, MI 48150 Telephone: (734) 953-4783 Fax: (734) 953-4518 www.senscomp.com Digital Chip TL851 SensComp Electronic Component - TL851 Digital Integrated Circuit Features: Features Economical Ranging Control when used with Analog IC PID# 614906 (through-hole). or PID# 629409 (SMT). Operates With Single Supply Voltage. Measurement Control Range from 6 inches to 35 feet. Multiple Target Detection Interfaces to Electrostatic and Piezoelectric Transducers. Synchronous 4-bit Gain Control Output(12 steps). Internal 1.2 volt Level Detector. Accurate Clock Output For External Use. TTL Compatible. Specifications Part No. PID# 614903 - Digital IC TL851 - 16 pin SOIC (SMT) package PID# 614904 - Digital IC TL851 - 16 pin N (thru-hole) package Description The TL851 is an economical digital I2L ranging control integrated circuit designed for use with the SensComp 614906 sonar ranging receiver integrated circuit. The TL851 is designed for distance measurement from 6 inches to 35 feet. The device has an internal oscillator that uses a low-cost external ceramic resonator. With a simple interface and a 420 kHz ceramic resonator, the device will drive a 50 kHz electrostatic transducer. The device cycle begins when initiate (INIT) is taken to the high logic level. There must be at least 5 ms from initial power up (Vcc) to the first initiate signal in order for all the device internal latches to reset and for the ceramic resonator controlled oscillator to stabilize. The device will transmit a burst of 16 pulses each time INIT is taken high. The oscillator output (OSC) is enabled by INIT. The oscillator frequency is the ceramic resonator frequency divided by 8.5 for the first 16 cycles (during transmit) and then the oscillator frequency changes to the ceramic resonator frequency divided by 4.5 for the remainder of the device cycle. When used with an external 420 kHz ceramic resonator, the device internal blanking disables the receive input (REC) for 2.38 ms after initiate to exclude false receive inputs that may be caused by transducer ringing. The internal blanking feature also eliminates echoes from objects closer than 1.3 ft. from the transducer. If it is necessary to detect objects closer than 1.3 feet then the internal blanking may be shortened by taking the blanking inhibit (BINH) high, enabling the receive input. The blanking input (BLNK) may be used to disable the receive input and reset ECHO to a low logic level at any time during the device cycle for selective echo exclusion or for a multiple-echo mode of operation. The device provides a synchronous 4-bit gain control output (12 steps) designed to control the gain of the TL852 sonar ranging receiver integrated circuit. The digital gain control waveforms are shown on page 4, with the nominal transition times from INIT listed in the Gain Control Output Table on page 3. The threshold of the internal receive level detector is 1.2 volts. The TL851 operates over a supply voltage range of 4.5 volts to 6.8 volts (+5 volts DC nominal voltage) and is characterized for operation from 0C to 40C. For more information, visit our website: www.senscomp.com Copyright (c) 2004 SensComp, Inc. 4/28/04 TL851 Digital IC -- page 2 Absolute Maximum Ratings over Operating Free-Air Temperature Range Voltage at any pin with respect to ground.......................................................................... -0.5 to +7.0 VDC Voltage at any pin with respect to VCC .............................................................................. -7.0 to +0.5 VDC Continuous power dissipation at (or below) 25 C free-air temperature (see note)....................... 1150 mW Operating free-air temperature range ...................................................................................... 0 C to 70 C Storage temperature range ................................................................................................. -65 C to 150 C Lead temperature 1.6 mrn (1/16 inch) from case for 10 seconds...................................................... 260 C Note: For operation above 25 C, derate linearly at the rate of 9.2 mW/C Recommended Operating Conditions MIN Supply Voltage, Vcc High-level Input Voltage, VIH Low-level Input Voltage, VIL ECHO and OSC Output Voltage Delay Time, Power Up to INIT High Operating Free-air Temperature BLNK, BINH, INIT BLNK, BINH, INIT 4.5 2.1 MAX 6.8 0.6 6.8 5 0 40 UNIT V V V V ms C Electrical Characteristics over Recommended Ranges of Supply Voltage and Operating Free-Air Temperature (typical values at VCC = 5VDC and TA = 25 C) PARAMETER Input Current High-level Output Current, IOH On-state Output Current Internal Blanking Interval Frequency During 16-pulse Transmit Period Frequency After 16-pulse Transmit Period Supply Current, Icc OSC output XMIT output OSC output XMIT output During transmit period After transmit period These typical values apply for a 420 kHz ceramic resonator BLNK, BINH, INIT ECHO, OSC, GC* XMIT output TEST COND. VI = 2.1 V VOH = 5.5V IO L= 1.6 mA VO = 1V -140 2.38 49.4 49.4 93.3 0 260 55 MIN TYP MAX 1 100 0.4 UNIT mA A V mA ms kHz kHz kHz kHz mA mA Low-level Output Voltage, VOL, ECHO, OSC, GC* Pinout Description Pin 1 2 3 4 5 6 7 8 Name VCC XMIT GND GCD GCA GCB GCC REC Description Positive Supply Transmit Circuit Ground MSB Digital Gain Control LSB Digital Gain Control Digital Gain Control Digital Gain Control Receive Input (analog level) Pin 16 15 14 13 12 11 10 9 Name BLNK BINH INIT FIL XTAL1 XTAL2 OSC ECHO Description Blanking Blanking Inhibit Ranging Initiate VCC Filter Crystal Input Crystal Input Oscillator Clock Output Echo Detected (digital level) For more information, visit our website: www.senscomp.com 4/28/04 TL851 Digital IC -- page 3 FUNCTIONAL BLOCK DIAGRAM For more information, visit our website: www.senscomp.com 4/28/04 TL851 Digital IC -- page 4 Digital Gain Control Waveforms Example of a Single-Echo-Mode Cycle when used with the TL852 Reciever and 420 kHz Ceramic Resonator Typical Inputs and Outputs For more information, visit our website: www.senscomp.com 4/28/04 |
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