TRAC-S2

TRAC-S2 ZETEX | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 8

Technical content

The TRAC family of Field Programmable Analog Devices offers an integrated path from signal processing problems to working silicon solutions - in minutes! The Totally Reconfigurable Analog Circuit is a highly flexible single chip solution to the signal processing problems found in many markets. Introducing a Top-Down, Structured design discipline, TRAC enables rapid implementation, prototyping and product release. Rather than working at the component level, TRAC champions the Computational Approach, providing designers with benefits formerly associated only with programmable digital devices. TRAC brings a truly integrated Signal Processing problem solving process, offering a path to Custom Silicon for higher volume users. TRAC devices have to be loaded with program data at power-up and run from a split 5V supply. By integrating the loading interface circuitry, voltage regulation, supply monitoring and thermal protection, the TRAC support circuit (TRAC-S2) further simplifies circuit integration and interface with memory devices. An adjustable frequency oscillator clocks program data out of a serial output memory device and into any number of cascaded TRAC devices. By monitoring the bit stream pattern, TRAC-S2 can sense when loading is complete and stop clocking automatically. An adjustable ‘rail-splitter’ generates the ground supply rail, and the supply monitoring function initiates program load on power-up, and after power failure or serious fluctuation. Thermal shutdown further protects the device against overheating. FEATURES & BENEFITS /G01 Makes designing TRAC circuits easier, production prototyping quicker /G01 Reduces component count and manufacturing costs /G01 Enables simple connection of a serial output EEPROM or other memory device to TRAC /G01 Compatible with current and future TRAC devices /G01 Automatic program loading at power-up /G01 Supply monitor function reloads program after power failure or fluctuation /G01 Frequency of on-chip oscillator user-defined /G01 Senses number of cascaded TRAC devices automatically /G01 Automatically stops clocking when program loading complete /G01 Simplifies generation of TRAC supply voltages /G01 Ground voltage user defined /G01 Thermal shutdown function protects against overloading due to circuit failures /G01 Full industrial temperature range

ORDERING INFORMATION

TRAC® SUPPORT CIRCUIT ISSUE 1 - JANUARY 2000 TRAC-S2

Operating Temperature Range -40°C to 85°C Storage Temperature Range -55°C to 125°C

ELECTRICAL CHARACTERISTICS

Test Conditions: Temperature=25°C, VDD=5V, VSS=0V, CLCR_IN=0V, 100nF between AGND_OUT and VSS, unless otherwise stated. PARAMETER CONDITIONS MIN TYPICAL MAX Supply Voltage Operating Range 4.8V 5.0V 5.2V Supply Current Standby (CLCR_IN = 0V) Clocking (CLCR_IN = 5V) 1.5mA 2.9mA 1.9mA 3.7mA 2.8mA 5.5mA RAIL SPLITTER SETV(Input Current) SETV = 2.50V 50nA 200nA AGND_OUT (Output Voltage) SETV = 2.50V (No Load) SETV = 2.0V (No Load) 2.49V 1.99V 2.50V 2.00V 2.51V 2.01V AGND_OUT (Output Voltage) SETV = 2.50V; ISINK = 20mA SETV = 2.50V; ISOURCE = 20mA AGND_OUT - 0.010V AGND_OUT + 0.010V SUPPLY MONITOR RESET_OUT (Threshold Voltage) High State Output (VDD increasing) Low State Output (VDD decreasing) 4.35V 4.35V 4.67V 4.65V 4.75V 4.75V RESET_OUT (Hysteresis) 0.01V 0.02V 0.08V RESET_OUT (Onstate output sink current) VDD = RESET_OUT = 4V 0.14mA RESET_OUT (Offstate output current) VDD = RESET_OUT = 5V 0.18mA PROPAGATION DELAY VDD step from 5.0V to 4.0V 1/G01 S PROGRAMMING LOGIC CLK_OUT (Frequency) 2.2nF between CAP and VSS CLCR_IN = 5V 7kHz 10kHz 15kHz CLK_OUT (Max Programming Frequency) 47pF between CAP and VSS CLCR_IN = 5V 200kHz CLK_OUT (High output voltage) 2.2nF between CAP and VSS CLCR_IN = 5V 3.90V 4.10V 4.50V NOT CLK_OUT(Frequency) 2.2nF between CAP and V SS CLCR_IN = 5V 7kHz 10kHz 15kHz NOT CLK_OUT(High output voltage) 2.2nF between CAP and VSS CLCR_IN = 5V 4.00V 4.20V 4.60V TRAC-S2

Test Conditions: Temperature=25°C, VDD=5V, VSS=0V, CLCR_IN=0V, 100nF between AGND_OUT and VSS, unless otherwise stated. DATA_OUT(Frequency) 2.2nF between CAP and V SS CLCR_IN = 5V 1.7kHz 2.5kHz 4.0kHz DATA_OUT(High output voltage) 2.2nF between CAP and VSS CLCR_IN = 5V 3.90V 4.10V 4.50V SELECT (Output Voltage) 2.2nF between CAP and VSS CLCR_IN = 5V 4.8V 4.99V 5.00V DESCRIPTION OF PIN FUNCTIONS Inputs SETV Defines the AGND_OUT voltage. Normally set by potential divider CLCR_IN Active high to enable clock CAP Capacitor to VSS sets clock frequency Outputs AGND_OUT Analog Ground. Able to source and sink current SELECT Active high when CLCR_IN is logic high. Enables memory device CLK_OUT Fed to EEPROM clock input NOT CLK_OUT Fed to TRAC clock input DATA_OUT CLK_OUT divided by four. Fed to serial output memory device RESET_OUT Reset for TRAC Support Circuit and TRAC devices General notes for the TRAC Support Circuit /G01 An on-chip oscillator produces the output CLK_OUT and NOT CLK_OUT. CLCR_IN must be logic high (VDD) to activate CLK_OUT and NOT CLK_OUT /G01 The CLK_OUT output frequency is divided by four to give the DATA_OUT output. Therefore CLCR_IN must be logic high (VDD) to activate DATA_OUT /G01 For AGND_OUT stability under load, a 100nF capacitor is required between AGND_OUT and VSS TRAC-S2

Description of the TRAC Support Circuit 1) Rail Splitter This section provides the analog ground rail between the 5V supply. An external potential divider can be connected to the SETV pin which enables AGND_OUT to be set to the desired potential. The output stage of the rail splitter has been designed to provide power capabilities for 4 TRAC devices and accompanying circuitry. The circuit has low output resistance enabling a drive capability of +/- 20mA. 2) Supply Monitor This section utilises the precision ZSM560 supply monitor design. The RESET_OUT provides a signal to reset all the devices included in the programming and operation of TRAC . This ensures that all devices are switched on and off simultaneously. 3) Programming Logic This section provides TRAC and memory with the signals required for programming. The clock is generated on chip, with the frequency set by an external capacitor. The DATA_OUT signal is generated by dividing the clock frequency by 4. This provides the code to initialise an EEPROM and prompt it to output data. The SELECT pin enables EEPROM chip select. This section also takes an input signal from the final TRAC device, CLCR_IN. This signal is normally ‘high’ and goes ‘low’ when programming is complete, and is used to terminate the CLK_OUT and DATA_OUT signals. BLOCK DIAGRAM

Connections between the support circuit, the EEPROM and the TRAC device are shown above. For a more detailed explanation of the circuit see the application note AN27, “How to use the TRAC support chip”. This also shows the circuit required to program multiple TRAC devices. LIST OF COMPATIBLE MEMORY DEVICES ST9346CB1 (SGS-Thomson) 93LC46B (Microchip) NM92C46 (National Semiconductor) TRAC-S2

PIN No.1 IDENTIFICATION RECESS FOR PIN 1 A B D J E F G C K QSOP16 PIN Millimetres Inches MIN MAX MIN MAX A 4.80 4.98 0.189 0.196 B 0.635 0.025 NOM C 0.177 0.267 0.007 0.011 D 0.20 0.30 0.008 0.012 E 3.81 3.99 0.15 0.157 F 1.35 1.75 0.053 0.069 G 0.10 0.25 0.004 0.01 J 5.79 6.20 0.228 0.244 K0 ° 8° 0° 8° TRAC-S2 Zetex plc. Fields New Road, Chadderton, Oldham, OL9-8NP, United Kingdom. Telephone: (44)161 622 4422 (Sales), (44)161 622 4444 (General Enquiries) Fax: (44)161 622 4420 Zetex GmbH Zetex Inc. Zetex (Asia) Ltd. These are supported by Streitfeldstraße 19 47 Mall Drive, Unit 4 3510 Metroplaza, Tower 2 agents and distributors in D-81673 München Commack NY 11725 Hing Fong Road, major countries world-wide Germany USA Kwai Fong, Hong Kong /G01 Zetex plc 2000 Telefon: (49) 89 45 49 49 0 Telephone: (631) 543-7100 Telephone:(852) 26100 611 Fax: (49) 89 45 49 49 49 Fax: (631) 864-7630 Fax: (852) 24250 494 Internet:http://www.zetex.com This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service.