TC520ACOE Microchip

TC520A Serial Interface Adapter for TC500 A/D Converter Family Features General Description Converts TC500/TC500A/TC510/TC514 to Serial The TC520A serial interface adapter provides logic Operation control for Microchip s TC500/TC500A/TC510/TC514 family of dual slope, integrating A/D converters. It Programmable Conversion Rate and Resolution for directly manages TC500 converter phase control sig- Maximum Flexibility nals A, B and CMPTR, thereby reducing host Supports up to 17-Bits of Accuracy Plus Polarity Bit processor task loading and software complexity. Com- Low Power Operation: Typically 7.5m munication with the TC520A is accomplished over a 3 14-Pin PDIP or 16-Pin SOIC Packages wire serial port. Key converter operating parameters Polled or Interrupt Mode Operation are programmable for complete user flexibility. Data input is brought conversion is initiated when the CE Applications low. The converted data (plus overrange and polarity bits) are held in an 18-bit shift register until read by the Computer Peripheral Interface processor or until the next conversion is completed. Portable Instruments Data may be clocked out of the TC520A at any time, Data Acquisition System Interface and at any rate, the user prefers. A Data Valid (DV) out- put is driven active at the start of each conversion Device Selection Table cycle, indicating the 18-bit shift register update has just been completed. This signal may be polled by the pro- Part Number Package Temperature Range cessor or can be used as data ready interrupt. The TC520ACOE 16-Pin SOIC (Wide) 0 C to +70 C TC520A timebase can be derived from an external fre- quency source of up to 6MHz or can operate from its TC520ACPD 14-Pin PDIP 0 C to +70 C own external crystal. It requires a single 5V logic supply and dissipates less than 7.5m . Package Type 14-Pin PDIP V114 DD CE DGND213 DV CMPTR312 LOAD B411 TC520A D IN 510 A DCLK OSC69 D OUT OUT OSC78 READ IN 16-Pin SOIC V 1 16 CE DD 2 DGND 15 DV 3 CMPTR 14 LOAD 4 B 13 D IN TC520A 5 A 12 DCLK OSC 6 11 OUT D OUT OSC 7 10 IN READ 8 9 N/C N/C 2001-2012 Microchip Technology Inc. DS21431C-page 1TC520A Functional Block Diagram 1 V DD Pinout of 14-Pin 2 GND Package 11 D IN 8-Bit Shift Reg. Gate 8 Gate 8-Bit Counter 256 5 Timeout A Force Auto Zero 4 12 B LOAD 3 Polarity Bit Logic Control CMPTR 9 D 14 OUT 18-Bit Shift Register CE 10 Gate D 13 Clear Count CLK DV 16 7 OSC SYSCLK IN 16-Bit Counter Gate 4 Overrange 6 OSC OUT Bit 8 READ DS21431C-page 2 2001-2012 Microchip Technology Inc.