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TC534 Scheda tecnica(PDF) 11 Page - TelCom Semiconductor, Inc |
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TC534 Scheda tecnica(HTML) 11 Page - TelCom Semiconductor, Inc |
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11 / 15 page  3-57 TELCOM SEMICONDUCTOR, INC. 7 6 5 4 3 1 2 8 5V PRECISION DATA ACQUISITION SUBSYSTEMS TC530 TC534 verter input. A0 is the least significant address bit (i.e., channel 1 is selected when A0 = 1 and A1 = 0). The multiplexer is designed to be operated in a differential mode. For single-ended inputs, the CHx– input for the channel under selection must be connected to the ground reference associated with the input signal. EOC R/W RESET DCLK DIN 1 1001111 AZ AZ LOAD VALUE MSB LSB INT DINT IZ AZ… Conversion Phase Timing Status Converter held in AZ state due to RESET = 1 Write LOAD VALUE to Serial Port Power-up RESET Undefined Converter in Normal Service R/W brought LOW during AZ for serial port write cycle R/W = HIGH strobes LOAD VALUE into timebase and starts conversion Continuous Conversions Figure 4. TC530/534 Initialization and Load Value Write Cycle EOC OVR POL MSB LSB R/W DCLK DOUT Figure 5. Serial Port Data Read Cycle DC/DC Converter An on-board, TC7660H-type charge pump supplies negative bias to the converter circuitry, as well as to external devices. The charge pump develops a negative output voltage by moving charge from the power supply to the reservoir capacitor at VSS by way of the commutating capacitor connected to the CAP+ and CAP– inputs. The charge pump clock operates at a typical frequency of 100kHz. If lower quiescent current is desired, the charge pump clock can be slowed by connecting an external ca- pacitor from the OSC pin to VDD. Reference typical charac- teristics curves. APPLICATIONS Design Example Figure 6 shows a typical TC534 interrupt-driven applica- tion. Timing and component values are calculated from equations and recommendations made in the Dual Slope Integrating Converter and Programming the TC530/534 sections of this document. The EOC connection to the processor INT input is for interrupt-driven applications only. (In polled systems, the EOC output is available on DOUT). GIVEN REQUIRED RESOLUTION: 16 Bits (65,536 counts.) MAXIMUM VIN: ±2V POWER SUPPLY VOLTAGE: +5V 60Hz SYSTEM 1. Pick Integration time (tINT) 66msec 2. Estimate crystal frequency FIN = 2R/tINT = 2 x 65536/66 x 10 –3 = 1.98MHz (use 2MHz) |
Codice articolo simile - TC534 |
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