The traditional A/D converters mainly include ADC0808, ADC0809, etc. These A/D converters are connected to the MCU by a parallel port, which occupies a large amount of I/O port resources of the MCU. To this end, the digital voltmeter designed with TLC549 can better solve the above problems.
TLC549 is an A/D converter from TI that has the following features:
(1) TLC549 is an 8-bit serial A/D converter;
(2) can be connected to the single chip through three-wire serial communication;
(3) With 4MHz on-chip system clock and software and hardware control circuits;
(4) The conversion time is up to 17 μs;
(5) The maximum allowable conversion rate is 40,000 times/s;
(6) The total offset error is at most ±0.5LSB;
(7) Typical power consumption value is 6mW;
(8) Adopt differential reference voltage high-impedance input, strong anti-interference ability, and can calibrate the conversion range according to the proportional range;
(9) When VREF- is grounded, VREF+-VREF-≥1V can be used for sampling of smaller signals.
1, TLC549 pin arrangement and useThe pin arrangement of TLC549 is shown in Figure 1. ANALOGIN is the analog input, CS is the chip select, DATAOUT is the serial output of the A/D conversion result, I/OCLOCK is the I/O clock, and REF+ is positive. The reference voltage terminal, REF- is the negative reference voltage terminal, VCC is the power supply terminal, and GND is the ground.
Figure 1 TLC549 pin diagram
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The internal structure of the TLC549 is shown in Figure 2. It contains internal circuit circuits such as clock circuits and 8-bit analog-to-digital converters.
Figure 2 Internal structure of TLC549
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