Making analog-to-digital conversion poller based on CS5501 chip

Memory chip

The HC high level is specified as 0.7 times the power supply voltage, and the low level is specified as 0.3 times the power supply voltage. The HC pull-up pull-down capability is the same. The HC input resistance is very high and the level is not fixed when the input is open. The 74HC series, which features low power consumption in CMOS and high speed equivalent to 74LS, is a high-speed, low-power product. The 74HC series and 74LS have operating frequencies below 30mHz, and 74ALS is slightly higher, up to 50mHz. The operating voltage is quite different: the 74LS series is 5V, and the 74HC series is 2~6V. Fan-out capability: The 74LS series is 20, while the 74HC series is up to 1000 or more in DC, but it is very low during AC, which is determined by the operating frequency. Both 74hc and 74hct are high-speed CMOS devices, which are the same series, in which the 74hct input signal is TTL level. Both 74hc and 74hct are high-speed CMOS devices, which are the same series, in which the 74hct input signal is TTL level.
Since the CS5501 type 16 has no "start conversion" command for the analog-to-digital converter, it continuously converts every 1024 cycles of the main clock, and sends a conversion word to its output register, but when a standard JK is triggered After the device is connected to the circuit, the converter can output a single conversion word only when it is rotated.
The CS5501 converter can operate in asynchronous communication mode to transfer a 16-bit conversion word when it is rotated through the RS232 serial interface line. Sending a null character to the circuit is set by the bistable flip-flop FF2. At this time, the CS5501 can output a single conversion word and use it as two bytes with start and stop bits through the RS232 serial interface. The line is sent out.
The 74HC4040 is the counter/divider for this analog-to-digital converter that provides the serial port clock (SLCK). The baud rate of this circuit can be set by selecting the corresponding clock division ratio. The above-mentioned wheeled mode mode of operation is also practical when the converter's output registers are configured to operate in Synchronous Serial Clock (SSC) mode, in which case the converter will be directed to a 16-bit serial-to-parallel register if necessary. (Two 74H595 type 8-bit registers) Output one word.