Maxcompute is a chip that converts the rs232 signal level (-10, + 10 v) of a computer serial port to the TTL signal point (0, + 5) used by a single-chip microcomputer, the price of this chip is about 6 yuan. Next I will introduce the maxcompute pin diagram, the connection circuit between maxcompute and the computer serial port, and the RS232 pin definition. ************************ * ** Maxcompute chip is the interface circuit specially designed by meixin for the standard serial port of computer RS-232, use a single power supply of + 5 V.
The internal structure can be divided into three parts:
The first part is the charge pump circuit. Consists of 1, 2, 3, 4, 5, 6 feet and 4 capacitors. The function is to generate + 12 V and-12 V two power supplies, to the RS-232 serial port level needs.
The second part is the data conversion channel. The data tunnel consists of seven, 8, 9, 10, 11, 12, 13, and 14.
Among them, 13 feet (R1IN), 12 feet (R1OUT), 11 feet (T1IN), and 14 feet (T1OUT) are the first data channel.
Eight (R2IN), nine (R2OUT), ten (T2IN), and seven (T2OUT) are the second data channel.
TTL/CMOS Data from T1IN, T2IN input into RS-232 data from T1OUT, T2OUT to the computer DP9 plug; the RS-232 data of DP9 plug is output from R1IN, R2IN input to TTL/CMOS Data and then from R1OUT, R2OUT.
The third part is power supply. 15 DNG and 16 VCC (+ 5 v ). See the following figure. Maxcompute pin chart
General description: maxcompute is a dual-channel TTL level to RS232 level converter, commonly used in the serial port connection of electronic devices. To put it bluntly, the 5 v ttl signal from a general chip is converted into a 15 V RS232 signal.Main features
1. Single 5 V power supply
2. LinBiCMOSTM Technology
3. Two drives and two receivers
4. ± 30V input level
5. Low Power supply current: the typical value is 8mA.
6. meets or even better than ANSI standard EIA/TIA-232-E and ITU Recommendation standards V.28
7. ESD protection greater than 3015 V of the MIL-STD-883 (Method 2000) Standard
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