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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MAX17843 датащи(PDF) 56 Page - Maxim Integrated Products |
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MAX17843 датащи(HTML) 56 Page - Maxim Integrated Products |
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56 / 131 page  Stop Character The stop character is a framing character that signals the end of a command packet. It is transmitted as an unen- coded 54h with a logic-one parity bit and a balanced duty cycle (see Figure 34). UART Idle Mode In the low-Z (default) idle mode, the transmitter outputs are both driven to 0V (see Figure 35). In the high-Z idle mode, the transmitter outputs are not driven by the UART. The MAX17841B interface automatically places its transmitter in idle mode immediately after each command packet and remains in idle mode until either the next command packet is sent or it goes into keep-alive mode, send- ing periodic stop characters to prevent the daisy-chain device(s) from going into shutdown. UART Communication Mode When transitioning from idle mode to communication mode, the TXnP pin must be pulled high (logic-one) prior to signaling the start bit (logic-zero) (see Figure 35). The duration of the logic-one is minimized to maintain a bal- anced duty-cycle while still meeting the timing specifica- tion. When transitioning from the stop bit back to idle mode, the delay, if any, is also minimized. Figure 34. Stop Character Figure 35. Communication Mode S 0 1 0 0 1 0 1 0 E = 1 P P OPTIONAL IDLE OPTIONAL IDLE IDLE DISABLE IDLE ENABLE TXnP TXnN IDLE IDLE PREAMBLE tSTSU TXnP-TXnN MAX17843 12-Channel, High-Voltage Smart Sensor Data-Acquisition Interface www.maximintegrated.com Maxim Integrated │ 56 |
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