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数据搜索系统，热门电子元器件搜索 |
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MAX17823BGCV 数据表(PDF) 48 Page - Maxim Integrated Products |
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MAX17823BGCV 数据表(HTML) 48 Page - Maxim Integrated Products |
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48 / 121 page  ________________________________________________________________________________________________________________________________________________________________ MAX17823B 12-Channel High-Voltage Data Acquisition System www.maximintegrated.com Maxim Integrated | 48 Stop Character The stop character is a framing character that signals the end of a command packet. It is transmitted as an un-encoded 54h with a logic one parity bit and a balanced duty-cycle. S 0 1 0 0 1 0 1 0 E=1 P P Optional Idle Optional Idle Idle Disable Idle Enable Figure 30. Stop Character UART Idle Mode In the low-Z (default) idle mode, the transmitter outputs are both driven to 0V as shown in Figure 31. 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 sending 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 TXP pin must be pulled high (logic one) prior to signaling the start bit (logic zero) as shown in Figure 31. The duration of the logic one is minimized to maintain a balanced duty-cycle while still meeting the timing specification. When transitioning from the stop bit back to idle mode, the delay, if any, is also minimized. TXnP TXnN Idle Idle Preamble tSTSU TXnP-TXnN Figure 31. Communication Mode Data Types The Battery-Management UART Protocol employs several different data types as described in Table 21. Table 21. Data Types |
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