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AM2434...ALV 数据表(PDF) 242 Page - Texas Instruments |
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AM2434...ALV 数据表(HTML) 242 Page - Texas Instruments |
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242 / 280 page  7.10.5.18 UART For more details about features and additional description information on the device Universal Asynchronous Receiver Transmitter, see the corresponding subsections within Signal Descriptions and Detailed Description sections. Table 7-143. UART Timing Conditions PARAMETER MIN MAX UNIT INPUT CONDITIONS SRI Input slew rate 0.5 5 V/ns OUTPUT CONDITIONS CL Output load capacitance 1 30(1) pF (1) This value represents an absolute maximum load capacitance. As the UART baud rate increases, it may be necessary to reduce the load capacitance to a value less than this maximum limit to provide enough timing margin for the attached device. The output rise/fall times increase as capacitive load increases, which decreases the time data is valid for the receiver of the attached devices. Therefore, it is important to understand the minimum data valid time required by the attached device at the operating baud rate. Then use the device IBIS models to verify the actual load capacitance on the UART signals does not increase the rise/fall times beyond the point where the minimum data valid time of the attached device is violated. Table 7-144. UART Timing Requirements see Figure 7-114 NO. PARAMETER DESCRIPTION MIN MAX UNIT 1 tw(RXD) Pulse width, receive data bit high or low 0.95U(1) (2) 1.05U(1) (2) ns 2 tw(RXDS) Pulse width, receive start bit low 0.95U(1) (2) ns (1) U = UART baud time in ns = 1/programmed baud rate. (2) This value defines the data valid time, where the input voltage is required to be above VIH or below VIL. Table 7-145. UART Switching Characteristics see Figure 7-114 NO. PARAMETER DESCRIPTION MIN MAX UNIT f(baud) Programmable baud rate for Main Domain UARTs 12 Mbps Programmable baud rate for MCU Domain UARTs 3.7 Mbps 3 tw(TXD) Pulse width, transmit data bit high or low U(1) - 2.2 U(1) + 2.2 ns 4 tw(TXDS) Pulse width, transmit start bit low U(1) - 2.2 ns (1) U = UART baud time in ns = 1/programmed baud rate. UARTi_TXD 4 Start Bit Data Bits 3 UARTi_RXD 2 Data Bits Bit Start 1 V IH V IL UART_TIMING_01_RCVRVIHVIL Figure 7-114. UART Timing Requirements and Switching Characteristics AM2434, AM2432, AM2431 SPRSP65D – APRIL 2021 – REVISED AUGUST 2022 www.ti.com 242 Submit Document Feedback Copyright © 2022 Texas Instruments Incorporated Product Folder Links: AM2434 AM2432 AM2431 |
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