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AM4376 Datasheet(PDF) 232 Page - Texas Instruments |
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AM4376 Datasheet(HTML) 232 Page - Texas Instruments |
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232 / 261 page  HDQ t CYCD t DW0 t DW1 HDQ t HW0 t CYCH t HW1 HDQ t B t BR AM4376, AM4377, AM4378, AM4379 SPRS851B – JUNE 2014 – REVISED APRIL 2015 www.ti.com 5.12.15 HDQ/1-Wire Interface (HDQ/1-Wire) NOTE For more information, see HDQ/1-Wire Interface chapter of the AM437x ARM Cortex-A9 Microprocessors (MPUs) Technical Reference Manual (SPRUHL7). The module is intended to work with both HDQ and 1-Wire protocols. The protocols use one wire to communicate between the master and the slave. The protocols employ an asynchronous return to one mechanism where, after any command, the line is pulled high. 5.12.15.1 HDQ Protocol Table 5-96 and Table 5-97 assume testing over the recommended operating conditions (see Figure 5-112 through Figure 5-115). Table 5-96. HDQ Timing Requirements PARAMETER MIN MAX UNIT tCYCD Bit window 190 μs tHW1 Reads 1 32 66 μs tHW0 Reads 0 70 145 μs tRSPS Command to host respond time(1) 190 320 μs (1) Defined by software Table 5-97. HDQ Switching Characteristics PARAMETER DESCRIPTION MIN MAX UNIT tB Break timing 190 μs tBR Break recovery 40 μs tCYCH Bit window 190 250 μs tDW1 Sends 1 (write) 0.5 50 μs tDW0 Sends 0 (write) 86 145 μs Figure 5-112. HDQ Break (Reset) Timing Figure 5-113. HDQ Read Bit Timing (Data) Figure 5-114. HDQ Write Bit Timing (Command/Address or Data) 232 Specifications Copyright © 2014–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: AM4376 AM4377 AM4378 AM4379 |
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