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BQ79600-Q1 데이터시트(PDF) 26 Page - Texas Instruments |
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BQ79600-Q1 데이터시트(HTML) 26 Page - Texas Instruments |
26 / 71 page Table 7-6. Daisy Chain Byte Definition BIT NAME DESCRIPTION Preamble (half-bit) Indicates a start of byte transaction, signaling the receiver to start sampling. This half-bit and the following 2 SYNC bits are used for extra timing information. SYNC[1:0] Always 0b00. The SYNC bits are used for the digital to assess the timing and noise level on the byte, improving the detection of a '1' and '0' in a noisy environment. Start-Of-Frame (1-bit) The Start-Of-Frame (SOF) bit defines the byte as the INIT byte (initialization byte) in the frame, refer to Figure 7-8. Stack device needs this information in order to process the communication. Data[7:0] The actual 8-bit payload. Byte Error BERR (1-bit) For BQ79600-Q1, BERR is always ‘0’ in command frames sent to stack device. While in received response frames, if it is ‘1’, it indicates last device DEBUG_COM*_PHY[PERR] = 1. Postamble (half-bit) Indicates the end of byte transaction. 7.3.2.2 Tone Communication Protocol Other than data, certain information is transmitted using tone: signals to change power state of stack device (SLP2ACT tone, WAKE tone, SHUTDOWN tone, HWRST tone), signals related to faults (FAULT tone and HEARTBEAT tone). The definition of each tone is defined in Figure 7-22 and Figure 7-21. Device can transmit and receive tones in summary below: Table 7-7. Available Tones to BQ79600-Q1 DIRECTION NAME Receive FAULT tone and HEARTBEAT tone Transmit SLP2ACT tone, WAKE tone, SHUTDOWN tone, HWRST tone, HEARTBEAT tone Note: • Device does not transmit Fault Tone as it uses Section 7.3.3.2.1 to signal fault if enabled. • SLP2ACT/WAKE/SHUTDOWN/HWRST tone transmitting is on demand when corresponding bit in register CONTROL1 and CONTROL2 is set. • When bridge device in SHUTDOWN, wakeup bridge device doesn’t change power mode of stack devices. • Receiving threshold value is defined as nHBDET, nFTONEDET in section 6.6. • Transmitting number is predefined by device in Table 7-8. Table 7-8. Transmitting Tones Summary Table SLP2ACT WAKE SHUTDOWN HWRST HEARTBEAT (SLEEP only) N of Couplets Transmitted in Single Burst 30 90 270 810 30 Burst Period NA NA NA NA 400ms BQ79600-Q1 SLUSDS1A – NOVEMBER 2019 – REVISED AUGUST 2020 www.ti.com 26 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: BQ79600-Q1 |
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