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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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BQ79600-Q1 Datenblatt(PDF) 20 Page - Texas Instruments |
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BQ79600-Q1 Datenblatt(HTML) 20 Page - Texas Instruments |
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20 / 71 page  SCLK nCS MOSI MISO SPI_RDY SPI_RDY high indicates host can read/write predefined number of bytes MSB_n LSB_n tSPI_CLKH tSPI_CLKL tSU tH t9 t10 t11 t12 t13 t14 tSPI_CLK t>0 MSB_n+1 MSB_n LSB_n tH Bit 7 Bit 0 MSB LSB One Byte Bit 0 bit period = t SPI_CLK Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 7 xxx xxx xxxx xxxx Hi or Low Hi or Low SPI_RDY may go low (and it is ok) before finish read/write this batch Figure 7-13. SPI Timing and Byte Definition Note Although SPI interface is full duplex at physical layer, at frame layer, it is effectively half duplex because daisy chain only supports half duplex. It means, at the given time, only a command frame OR a response frame is transmitted between MCU and the device. • When command is being sent from MCU to the device, BQ79600 TX FIFO (2 buffers) should be empty, 0xFF is sent to MCU (except in FIFO diagnostic mode) • When response is being sent from device to MCU, MCU shall clock in 0xFF • Host shall provide SPI clock in the range between 2MHz and 6MHz. This range is set by the predefined size of FIFO. Even SPI can run at 6MHz, it does not increase the throughput of total system as daisy chain speed still limit the throughput. • To avoid collisions on the daisy chain interface, the MCU must wait until all expected response frames are received (or waiting timer expires) before sending another command frame to bq79600. Refer to flow chart in Figure 7-16. • Master shall always drive MOSI to ‘1’ when not sending command frame into device. • Host Read mode: from host perspective, read mode is between first byte of a valid read command and last expected number of byte received. • Device Read mode: start from first byte of a valid read command, device exists read mode when TX FIFO times out and FIFO is empty. Device read mode is subset of host read mode. (concept used for understanding of communication fault registers 0x2301, 0x2302) • Other than Comm Clear, device rejects any data from MOSI before exiting Device Read mode. • SPI module rejects any data from daisy chain (stack device) or from itself after TX FIFO timeout List item. until it enters Device Read mode again. BQ79600-Q1 SLUSDS1A – NOVEMBER 2019 – REVISED AUGUST 2020 www.ti.com 20 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: BQ79600-Q1 |
Ähnliche Teilenummer - BQ79600-Q1_V01 |
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Ähnliche Beschreibung - BQ79600-Q1_V01 |
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