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BQ7693003DBT Datasheet(PDF) 30 Page - Texas Instruments |
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BQ7693003DBT Datasheet(HTML) 30 Page - Texas Instruments |
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30 / 63 page  A6 A5 A0 ... R7 R/W R6 R0 ... D0 ... C7 C6 C0 ... Start Slave Address Register Address Stop SCL SDA A6 A5 A0 ... R/W ACK ACK ACK D7 D6 ACK NACK Slave Address Slave Drives CRC (optional) Master Drives NACK Slave Drives Data Stop Start bq76920, bq76930, bq76940 SLUSBK2F – OCTOBER 2013 – REVISED NOVEMBER 2015 www.ti.com • In a block read transaction, the CRC for the first data byte is calculated after the second start and uses the slave address and data byte. The CRC for subsequent data bytes is calculated over the data byte only. The CRC polynomial is x8 + x2 + x + 1, and the initial value is 0. When the master detects a bad CRC, the I2C master will NACK the CRC, which causes the I2C slave to go to an idle state. Figure 7-6. I2C Read Without Repeated Start 7.4 Device Functional Modes Each bq769x0 device supports the following modes of operation. Table 7-2. Supported Power Modes Mode Description Fully operational state. Both ADC and CC may be on, or disabled by host microcontroller. OV and UV protection enabled if ADC is on. OCD and SCD enabled. ADC and CC may be NORMAL disabled to reduce power consumption, and CC may be operated in a “1-SHOT” mode for flexible power savings. Lowest possible power state, intended for pack assembly and/or long term pack storage. SHIP Must see a BOOT signal (> 1 VBOOT) on TS1 pin to boot from SHIP → NORMAL. Note that the device always enters SHIP mode upon POR. 7.4.1 NORMAL Mode NORMAL mode represents the fully operational mode where all blocks are enabled and the device sees its highest current consumption. In this mode, certain blocks/functions may be disabled to save power—these include the ADC and CC. OV and UV are running continuously as long as the ADC is enabled. The OCD and SCD comparators may not be disabled in this mode. Transitioning from NORMAL to SHIP mode is also initiated by the host, and requires consecutive writes to two bits in the SYS_CTRL1 register. 7.4.2 SHIP Mode SHIP mode is the basic and lowest power mode that bq769x0 supports. SHIP mode is automatically entered during initial pack assembly and after every POR event. When the device is in NORMAL mode, it may enter SHIP by the host controller via a specific sequence of I2C commands. In SHIP mode, only a minimum of blocks are turned on, including the VSTUP power supply and primal boot detector. Waking from SHIP mode to NORMAL mode requires pulling the TS1 pin greater than VBOOT, which triggers the device boot-up sequence. 30 Detailed Description Copyright © 2013–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: bq76920 bq76930 bq76940 |
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