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BQ27426YZFR Datasheet(PDF) 10 Page - Texas Instruments |
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BQ27426YZFR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 25 page Host generated A A S 0 ADDR[6:0] CMD [7:0] Sr 1 ADDR[6:0] A DATA [7:0] A DATA [7:0] P N . . . (d) incremental read A A S 0 ADDR[6:0] CMD [7:0] Sr 1 ADDR[6:0] A DATA [7:0] P N (c) 1- byte read A A S A 0 P ADDR[6:0] CMD [7:0] DATA [7:0] (a) 1-byte write (b) quick read S 1 ADDR[6:0] A DATA [7:0] P N Gauge generated . . . A A S A 0 P ADDR[6:0] CMD[7:0] DATA [7:0] DATA [7:0] A A (e) incremental write (S = Start , Sr = Repeated Start , A = Acknowledge , N = No Acknowledge , and P = Stop). 10 bq27426 SLUSC91C – OCTOBER 2015 – REVISED FEBRUARY 2016 www.ti.com Product Folder Links: bq27426 Submit Documentation Feedback Copyright © 2015–2016, Texas Instruments Incorporated Feature Description (continued) 7.3.1 Communications 7.3.1.1 I2C Interface The fuel gauge supports the standard I2C read, incremental read, quick read, one-byte write, and incremental write functions. The 7-bit device address (ADDR) is the most significant 7 bits of the hex address and is fixed as 1010101. The first 8 bits of the I2C protocol are, therefore, 0xAA or 0xAB for write or read, respectively. Figure 6. I2C Interface The quick read returns data at the address indicated by the address pointer. The address pointer, a register internal to the I2C communication engine, increments whenever data is acknowledged by the fuel gauge or the I2C master. “Quick writes” function in the same manner and are a convenient means of sending multiple bytes to consecutive command locations (such as two-byte commands that require two bytes of data). The following command sequences are not supported: Figure 7. Attempt To Write a Read-only Address (Nack After Data Sent By Master) Figure 8. Attempt To Read an Address Above 0x6B (Nack Command): 7.3.1.2 I2C Time Out The I2C engine releases both SDA and SCL if the I2C bus is held low for 2 seconds. If the fuel gauge is holding the lines, releasing them frees them for the master to drive the lines. If an external condition is holding either of the lines low, the I2C engine enters the low-power SLEEP mode. |
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