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BQ40Z50-R2: Drivers written in C

Gregory Duperon
Expert 7470 points
Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQ40Z50

Are there any drivers written in C to interface with this device?

  • 0
    TI__Guru 52115 points

    What kind of driver are you talking about?  Linux driver? 

  • 0 in reply to Andy Liu (BMS)
    TI__Expert 7470 points

    My customer is looking for the layer above the hardware control to see the logic of reading and writing the various data to the IC.

    They need to support getting the battery percentage.

    Thanks.

  • 0 in reply to Gregory Duperon
    TI__Guru 52115 points

    I don't think we have any C code.  Basically, it is easy to communicate with bq40z50 via SMBus.

    I would suggest your customer take a look at Section 14 SBS commands in the bq40z50 TRM.  They will see some examples there.

    Also,  below is some python code, which shows how to read voltage and temperature measurements from bq40z50. 

    Fullscreen 1732.bq40z50_smb_read_vt.py Download 
    import time
import smbus

DEVICE_BUS  = 1
DEVICE_ADDR = 0x0b

bus = smbus.SMBus(DEVICE_BUS)
        
voltage = bus.read_word_data(DEVICE_ADDR, 0x09)
    
time.sleep(0.05)

temperature_K = bus.read_word_data(DEVICE_ADDR, 0x08)
temperature_C = temperature_K * 1.0 / 10.0 - 273.15

output = "%dmV,%0.3fC" % (voltage, temperature_C)
            
print output