11.1.3 Power Supplies and Reference
The layout for the BQ79606A-Q1 power supplies and references must be done properly to minimize noise.
- REF1 (pin 46): This is High-Power Reference Bypass Connection. Make sure to connect the cap as close as possible to the REF1 and AVSS pin 45 and the trace is noise free.
- TSREF (pin 43): Bias Voltage for temperature sensing (NTC) Monitor. The decoupling capacitor must be placed as close as possible to the pin. Leave TSREF unconnected if the NTC monitoring is not used.
- DVDD (pin 36): This is a digital 1.8V regulator. The decoupling capacitor must be placed as close as possible to the pin and make the trace noise free as possible.
- CVDD (pin 25): This is Daisy Chain Communication Power. The decoupling capacitor must be placed as close as possible to the pin and make the trace noise free as possible.
- AVDD (pin 44): This is 5-V Regulator Output. The decoupling capacitor must be placed as close as possible to the pin and make the trace noise free as possible.
- VLDO (pin 39): This is a 5-V Regulator Output. VLDO supplies CVDD. Bypass VLDO to AVSS with ceramic capacitor of typical value of 2.2μF and place it as close as possible to the pin.