PCN-TOPAZ-J

Owned by Martin Welford
Nov 24, 2020

Number: PCN-TOPAZ-J

Issue Date: 25 Nov 2020

Implementation Date: TBD

Samples: email support@devicesolutions.net 

Description: 

This revision updates the power management functions on Topaz.  This is a change from the NXP MC3704 part to a TI 65051.

Reason for change:

The NXP power management IC (PMIC) used on Topaz has been discontinued.  

Customer action required: Potential hardware design impact

Changes to the Topaz interface and functionality have been kept to a minimum with this update, however, customers should check 2 areas of their base-board design:

  1. Use of 3V3 power from Topaz
  2. Use of unique NXP MC3704 signals

3.3V Power 

The MC34704 incorporated two 3.3V rails, labeled 3V3_Reg2 and 3V3_Reg5. 

The TI PMIC also has 2 3.3V rails, but the configuration is different.  Key differences are:

  1. This rail is no longer switchable and is ON when Topaz starts where it was previously OFF.
  2. Capacity has been reduced from 500mA to 400mA
  3. The regulator has changed from a switcher to an LDO

If any of these changes will have an impact on your design, contact support@devicesolutions.net. 


MC34704 Signals

The following signals/functionality are not supported (and not connected) on the new design:

  • ON/OFF
  • PSU_LION. There is no longer any battery support.
  • VLED.  There is no support for the boost and buck/boosts rails for LCDs.
  • I2C.  The NXP PMIC was controllable via I2C, but the new PMIC does not have this capability.



Contact support@devicesolutions.net for any further information.