WM8351 datasheet(114/330 Pages) WOLFSON

114 / 330 page

WM8351

Production Data

PD, April 2012, Rev 4.5

114

The configuration bits include:



Duration control bits for the /RST reset signal (RSTB_TO)



GPIO pull-up / pull-down settings and debounce times (GPn_PD, GPn_PU, GPn_DB and

GP_DBTIME)



Alternate function and input/output selection for GPIO pins (GPn_FN, GPn_DIR and GPn_CFG)



Voltage settings for DC-DC converters and LDO regulators (DCn_VSEL and LDOn_VSEL)



Time slots for automatic start of all DC-DC converters, all LDO regulators and the Current Limit

Switch during startup (DCn_ENSLOT, LDOn_ENSLOT and LS_ENSLOT). Note that supplies

can be programmed to not start up automatically by setting the respective _ENSLOT bits to

0000.

Typically, the final step in the sequence is a write to register R6, in order to:



Select the WM8351 device address on the primary control interface, using the DEV_ADDR bits.



Allow the WM8351 to proceed to startup. This is achieved by setting the CONFIG_DONE bit (R6

bit 12) to 1.



Switch the control interface back to the primary interface (if desired), so that a host processor

can communicate with the WM8351. This is achieved by setting USE_DEV_PINS (R6 bit 15) to

WM8351 Datasheet(PDF) 114 Page - Wolfson Microelectronics plc