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6.2.38 BB_IPK

Offset

Bit Position

0x4F

Reset

0x00

Access

Name

Table 6.38. BB_IPK

Bit

Name

Reset

Access

Description

7:5

BB_IPK_EM2

0x00

read-write

Peak Current setting for DCDC A in EM2.

Note that unlike DCDC B, there is only a single Coulomb

counter for DCDC A that is used in both EM0 and EM2

modes. Therefore, if Coulomb counting is used with DCDC

A, BB_IPK_EM2 must be set such that the peak current in

EM2 is the same as the peak current in EM0 to ensure the

charge per pulse is the same in both energy modes.

Roughly equivalent peak currents in EM2 and EM0 can be

achieved by setting BB_IPK_EM2 = ( BB_IPK - 2 ) / 4.

The BB_IPK_EM2 setting is used differently depending on

the operating mode of the DCDC A converter, but the re-

sulting peak currents for all modes are derived from the

following base peak current equation:

IPK_BASE = 0.090A + ( 0.009A * ( (4 * BB_IPK_EM2 ) +

2) )

Although the IPK_BASE equation differs between EM2

and EM0, the equations that govern the resulting peak cur-

rent for each operating mode are the same as documen-

ted in the BB_IPK description.

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