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6.2.48 BK_CTRL2

Offset

Bit Position

0x59

Reset

0x00

Access

Name

Table 6.48. BK_CTRL2

Bit

Name

Reset

Access

Description

RESERVED

Reserved. Always write bits to 0.

6:4

BK_LDO_THRESH

0x00

read-write

Sets threshold for switching DCDC B to LDO B,

DV=VDDB-VOB for buck/LDO boundary is:

(DV_rising ? 25mV : 0) +105mV

+87.5mV*BK_LDO_THRESH

3:0

BK_IRI_CON

0x00

read-write

Controls inrush current for DCDC B by forcing a minimum

time between pulse events (i.e. Tsw, the switching period).

Inrush current limiting may be needed for operation with

batteries that have a large internal impedance and/or limi-

ted output current.

If BK_IRI_CON>0, the minimum switching period (Tsw) is

determined by the following equation:

Tsw (ns) = 300ns * ( 2 * BK_IRI_CON + 1 )

If BK_IRI_CON==0, there is no bound on the switching pe-

riod.

The resulting battery current can be calculated as: (L *

Ipk^2) / (2 * (VDDB - VOB) * Tsw ). To maintain a constant

current limit over the battery voltage range, firmware

should occasionally read the battery voltage and recalcu-

late the BK_IRI_CON value.

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