L99UDL01 datasheet(63/88 Pages) STMICROELECTRONICS

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DS12511 Rev 5

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L99UDL01

Programmers guide

GRPx_y

These bits assign outputs to one of two groups for the purpose of paralleling. When

grouped, the outputs behave as one.

There are two groups that can associate outputs together. Group 1 can only associate

outputs 1 through 3. Group 2 can only associate outputs 4 through 6. Group 1 must have

Output 1 in the group. Also, group 2 must have Output 4 in the group.

Configuring these bits alters how the current regulation/PWM bits are used. In PWM control

(C_PWM_SWx = 1), only the master is used to configure outputs associated together.

Master outputs are output 1 for outputs 1 through 3 and output 4 for outputs 4 through 6. All

C_PWM_SWx bits in the associated group must be at the same setting.

When in current regulation control, all outputs in the group are configured. All currents are

added to give a total regulated current value. See Section 2.4.9 as well as Control registers

04H and 05H for more detail.

Any unassociated outputs are driven or configured normally.

DITHN

This bit disables the dither frequency to the charge pump oscillator. Disabling the dither

function will stop the charge pump oscillator from constantly shifting in frequency within a

specified range of frequencies.

GRP2_6

Group 2 assignment bit for Output 6

GRP2_5

Group 2 assignment bit for Output 5

GRP1_3

Group 1 assignment bit for Output 3

GRP1_2

Group 1 assignment bit for Output 2

0Parity

Table 37. Grouping configuration bits

Group configuration

GRP2_6

GRP2_5

GRP1_3

GRP1_2

Group assignments

000

No group

Group 1, 2

Group 1, 3

Group 1, 2, 3

Group 4, 5

Group 4, 6

Group 4, 5, 6

Table 36. 03H register bit description (continued)

Bit#

Command

Description

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