TMC8462 Datasheet • Document Revision V1.4 • 2018-May -09
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tBBM
Brake Before Make time tBBM with
Individually programmable
for high side and low side
due to different timing
tBBM_H = BBM_H ∗ tCLK
tBBM_L = BBM_L ∗ tCLK
requirements,
especially
when using PMOS @ High
Side and NMOS @ Low Side
Table 204: PWM unit parameters
PWM_MAXCNT Configuration This configuration can be found in the PWM_CFG register. It defines the
number of counts per PWM cycle for three PWM units. This determines the length tP W M of each PWM
cycle respectively the PWM frequency fP W M . It is programmable for adjustment of the PWM frequency
fP W M
.
PWM_CHOPMODE Configuration This configuration can be found in the PWM_CFG register. It selects
the chopper mode of the 4 PWM channels. Each channel can be configured individually. The following
table gives the available chopper modes.
Selection Chopper High Side Low Side Function
000
001
010
011
100
101
110
111
no
off
off
no chopper, all off
no
off
on
no chopper, LS permanent on
no chopper, HS permanent on
no chopper, all off, not used
no chopper, all off, not used
chopper LS, HS off
no
no
off
no
off
off
no
off
off
yes
yes
Yes
off
PWM
Off
PWM
PWM
chopper HS, LS off
not PWM chopper HS and LS complementary, brake-before-make
is handled by programmable BBM unit
Table 205: PWM modes
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