Datasheet

TMC8462 Datasheet • Document Revision V1.5 • 2019-June-21
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t
BBM
Brake Before Make time t
BBM
with
tBBM_H = BBM_H ∗ t
CLK
tBBM_L = BBM_L ∗ t
CLK
Individually programmable
for high side and low side
due to different timing
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 t
P W M
of each PWM
cycle respectively the PWM frequency f
P W M
. It is programmable for adjustment of the PWM frequency
f
P 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 no off off no chopper, all off
001 no off on no chopper, LS permanent on
010 no no off no chopper, HS permanent on
011 no off off no chopper, all off, not used
100 no off off no chopper, all off, not used
101 yes off PWM chopper LS, HS off
110 yes PWM Off chopper HS, LS off
111 Yes PWM not PWM chopper HS and LS complementary, brake-before-make
is handled by programmable BBM unit
Table 205: PWM modes
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