STMicroelectronics Stepper motor driver mounting the L6474 in high power PowerSO package EVAL6474PD EVAL6474PD Hoja De Datos
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EVAL6474PD
Programming manual
L6474
42/52
Doc ID 022529 Rev 3
The TQREG bit sets if the torque regulation (see
) is performed through the
ADCIN voltage (external) or TVAL register (internal):
The TOFF time is used by current control system. If its value is lower than the TOFF_MIN
one, the OFF time is equal to TOFF_MIN.
one, the OFF time is equal to TOFF_MIN.
Any attempt to write the CONFIG register when the outputs are enabled causes the
command to be ignored and the NOTPERF_CMD flag to rise (see
command to be ignored and the NOTPERF_CMD flag to rise (see
9.1.13 STATUS
When HiZ flag is high, it indicates that the bridges are in high impedance state. Enable
command makes the device exit from High Z state unless error flags forcing a High Z state
are active.
command makes the device exit from High Z state unless error flags forcing a High Z state
are active.
Table 25.
Programmable power bridge output slew-rate values
POW_SR [1..0]
Output Slew-rate (1) [V/
μs]
(1)
1.
See SRout_r and SRout_f parameters in the electrical characteristics
for details.
0 0
320
0 1
75
1 0
110
1 1
260
Table 26.
External torque regulation enable
TQREG
External torque regulation enable
0 Internal
registers
1 ADC
input
Table 27.
OFF time
TOFF [4..0]
OFF time
0 0 0 0 0
4
µs
0 0 0 0 1
4
µs
0 0 0 1 0
8
µs
…
…
…
…
…
…
1 1 1 1 1
124
µs
Table 28.
STATUS register
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
1
1
1 OCD
TH_SD
TH_WRN
UVLO
WRONG_CMD
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
NOTPERF_CMD 0
0
DIR
0
0
1
HiZ