STMicroelectronics Stepper motor driver mounting the L6474 in high power PowerSO package EVAL6474PD EVAL6474PD Hoja De Datos
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EVAL6474PD
L6474
Programming manual
Doc ID 022529 Rev 3
41/52
The OSC_SEL and EXT_CLK bits set the system clock source:
The OC_SD bit sets whether or not an overcurrent event causes the bridges to turn off; the
OCD flag in the status register is forced low anyway:
OCD flag in the status register is forced low anyway:
The POW_SR bits set the slew rate value of power bridge output:
Table 23.
Oscillator management
EXT_CLK OSC_SEL[2..0]
Clock source
OSCIN
OSCOUT
0
0 0 0
Internal oscillator: 16 MHz
Unused
Unused
0
0 0 1
0
0 1 0
0
0 1 1
1
0
0
0
Internal oscillator: 16 MHz
Unused
Supplies a 2 MHz
clock
1
0
0
1
Internal oscillator: 16 MHz
Unused
Supplies a 4 MHz
clock
1
0
1
0
Internal oscillator: 16 MHz
Unused
Supplies a 8 MHz
clock
1
0
1
1
Internal oscillator: 16 MHz
Unused
Supplies a 16 MHz
clock
0
1
0
0
External crystal or resonator: 8 MHz
Crystal/resonator driving
Crystal/resonator
driving
0
1 0 1
External crystal or resonator: 16
MHz
Crystal/resonator driving
Crystal/resonator
driving
0
1 1 0
External crystal or resonator: 24
MHz
Crystal/resonator driving
Crystal/resonator
driving
0
1 1 1
External crystal or resonator: 32
MHz
Crystal/resonator driving
Crystal/resonator
driving
1
1 0 0
Ext. clock source: 8 MHz
(Crystal/resonator driver disabled)
Clock source
Supplies inverted
OSCIN signal
1
1 0 1
Ext. clock source: 16 MHz
(Crystal/resonator driver disabled)
Clock source
Supplies inverted
OSCIN signal
1
1 1 0
Ext. clock source: 24 MHz
(Crystal/resonator driver disabled)
Clock source
Supplies inverted
OSCIN signal
1
1 1 1
Ext. clock source: 32 MHz
(Crystal/resonator driver disabled)
Clock source
Supplies inverted
OSCIN signal
Table 24.
Overcurrent event
OC_SD Overcurrent
event
1
Bridges shut down
0
Bridges do not shut down