EVAL6470H Datasheet, PDF (28/70 Pages) STMicroelectronics – dSPIN fully integrated microstepping motor driver with motion engine and SPI

Functional description
L6470
must be placed as close as possible to the pins. Refer to Table 8 for the choice of load
capacitor values according to the external oscillator frequency.
Table 8. CL values according to external oscillator frequency
Crystal/resonator freq. ⁽¹⁾
C_L ⁽²⁾
8 MHz
16 MHz
24 MHz
32 MHz
25 pF (ESR_max = 80 Ω)
18 pF (ESR_max = 50 Ω)
15 pF (ESR_max = 40 Ω)
10 pF (ESR_max = 40 Ω)
1. First harmonic resonance frequency.
2. Lower ESR value allows the driving of greater load capacitors.
If a direct clock source is used, it must be connected to the OSCIN pin and the OSCOUT pin
supplies the inverted OSCIN signal (see Figure 12).
Figure 12. OSCIN and OSCOUT pin configuration
%84?#,+
#,
#,
-(Z
%84?#,+
-(Z
/3#?3%,XX
/3#).
/3#/54
%XTERNALOSCILLATOR
CONFIGURATION
/3#).
/3#/54
%XTERNALCLOCKSOURCE
CONFIGURATION
-(Z
Note:
6.9
/3#?3%,XX
5.53%$
5.53%$
/3#).
/3#/54
)NTERNALOSCILLATOR
CONFIGURATION
WITHOUTCLOCKSOURCE
When OSCIN is UNUSED, it should be left floating.
When OSCOUT is UNUSED, it should be left floating.
5.53%$
/3#).
/3#/54
)NTERNALOSCILLATOR
CONFIGURATION
WITHCLOCKGENERATION
!-V
Overcurrent detection
When the current in any of the Power MOSFETs exceeds a programmed overcurrent
threshold, the STATUS register OCD flag is forced low until the overcurrent event has
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Doc ID16737 Rev 5