L6256 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6256' PDF : 28 Pages View PDF
L6256
Spindle Logic Interface Specifications
The digital interface to the controller chip has the following specifications:
Parameter
SP_CLK, Voh
SP_CLK, Vol
EMF_Det Vit+
EMF_Det Vit-
EMF_Det Hysteresis
EMF_Det Iil
EMF_Det Iih
EMF_Det Load
Min.
VCC-0.8
0.7 VCC
0.1VCC
Max.
0.5
0.2Vcc
0.3VCC
-1
1
30pF, 1.6mA
Units
V
V
V
V
V
µA
µA
The SP_CLK is a CMOS output. The EMF_Det input is a schimitt trigger with the specified thresholds
and leakage currents.
Vpwr Blocking Diode
The blocking diode in the Vpwr line is optionally a non-schottky part. If this occurs, schottkys should be
used in the charge pump to provide the proper voltage at minimum supply. If regular diodes are used in
both places, the part is functional (at 10% increased Rdson in all drivers) at the lowered Vpwr voltage.
Figure 9a. Run Mode Spindle Voltage Waveforms
Figure 9b. Start Mode Spindle Voltage Waveforms
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