L7250
PIN DESCRIPTION (continued)
N°
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
Pin
25_BASE
25_FEED
33_BASE
33_FEED
CPOR
V
O5
I5
Description
Reg 1.8V ext NPN base
Reg 1.8V feedback
O5
IO5
IO5
O5
IO5
gnd
IO5
O5
I5
Reg 3.3V ext NPN base
Reg 3.3 V feedback
POR delay capacitor
POR output signal
NPOR
CBRAKE
AGND
Spindle brake capacitor
analog gnd
VREF25
ZC
2.5V reference
Spindle zero crossing
Shock sensor input
Skin
Skout
O5
I5
Shock sensor 1st opamp output
Shock sensor filter input
Shock sensor filter output
Shock sensor output
Timer 1 for unload procedure
VCM BEMF coarse calibration
auxiliary input for the ADC
VCM BEMF processor output
used for testing porpouse (*)
Serial enable
SkFin
SkFout
SkDout
Timer1
O5
O5
IO5
I5
CalCoarse
ADaux
I5
VCMBEMF
Test
O5
IO5
I5
SEN
SDATA
IO5
I5
Serial data
SYSClk
SCLK
System clock
I5
Serial clock
DAC_OUT
ERR_IN
ERR_OUT
SNS_OUT
SNS_P
SNS_N
VCMGND3
O5
I5
VCM DAC output
VCM error opamp input
VCM error opamp output
VCM sense opamp output
VCM sense opamp positive input
VCM sense opamp negative input
VCM power ground
O5
O5
I12
I12
gnd
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STMICROELECTRONICS [ ST ]
