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BD8256EFV-ME2 Fiches technique(PDF) 21 Page - Rohm

No de pièce BD8256EFV-ME2
Description  9ch System Motor Driver For Car AV
Download  53 Pages
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Fabricant  ROHM [Rohm]
Site Internet  http://www.rohm.com
Logo ROHM - Rohm

BD8256EFV-ME2 Fiches technique(HTML) 21 Page - Rohm

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TSZ02201-0G1G0BK00030-1-2
© 2013 ROHM Co., Ltd. All rights reserved.
4.Apr.2016 Rev.004
www.rohm.com
TSZ22111・15・001
BD8256EFV-M
◆ Spindle (SP)
Suppose that IO PEAK represents peak output current, IO PEAK can be expressed in the following ways.
IO PEAK = 0
( | VDAC | < VDZSP )
IO PEAK = gmSP × | VDAC |
( gmSP × | VDAC | < ILIMSP )
IO PEAK = ILIMSP
( gmSP × | VDAC | > ILIMSP )
Where VDZSP is input deadzone (single-sided) of 10mV (Typ). The gmSP is output/input gain and ILIMSP is output limit current,
and they can be obtained respectively as follows.
gmSP = 0.409 / RSPRNF [A/V]
ILIMSP = 0.35 / RSPRNF [A]
VDAC, the DAC output voltage, can be obtained from DAC register settings through the following equation.
MSB=0 :
VDAC = 1.0×(bit[10]×0.5
1+bit[9]×0.52+bit[8]×0.53+…+bit[0]×0.511)
MSB=1 :
VDAC = (-1.0)×(^bit[10]×0.5
1+^bit[9]×0.52+^bit[8]×0.53+…+^bit[0]×0.511+0.511)
DAC format (DSP)
REG
MSB
Digital input (BIN)
LSB
Hex
Dec
VDAC [V]
IO PEAK [A]※
08h(DSP)
1000_0000_0000
800h
-2048
-0.9995
-1.239
1000_0000_0001
801h
-2047
-0.9995
-1.239
1111_1110_1011
FEBh
-21
-0.0103
-0.013
1111_1110_1100
FECh
-20
-0.0098
0
1111_1111_1111
FFFh
-1
-0.0005
0
0000_0000_0000
000h
0
0
0
0000_0000_0001
001h
+1
+0.0005
0
0000_0001_0100
014h
+20
+0.0098
0
0000_0001_0101
015h
+21
+0.0103
+0.013
0111_1111_1110
7FEh
+2046
+0.9990
+1.238
0111_1111_1111
7FFh
+2047
+0.9995
+1.239
*Output voltage saturation and limit current setting are not taken into account in the table. Condition:RSPRNF=0.33Ω
-1.06
-1.239
1.24 A/V
=gmSP(Input-output Gain)
800h
FECh
DAC code
0
014h
-0.9995
=VDZSP(Input Deadzone)
7FFh
+/- 10mV
IO PEAK [A]
VDAC [V]
+1.239
+0.9995
+1.06
=ILIMSP(Limit Current)
Figure 13. IO PEAK Characteristics (When set as RSPRNF=0.33 Ω).


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