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參數資料
型號: L9942XP1TR
廠商: STMICROELECTRONICS
元件分類: 運動控制電子
英文描述: STEPPER MOTOR CONTROLLER, 2.5 A, PDSO24
封裝: ROHS COMPLIANT, SSOP-24
文件頁數: 11/40頁
文件大小: 639K
代理商: L9942XP1TR
L9942
Electrical specifications
Doc ID 11778 Rev 6
Note:
Current profile has to pre set with I4 I3 I2 I1 I0 = 11111 and load to register 1.
Output current limit IQxnLIM is product of full scale current |IQxnFS_ | (bits DC2 DC1 DC0) and
value of DAC Phase A/B (bits I4 I3 I2 I1 I0) in register1.
Values of DAC Phase A and B can read out and depends on set up done before:
1.
direction DIR, stepping mode ST1 ST0 and phase counter P4 P3 P2 P1 P0 in register 0 and
2.
value of corresponding current profile (for address of current profile entry see also
Figure 7.
Logic to set load current limit
Register 0
UP/Down
STEP
I4
I3
I2
I1
I0
Count by
1,2,4,8
A0
A1
A2
A3
MUX
A0
A1
A2
0
0 1 23 01 2 3 0 1 2 3
Current-Profile Table
stored in register2, ...6
A3=0
Adr
A[3..0]
Phase A
Profile 8
Address Calculation
I4
I3
I2
I1
I0
Profile 7
I4
I3
I2
I1
I0
Profile 6
I4
I3
I2
I1
I0
Profile 5
I4
I3
I2
I1
I0
Profile 4
I4
I3
I2
I1
I0
Profile 3
I4
I3
I2
I1
I0
Profile 2
I4
I3
I2
I1
I0
Profile 1
I4
I3
I2
I1
I0
Profile 0
5
A3=1
Adr
neg(A[3..0])
A3=0
Adr
neg(A[3..0])
Phase B
A3=1
Adr A[3..0]
Register 1
9
5
DIR
P0
P1
P2
P3
P4
PhaseCounter
StepMode
SR0
SR1
ST1 ST0
Slew Rate
DM2
DM1
DM0
MUX
I0
I1
I2
I3
I4
I0
I1
I2
I3
I4
DAC Phase B
DAC Phase A
Decay Mode
5 bit DAC
Phase A
5 bit DAC
Phase B
DC0
DC1
DC2
DAC Scale
DAC
Full Scale
REF
I
MAX
I
LIMIT B
LIMIT A
I
DI
QB1
QB2
QA1
QA2
Qx1LIM
I
Qx2LIM
I
QA1LIM
I
1000
QB2LIM
I
1000
QB1LIM
I
1000
QA2LIM
I
1000
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