AMIS-30624_13 Datasheet, PDF (28/52 Pages) ON Semiconductor – I2C Micro-stepping Motor Driver

AMIS−30624, NCV70624
Table 19. RAM REGISTERS
Register
Length
Mnemonic (bit)
Related Commands
Comment
Reset
State
Actual position
ActPos
16 GetFullStatus2
GotoSecurePos
ResetPosition
16−bit signed
Last programmed
Position
Pos/TagPos
16/11
GetFullStatus2
GotoSecurePos
ResetPosition
SetPosition
16−bit signed or
11−bit signed for half stepping
(see Positioning)
Acceleration shape
AccShape
1 GetFullStatus1
SetMotorParam
ResetToDefault
‘0’  normal acceleration from Vmin to Vmax
‘0’
‘1’  motion at Vmin without acceleration
Coil peak current
Irun
4 GetFullStatus1
Operating current
SetMotorParam
See look−up table Irun
ResetToDefault
Coil hold current
Ihold
4 GetFullStatus1
SetMotorParam
ResetToDefault
Standstill current
See look−up table Ihold
Minimum Velocity
Vmin
4 GetFullStatus1
SetMotorParam
ResetToDefault
See Section Minimum Velocity
See look−up table Vmin
Maximum Velocity
Vmax
4 GetFullStatus1
SetMotorParam
ResetToDefault
See Section Maximum Velocity
See look−up table Vmax
Shaft
Acceleration/
deceleration
Shaft
Acc
1 GetFullStatus1
SetMotorParam
ResetToDefault
4 GetFullStatus1
SetMotorParam
ResetToDefault
Direction of movement
See Section Acceleration
See look−up table Acc
From
OTP
memory
Secure Position
SecPos
11 GetFullStatus2
SetMotorParam
ResetToDefault
Target position when HW connection fails; 11
MSB’s of 16−bit position (LSB’s fixed to ‘0’)
Stepping mode
StepMode
2 GetFullStatus1
SetStallParam
ResetToDefault
See Section Stepping Modes
See look−up table StepMode
Stall detection
absolute threshold
AbsThr
4 GetFullStatus1
SetStallParam
ResetToDefault
Stall detection delta
threshold
DelThr
4 GetFullStatus1
SetStallParam
ResetToDefault
Stall detection delay FS2StallEn
3 GetFullStatus2
SetStallParam
Delays the stall detection after acceleration
‘000’
Stall detection
sampling
MinSamples
3
GetFullStatus2
SetStallParam
Duration of the zero current step in number
of PWM cycles.
‘000’
PWM Jitter
PWMJEn
1 GetFullStatus2
‘1’ means jitter is added
‘0’
SetStallParam
100% duty cycle
DC100StEn
1 GetFullStatus2
‘1’ means stall detection is enabled in case
‘0’
Stall Enable
SetStallParam
PWM regulator runs at d = 100%
PWM frequency
PWMFreq
1 SetMotorParam
‘0’ means ~ 22 KHz,
‘0’
‘1’ means ~ 44 KHz
30. A ResetToDefault command will act as a reset of the RAM content, except for ActPos and TagPos, which are registers that are not
modified. Therefore, the application should not send a ResetToDefault during a motion, to avoid any unwanted change of parameter.
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