IRMCK201 International Rectifier Corp., IRMCK201 Datasheet - Page 45

• Manufacturer Part Number: IRMCK201
• Description: High Performance Configurable Digital Ac Servo Control Ic
• Manufacturer: International Rectifier Corp.

Field
Name
SpdLpEnb
SpdLpRate
KpSreg
KxSreg
SregLimP
SregLimN
SpdScl
TargetSpd
SpdAccRate
SpdDecRate
Offset
0x3C
0x3D
0x3A
0x3B
0x3E
0x3F
Byte
0x38
0x39
7
Access
(R/W)
W
W
W
W
W
W
W
W
W
W
VelocityControl Write Register Field Definitions
6
Field Description
Speed loop enable: 1 = enable speed loop PI controller. 0 = Reset
Speed loop PI controller.
Speed loop update rate: 0 = disabled, N = update speed loop
immediately before every Nth current loop update.
15-bit velocity loop proportional gain, in fixed point with 5 fractional
bits. Range = 0 - 512.
15-bit velocity loop integral gain, in fixed point with 13 fractional bits.
Range = 0 - 2.
16-bit speed PI controller output positive limit.
16-bit speed PI controller output negative limit (2's complement).
Motor Speed Scale factor.
16383 * (33.333MHz/32) / (Max RPM * Encoder PPR) / 2, which will
result in a Speed value ranging ±16384 corresponding to ± Max
RPM.
Velocity loop speed setpoint in SPEED units, which are determined
by the user via the SpdScl register setting.
Velocity loop acceleration in units of SPEED / Velocity loop execution
or SPEED / (SpdLpRate / PWM period).
Velocity loop deceleration in units of SPEED / Velocity loop execution
or SPEED / (SpdLpRate / PWM period).
VelocityControl Write Register Map
IRMCK201
SregLimN – Velocity loop negative Limit (MSBs)
SregLimN – Velocity loop negative Limit (LSBs)
5
TargetSpd – Setpoint/target speed (MSBs)
TargetSpd – Setpoint/target speed (LSBs)
SpdScl – Speed Scale Factor (MSBs)
SpdScl – Speed Scale Factor (LSBs)
SpdDecRate – Deceleration
SpdAccRate – Acceleration
Bit Position
4
(W)
(W)
The user should set SpdScl = 60 *
3
2
1
0