AMIS-30421 Datasheet, PDF (32/41 Pages) ON Semiconductor – Micro-Stepping Stepper Motor Bridge Controller

AMIS−30421
Table 14. CONTROL REGISTER 1 PARAMETERS
Parameter
Value
Value
Description
Info
0
DIRCTRL
1
CW
CCW
Defines the direction of rotation.
Remark: CW and CCW is relative. Direction of rotation will
be defined by the status of the DIR−pin and connection of
p19
the stepper motor!
0
Positive Edge
NXTP
Defines the active edge on the NXT−pin.
p19
1
Negative Edge
0
Push Pull
IO_OT
Defines the output type of WDb−, ERRb− and DO−pin
p24
1
Open Drain
0
Disabled
PWMJ
Enables or disables PWM jitter
p15
1
Enabled
00
01
NO_CROSS[1:0]
10
11
0 ns
250 ns
500 ns
1000 ns
Defines the time between switching off one MOSFET and
switching on the other MOSFET of the same half H−bridge
p13
(= t_nocross).
Remark: Bit 3 and bit 5 of Control Register 1 should always be ‘0’ (zero)!
Control Register 2 (CR2)
Control Register 2 is located at address 0x03 and can be used to enable the motor driver and to put the motor driver in sleep
mode. It also has some parameters that can be used to set the SLA.
Table 15. CONTROL REGISTER 2
Address
0x03
Access
Reset
Data
Bit 7
R/W
0
MOTEN
Bit 6
R/W
0
SLP
Control Register 2 (CR2)
Bit 5
Bit 4
R/W
R/W
0
0
−
SLAT
Bit 3
R/W
0
Bit 2
R/W
0
SLAG[2:0]
Bit 1
R/W
0
Bit 0
R/W
0
SLA_OFFS
Table 16. CONTROL REGISTER 2 PARAMETERS
Parameter
Value
Value
Description
Info
0
MOTEN
1
Disabled
Enabled
Enables the PWM regulator.
Remark: the regulator is automatically disabled if one of the
p19
bits in Status Register 1 or 2 is set.
0
Normal Mode
SLP
Enables the sleep mode (power down mode)
p22
1
Sleep Mode
0
Not Transparent
SLAT
Defines the type of SLA sampling.
p20
1
Transparent
000
1
001
0.5
010
0.25
011
SLAG[2:0]
100
0.125
0.0625
Defines the motor terminal voltage division factor for the
SLA−pin.
p20
101
0.0625
110
0.0625
111
0.0625
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