AMIS-30421 Datasheet, PDF (35/41 Pages) ON Semiconductor – Micro-Stepping Stepper Motor Bridge Controller

AMIS−30421
Status Register 3 (SR3)
Status Register 3 is located at address 0x07 and can only be read. Status Register 3 contains the microstepping position and
can be used to retrieve the position in the translator table (see Table 7). It is a non−latched register meaning that the
microstepping position can be updated by the motor driver at any moment. Status Register 3 does not contain a parity bit.
Table 23. STATUS REGISTER 3
Address
0x07
Access
Reset
Data
Bit 7
R
0
Bit 6
R
0
Status Register 3 (SR3)
Bit 5
Bit 4
Bit 3
R
R
R
0
0
0
MSP[7:0]
Bit 2
R
0
Bit 1
R
0
Bit 0
R
0
Table 24. STATUS REGISTER 3 PARAMETERS
Parameter
Value
Value
Description
Info
MSP[7:0]
xxxx xxxx Microstepping position Indicates the position within the translator table
p19
Predriver Register 0 (PDRV0)
Predriver Register 0 is located at address 0x09 and can be used to set the current source for the gate charge of the external
top MOSFET’s during t₁ (see Figure 11).
Table 25. PREDRIVER REGISTER 0
Address
0x09
Access
Reset
Data
Bit 7
R/W
0
Predriver Register 0 (PDRV0)
Bit 6
Bit 5
Bit 4
R/W
R/W
R/W
1
0
1
TOP_ION1[6:3]
Bit 3
R/W
0
−
Bit 2
R/W
0
Bit 1
R/W
1
TOP_ION1[2:0]
Bit 0
R/W
1
Table 26. PREDRIVER REGISTER 0 PARAMETERS
Parameter
Value
Value
Description
Info
TOP_ION1[6:3]
TOP_ION1[2:0]
xxxx
xxx
Current source
value
Defines the current source for the external top MOSFET’s during t₁.
Current source can be calculated as next:
1 mA + (PDRV0[7:4] x 2 mA) + 0.25 mA + (PDRV0[2:0] x 0.25 mA)
p13
Predriver Register 1 (PDRV1)
Predriver Register 1 is located at address 0x0A and can be used to set the current source for the gate charge of the external
top MOSFET’s during t₂ (see Figure 11).
Table 27. PREDRIVER REGISTER 1
Address
0x0A
Access
Reset
Data
Bit 7
R/W
0
Predriver Register 1 (PDRV1)
Bit 6
Bit 5
Bit 4
R/W
R/W
R/W
0
0
0
TOP_ION2[6:3]
Bit 3
R/W
0
−
Bit 2
R/W
0
Bit 1
R/W
1
TOP_ION2[2:0]
Bit 0
R/W
1
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