AMIS-30421 Datasheet, PDF (30/41 Pages) ON Semiconductor – Micro-Stepping Stepper Motor Bridge Controller

AMIS−30421
Table 8. SPI REGISTER OVERVIEW
SPI Register
Predriver Register 1
Predriver Register 2
Predriver Register 3
Predriver Register 4
Predriver Register 5
Predriver Register 6
Predriver Register 7
Where: R/W = read and write access, R = read access only
Address
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Abbreviation
PDRV1
PDRV2
PDRV3
PDRV4
PDRV5
PDRV6
PDRV7
Watchdog Register (WR)
The Watchdog Register is located at address 0x00 and can be used to enable the watchdog and set the watchdog time−out.
It can also be used to set the short circuit and open coil detection time−out.
Table 9. WATCHDOG REGISTER
Watchdog Register (WR)
Address
Bit 7
Bit 6 Bit 5 Bit 4 Bit 3
Bit 2
Bit 1
Bit 0
Access
R/W
R/W R/W R/W R/W
R/W
R/W
R/W
0x00
Reset
0
0
0
0
0
1
0
0
Data
WDEN
WDT[3:0]
OPEN_COIL[1:0]
−
Table 10. WATCHDOG REGISTER PARAMETERS
Parameter
Value
Value
Description
Info
WDEN
WDT[3:0]
OPEN_COIL[1:0]
0
1
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
00
01
10
11
Disable
Enable
32 ms
64 ms
96 ms
128 ms
160 ms
192 ms
224 ms
256 ms
288 ms
320 ms
352 ms
384 ms
416 ms
448 ms
480 ms
512 ms
2.56 ms
0.32 ms
20.48 ms
163.84 ms
Enables the watchdog
p24
Defines the watchdog time−out period. The watchdog needs
to be re−enabled (WDEN) within this time or WDb−pin is ac-
p24
tivated for t_POR.
Defines the open coil detection time−out. If an open coil is
detected for a time longer than OpenTimeOut[1:0], an open
coil (OPEN_X and/or OPEN_Y) will be reported.
p23
Note: Short circuit could trigger open coil detection.
Remark: Bit 0 of Watchdog Register should always be ‘0’ (zero)!
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