33937_09 Datasheet, PDF (38/48 Pages) Freescale Semiconductor, Inc – Three Phase Field Effect Transistor Pre-driver

FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
Status Register 1 (MODE Bits)
This register is read by sending the NULL1 command (000x xx01). This is guaranteed to not affect IC operation and returns
the following data:
Table 16. Status Register 1
SPI Data Bits
7
6
5
4
3
2
1
0
Results
Register 1
Read
0
Desaturation
Zero
Calibration Deadtime
0
Mode
Deadtime
Overflow Calibration
Set
FULLON
Mode
Lock
Bit
Reset
0
0
0
0
0
0
0
0
• Bit 0–Lock Bit indicates the IC registers (Deadtime, MASKn, CLINTn, and Mode) are locked. Any subsequent write to
these registers is ignored and will set the Write Error flag.
• Bit 1– is the present status of FULLON Mode. If this bit is set to “0”, the FULLON mode is not allowed. A “1” indicates the
IC can operate in FULLON Mode (both High Side and Low Side FETs of one phase can be simultaneously turned on).
• Bit 3–indicates Deadtime Calibration occurred. It will be “0” until a successful Deadtime command is executed. This
includes the Zero Deadtime setting, as well as a Calibration Overflow.
• Bit 4–is a flag for a Deadtime Calibration Overflow.
• Bit 5–is set if Zero Deadtime is commanded.
• Bit 6–reflects the current state of the Desaturation/Phase Error turn-off mode.
Status Register 2 (MASK bits)
This register is read by sending the NULL2 command (000x xx10). This is guaranteed to not affect IC operation and returns
the following data:
Table 17. Status Register 2
SPI Data Bits
7
Results
Register 2
Read
Mask1:3
Reset
1
6
Mask1:2
1
5
Mask1:1
1
4
Mask1:0
1
3
Mask0:3
1
2
Mask0:2
1
1
Mask0:1
1
0
Mask0:0
1
Status Register 3 (Deadtime)
This register is read by sending the NULL3 command (000x xx11). This is guaranteed to not affect IC operation and returns
the following data:
Table 18. Status Register 3
SPI Data Bits
7
6
5
4
3
2
1
0
Results
Register 3
Read
Dead7
Dead6
Dead5
Dead4
Dead3
Dead2
Dead1
Dead0
Reset
0
0
0
0
0
0
0
0
These bits represent the calibration applied to the internal oscillator to generate the requested deadtime. If calibration is not
yet performed, all these bits return 0 even though the actual dead time is the maximum.
33937
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Analog Integrated Circuit Device Data
Freescale Semiconductor