Analog Integrated Circuit Device Data

Freescale Semiconductor

37

33937

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:

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:

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 15. Status Register 1

SPI Data Bits

765

432

10

Results

Register 1

Read

0

Desaturation

Mode

Zero

Deadtime

Set

Calibration

Overflow

Deadtime

Calibration

0

FULLON

Mode

Lock

Bit

Reset

000

000

00

• 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.

Table 16. Status Register 2

SPI Data Bits

765

432

10

Results

Register 2

Read

Mask1:3

Mask1:2

Mask1:1

Mask1:0

Mask0:3

Mask0:2

Mask0:1

Mask0:0

Reset

111

111

11

Table 17. Status Register 3

SPI Data Bits

765

432

10

Results

Register 3

Read

Dead7

Dead6

Dead5

Dead4

Dead3

Dead2

Dead1

Dead0

Reset

000

000

00

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.