SABRE-LL-I datasheet(59/141 Pages) STMICROELECTRONICS

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SABRE-LL-I

Power bridges

59/141

Note: It is intended as clockwise the sequence that forces a clockwise rotation of the versors representing the

current module and phase.

An internal DAC is used to digitally control the output regulated current. The available

values are chosen to provide a quasi sinusoidal profile of the current. The current limit in

each phase is decided by PhADAC[3:0] bits for phase A and PhBDAC[3:0] bits for phase B.

The table below describes the relation between the value programmed in the stepper DAC

and the current level:

Note: The Min and Max values are guaranteed by testing the percentage of VSTEPREF that allows the

commuatation of the Rsense comparator.

IMAX=VSTEPREF/ RSENSE.

To obtain the best phase approximation of a sinusoidal wave, the user needs to repeat the final (100%)

value. So the full values sequence should be as follows: 0, 1, 2, 3 … D, E, F, F, F, E, D … 3, 2, 1, 0.

Even if the total spread shows overlapping between current steps, the monotonicity is guaranteed by

design.

Table 38.

Stepper sequencer direction

StepDir

Direction

Counter Clockwise (CCW)

Clockwise (CW)

Table 39.

DAC

PhXDAC [3:0]

Phase Current ratio respect to IMAX

Min

Typ

Max

Unit

0000

(Hi-Z)

0001

7.8

9.8

11.8

% of IMAX

0010

17.5

19.5

21.5

% of IMAX

0011

27.0

29.0

31.0

% of IMAX

0100

36.3

38.3

40.3

% of IMAX

0101

45.1

47.1

49.1

% of IMAX

0110

53.6

55.6

57.6

% of IMAX

0111

61.4

63.4

65.4

% of IMAX

1000

68.7

70.7

72.7

% of IMAX

1001

75.3

77.3

79.3

% of IMAX

1010

81.1

83.1

85.1

% of IMAX

1011

86.2

88.2

90.2

% of IMAX

1100

90.4

92.4

94.4

% of IMAX

1101

93.7

95.7

97.7

% of IMAX

1110

96.5

98.1

99.7

% of IMAX

1111

IMAX

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