DRV8842_15 Datasheet, PDF(10/27 Page) Texas Instruments

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DRV8842_15 Datasheet, PDF (10/27 Pages) Texas Instruments – DC Motor Driver IC

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DRV8842

SLVSAB8F â MAY 2010 â REVISED DECEMBER 2015

www.ti.com

The full-scale (100%) chopping current is calculated in Equation 1.

ICHOP

VREFX

5 u RISENSE

(1)

Example:

If a 0.25-â¦ sense resistor is used and the VREFx pin is 2.5 V, the full-scale (100%) chopping current will be

2.5 V / (5 x 0.25 â¦) = 2 A.

Five input pins (I0 - I4) are used to scale the current in the bridge as a percentage of the full-scale current set by

the VREF input pin and sense resistance. The I0 - I4 pins have internal pulldown resistors of approximately

100 kÎ©. The function of the pins is shown in Table 2.

I[4..0]

0x00h

0x01h

0x02h

0x03h

0x04h

0x05h

0x06h

0x07h

0x08h

0x09h

0x0Ah

0x0Bh

0x0Ch

0x0Dh

0x0Eh

0x0Fh

0x10h

0x11h

0x12h

0x13h

0x14h

0x15h

0x16h

0x17h

0x18h

0x19h

0x1Ah

0x1Bh

0x1Ch

0x1Dh

0x1Eh

0x1Fh

Table 2. Pin Functions

RELATIVE CURRENT

(% FULL-SCALE CHOPPING CURRENT)

10%

15%

20%

24%

29%

34%

38%

43%

47%

51%

56%

60%

63%

67%

71%

74%

77%

80%

83%

86%

88%

90%

92%

94%

96%

97%

98%

99%

100%

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