MC13892_1107 Datasheet, PDF(63/158 Page) Freescale Semiconductor, Inc

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MC13892_1107 Datasheet, PDF (63/158 Pages) Freescale Semiconductor, Inc – Power Management Integrated

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FUNCTIONAL DEVICE OPERATION

OPERATING MODES

Table 26. Power Up Defaults Table

i.MX

37/51

27/31

PUMS1

GND

Open

VCOREDIG

VCORE

GND

Open

PUMS2

SW1 (49)

SW2 (49)

SW3 (49)

SW4 (49)

SWBST

VUSB

VUSB2

VPLL

VDIG

VIOHI

VGEN2

VSD

Open

0.775

1.025

1.200

1.800

Off

3.300 (50)

2.600

1.800

1.250

2.775

3.150

Off

Open

1.050

1.225

1.200

1.800

Off

3.300 (50)

2.600

1.800

1.250

2.775

Off

Open

1.050

1.225

1.200

1.800

Off

3.300 (50)

2.600

1.800

1.250

2.775

3.150

Off

Open

0.775

1.025

1.200

1.800

Off

3.300 (50)

2.600

1.800

1.250

2.775

Off

GND

1.200

1.350

1.800

5.000

3.300 (52)

2.600

1.500

1.250

2.775

3.150

GND

1.200

1.450

1.800

5.000

3.300 (52)

2.600

1.500

1.250

2.775

3.150

Notes

49. The switchers SWx are activated in PWM pulse skipping mode, but allowed when enabled by the startup sequencer.

50. USB supply VUSB, is only enabled if 5.0 V is present on UVBUS.

51. The following supplies are not included in the matrix since they are not intended for activation by the startup sequencer: VCAM, VGEN1,

VGEN3, VVIDEO, and VAUDIO

52. SWBST = 5.0 V powers up and does VUSB regardless of 5.0 V present on UVBUS. By default VUSB will be supplied by SWBST.

The power up sequence is shown in Table 27. VCOREDIG, VSRTC, and VCORE are brought up in the pre-sequencer startup.

Once VCOREDIG is activated (i.e., at the first-time power application), it will be continuously powered as long as a valid coin cell

is present.

Table 27. Power Up Sequence

Tap x 2ms

PUMS2 = Open (i.MX37, i.MX51)

PUMS2 = GND (i.MX35, i.MX27)

SW2

SW4

VGEN2

VIOHI

SW4

VGEN2

VIOHI, VSD

SW1

SWBST, VUSB (56)

SW3

SW1

VPLL

VDIG

SW3

VUSB (55), VUSB2

VDIG

VUSB2

Notes

53. Time slots may be included for blocks which are defined by the PUMS pin as disabled to allow for potential activation.

54. The following supplies are not included in the matrix since they are not intended for activation by the startup sequencer: VCAM,

VGEN1, VGEN3, VVIDEO, and VAUDIO. SWBST is not included on the PUMS2 = Open column.

55. USB supply VUSB, is only enabled if 5.0 V is present on UVBUS.

56. SWBST = 5.0 V powers up and so does VUSB regardless of 5.0 V present on UVBUS. By default VUSB will be supplied by SWBST.

Analog Integrated Circuit Device Data

Freescale Semiconductor

MC13892

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