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| ISP1582 Datasheet, PDF (19/69 Pages) NXP Semiconductors – Hi-Speed Universal Serial Bus peripheral controller | |||
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NXP Semiconductors
7.15.1 Self-powered mode
ISP1582
Hi-Speed USB peripheral controller
VCC
1.5 kâ¦
RPU
VBUS
ISP1582
VCC(I/O)
VBUS
1 µF
1 Mâ¦
USB
ISP1582_7
Product data sheet
004aaa460
VCC(I/O) and VCC are system powered.
Fig 11. Self-powered mode
In self-powered mode, VCC and VCC(I/O) are supplied by the system. See Figure 11.
Table 7. Operation truth table for SoftConnect
ISP1582 operation
Power supply
VCC
VCC(I/O)
Normal bus operation
No pull-up on DP
3.3 V 3.3 V
3.3 V 3.3 V
RPU
(3.3 V)
3.3 V
3.3 V
VBUS
5V
0 V[1]
Bit SOFTCT in
Mode register
enabled
disabled
[1] When the USB cable is removed, SoftConnect is disabled.
Table 8. Operation truth table for clock off during suspend
ISP1582 operation
Power supply
VCC
VCC(I/O) RPU
(3.3 V)
Clock will wake up:
3.3 V 3.3 V 3.3 V
After resume and
After a bus reset
Clock will wake up:
3.3 V 3.3 V 3.3 V
After detecting the presence of VBUS
VBUS
5V
0Vâ5V
Clock off
during
suspend
enabled
enabled
Table 9. Operation truth table for back voltage compliance
ISP1582 operation
Power supply
VCC
VCC(I/O) RPU VBUS
(3.3 V)
Back voltage is not measured in this
mode
3.3 V 3.3 V 3.3 V 5 V
Back voltage is not an issue because pull 3.3 V
up on DP will not be present when VBUS
is not present
3.3 V
3.3 V 0 V
Bit SOFTCT
in Mode
register
enabled
disabled
Rev. 07 â 22 September 2008
© NXP B.V. 2008. All rights reserved.
18 of 68
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