isp1760 NXP Semiconductors, isp1760 Datasheet - Page 24

• Manufacturer Part Number: isp1760
• Description: Hi-speed Universal Serial Bus Host Controller For Embedded Applications
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9397 750 13257
Product data sheet
7.8 Power supply
The digital overcurrent scheme requires using an external power switch with integrated
overcurrent detection, such as: LM3526, MIC2526 (2 ports) or LM3544 (4 ports). These
devices are controlled by PSWn_N signals corresponding to each port. In the case of
overcurrent occurrence, these devices will assert OCn_N signals. On OCn_N assertion,
the ISP1760 cuts off the port power by deasserting PSWn_N. The external integrated
power switch will also automatically cut-off the port power in the case of an overcurrent
event, by implementing thermal shutdown. An internal delay filter of 1 ms to 3 ms will
prevent false overcurrent reporting because of in-rush currents when plugging a USB
device.
Figure 6
Fig 5. Adjusting analog overcurrent detection limit (optional).
Fig 6. ISP1760 power supply connection.
I
OC(nom)
(1) R
shows the ISP1760 power supply connection.
td
= 1 A.
is optional.
Rev. 01 — 8 November 2004
5 V
ISP1760
10, 40, 48,
59, 67, 75,
5, 50, 118
104, 115
004aaa533
83, 94,
REF5V
6, 7
85
9
V
V
V
V
V
CC(5V0)
CC(I/O)
REG(1V8)
REG(1V8)
REG(3V3)
10 µF
ISP1760
PSWn_N
Embedded Hi-Speed USB host controller
10 µF
100 nF
100 nF
100 nF
1.65 V to 3.6 V
004aaa662
100 nF
OCn_N
3.3 V to 5 V
R
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
td
I
100 nF
OC
(1)
ISP1760
24 of 105