ISP1161A1BMGA STEricsson, ISP1161A1BMGA Datasheet - Page 39

• Manufacturer Part Number: ISP1161A1BMGA
• Manufacturer: STEricsson

Specifications of ISP1161A1BMGA

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

ISP1161A1_5
Product data sheet
9.8 OC detection and power switching control
A downstream port provides 5 V power supply to V
hardware functions to monitor the downstream ports loading conditions and control their
power switching. These hardware functions are implemented by the internal power
switching control circuit and overcurrent detection circuit. H_PSW1 and H_PSW2 are
power switching control output pins (active LOW, open-drain) for downstream
ports 1 and 2, respectively. H_OC1 and H_OC2 are overcurrent detection input pins for
downstream ports 1 and 2, respectively.
Figure 34
represents the downstream port numbers, n = 1 or 2).
Fig 33. Use of 15 kΩ pull-down resistors on downstream ports.
Fig 34. Downstream port power management scheme.
Using either internal or external 15 kΩ resistors.
‘n’ represents the downstream port number (n = 1 or 2)
shows the ISP1161A1 downstream port power management scheme (‘n’
Configuration
HcHardware
(+5 V or +3.3 V)
H_PSWn
H_OCn
V CC
Rev. 05 — 29 September 2009
internal
15 kΩ
ISP1161A1
(2×)
bit 12
OC detect
regulator
004aaa180
≥
D−
D+
USB single-chip host and device controller
22 Ω
22 Ω
ISP1161A1
OC select
1
0 Reg
PSW
C/L
BUS
HC CORE
. The ISP1161A1 has built-in
Configuration
HcHardware
external
15 kΩ
(2×)
V BUS
bit 10
47 pF
ISP1161A1
(2×)
004aaa181
© ST-ERICSSON 2009. All rights reserved.
connector
USB
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