isp1504c NXP Semiconductors, isp1504c Datasheet - Page 12

• Manufacturer Part Number: isp1504c
• Description: Ulpi Hi-speed Universal Serial Bus On-the-go Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ISP1504A_ISP1504C_1
Product data sheet
7.9.10 PSW_N
7.9.11 V
7.9.8 C_A and C_B
7.9.9 V
The C_A and C_B pins are to connect the flying capacitor of the charge pump. The output
current capability of the charge pump depends on the value of capacitor used, as shown
in
details, see
If the charge pump is not used, C_A and C_B must be left floating (not connected).
Table 3.
V
recommended. For details, see
PSW_N is an active LOW, open-drain output pin. This pin can be connected to an active
LOW, external V
power source. An external pull-up resistor, R
pin is open-drain, allowing ganged-mode power control for multiple USB ports. For
application details, see
If the link is in host mode, it can enable the external V
DRV_VBUS_EXT bit in the OTG Control register to logic 1. The ISP1504 will drive
PSW_N to LOW to enable the external V
overcurrent condition (the V
V
This pin acts as an input to V
pump, and SRP charge and discharge resistors.
When the DRV_VBUS bit of the OTG Control register is set to logic 1, the ISP1504 drives
V
The V
C
22 nF
270 nF
Fig 4. Charge pump capacitor
CC
BUS
BUS
CC
BUS
cp(C_A)-(C_B)
Table
is the main input supply voltage for the ISP1504. Decoupling capacitors are
power source by setting DRV_VBUS_EXT to logic 0.
to a voltage of 4.4 V to 5.25 V, with a minimum output current capability of 8 mA.
BUS
3. For maximum efficiency, place capacitors as close as possible to pins. For
pin requires a capacitive load as shown in
Recommended charge pump capacitor value
Section
BUS
16.
switch or charge pump enable circuit to control the external V
Rev. 01 — 19 October 2006
Section
BUS
BUS
ISP1504
16.
Section
state in RXCMD is not 11b), it must disable the external
comparators, and also as a power pin for the charge
C_B
16.
C_A
V
BUS
BUS
pullup
power source. If the link detects an
004aaa516
I
8 mA
50 mA
ISP1504A; ISP1504C
L
(max)
, is required when PSW_N is used. This
C cp(C_A)-(C_B)
Section
I L
BUS
ULPI HS USB OTG transceiver
power source by setting the
16.
© NXP B.V. 2006. All rights reserved.
BUS
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