isp1504c NXP Semiconductors, isp1504c Datasheet - Page 10

• 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
7.6.4 Charge pump
7.9.1 DATA[7:0]
7.9.2 V
7.7 Band gap reference voltage
7.8 Power-On Reset (POR)
7.9 Detailed description of pins
The ISP1504 uses a built-in charge pump to supply current to V
of 5 V. The charge pump works as a capacitive DC-DC converter. An external holding
capacitor, C
which also shows a typical OTG V
amount of current drive required. If the internal charge pump is not used, the C
capacitor is not required.
For details on the C_A and C_B pins, see
The band gap circuit provides a stable internal voltage reference to bias analog circuitry.
The band gap requires an accurate external reference, R
between the RREF pin and GND. For details, see
The ISP1504 has an internal power-on reset circuit that resets all internal logic on
power-up. The ULPI interface is also reset on power-up.
Remark: When CLOCK starts toggling after power-up, the USB link must issue a reset
command over the ULPI bus to ensure correct operation of the ISP1504.
Bidirectional data bus. The USB link must drive DATA[7:0] to LOW when the ULPI bus is
idle. When the link has data to transmit to the PHY, it drives a nonzero value.
The data bus can be reconfigured to carry various data types, as given in
Section
The DATA[7:0] pins can be 3-stated by driving pin CHIP_SELECT_N to HIGH. Weak
pull-down resistors are incorporated into the DATA[7:0] pins as part of the interface protect
feature. For details, see
The input power pin that sets the I/O voltage level. For details, see
and
Fig 3. External capacitors connection
CC(I/O)
Section
9.
cp(C_A)-(C_B)
16. V
CC(I/O)
Rev. 01 — 19 October 2006
, is required between the C_A and C_B pins as shown in
Section
provides power to on-chip pads of the following pins:
ISP1504
V
9.3.1.
C_B
C_A
BUS
BUS
load. The value of C
Section
0.1 F
C cp(C_A)-(C_B)
ISP1504A; ISP1504C
Section
7.9.8.
4.7 F
OTG V
004aaa515
RREF
ULPI HS USB OTG transceiver
16.
cp(C_A)-(C_B)
BUS
, resistor connected
BUS
Section
at a nominal voltage
depends on the
© NXP B.V. 2006. All rights reserved.
Section 8
12,
cp(C_A)-(C_B)
Section 13
Figure
10 of 84
and
3,