isp1507a NXP Semiconductors, isp1507a Datasheet - Page 11

• Manufacturer Part Number: isp1507a
• Description: Lpi Hi-speed Universal Serial Bus On-the-go Transceive
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ISP1507A_ISP1507B_1
Product data sheet
7.6.4 Charge pump
7.9.1 DATA[7:0]
7.7 Band gap reference voltage
7.8 Power-On Reset (POR)
7.9 Detailed description of pins
The ISP1507 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 the analog
circuitry. The band gap requires an accurate external reference, R
connected between the RREF pin and GND. For details, see
The ISP1507 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 ISP1507.
The ISP1507 is a Physical layer (PHY) containing a USB transceiver. DATA[7:0] is the
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
Fig 3.
9.
External capacitors connection
cp(C_A)-(C_B)
, is required between the C_A and C_B pins as shown in
Rev. 01 — 19 May 2008
Section
ISP1507
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)
ISP1507A; ISP1507B
7.9.8.
4.7 F
OTG V
004aab037
ULPI HS USB OTG transceiver
cp(C_A)-(C_B)
BUS
Section
BUS
RREF
at a nominal voltage
16.
depends on the
, resistor
© NXP B.V. 2008. All rights reserved.
Section 8
cp(C_A)-(C_B)
Figure
10 of 81
and
3,