isp1512a NXP Semiconductors, isp1512a Datasheet - Page 11

• Manufacturer Part Number: isp1512a
• Description: Ulpi Hi-speed Usb Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ISP1512A_1
Preliminary data sheet
8.10.1 DATA[7:0]
8.10.2 V
8.10.3 RREF
8.10.4 DP and DM
8.10.5 V
8.10 Detailed description of pins
to t3 for greater than t
is less than t
LOW.
Bidirectional data bus pins. 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. Weak
pull-down resistors are incorporated into DATA[7:0] pins as part of the interface protect
feature.
DATA[7:0] pins can also be 3-stated when pin CHIP_SEL is deasserted.
The data bus can be reconfigured to carry various data types. For details, see
The input power pin that sets the I/O voltage level. A 0.1 F decoupling capacitor is
recommended on this pin.
Resistor reference analog I/O pin. A 12 k
RREF pin and GND. This provides an accurate voltage reference that biases the internal
analog circuitry. Less accurate resistors cannot be used and will render the ISP1512A
unusable.
When the ISP1512A is in USB mode, the DP pin functions as the USB data plus line, and
the DM pin functions as the USB data minus line.
When the ISP1512A is in transparent UART mode, the DP pin functions as the UART
RXD input pin, and the DM pin functions as the UART TXD output pin.
The DP and DM pins must be connected to the D+ and D pins of the USB receptacle.
Main input supply voltage for the ISP1512A. The ISP1512A operates correctly when V
is between 3.0 V and 4.5 V. A 0.1 F decoupling capacitor is recommended.
Fig 3.
CC(I/O)
CC
Internal power-on reset timing
t0
w(REG1V8_L)
t1
w(REG1V8_L)
, the internal POR pulse will not be generated and will remain
Rev. 01 — 31 July 2008
, another POR pulse is generated. If the dip from t4 to t5
t2
1 % resistor must be connected between the
t3
t4
t5
ULPI HS USB transceiver
ISP1512A
© NXP B.V. 2008. All rights reserved.
004aab023
REG1V8
V
POR
POR(trip)
Section
10 of 55
9.2.
CC