ISP1705AETTM STEricsson, ISP1705AETTM Datasheet - Page 23

• Manufacturer Part Number: ISP1705AETTM
• Manufacturer: STEricsson

Specifications of ISP1705AETTM

• Lead Free Status / RoHS Status: Compliant

9. Modes of operation
ISP1705_2
Product data sheet
9.1.1 Normal mode
9.1.2 Power-down mode
9.1 Power modes
When both V
to all the remaining pins, including V
range will not damage the ISP1705 chip.
When both V
ISP1705 will be fully functional as in normal mode.
When V
ISP1705, the application system must detect the low voltage condition and set chip select
to deassert (that is, put the ISP1705 in Power-down mode). This is to protect the ULPI and
USB interfaces from driving wrong levels. Under this condition, the V
leak to USB pins (V
Section
must be driven to a defined state or terminated by using pull-up or pull-down resistors to
avoid a floating input condition. Other pins (see
In normal mode, both V
is fully functional.
When V
Power-down mode. In this mode, internal regulators are powered down to keep the V
current to a minimum. The voltage on the V
pins. In this mode, the ISP1705 pin states are given in
Table 9.
[1]
[2]
When V
V
Pin name
V
V
CHIP_SEL, CHIP_SEL_N
CFG1, CFG2, RESET_N, CLOCK, STP, NXT,
DIR, DATA[7:0]
CFG0, DP, DM, ID, REG1V8, REG3V3, XTAL1,
XTAL2, RREF, PSW_N, FAULT
CC(I/O)
CC
CC(I/O)
When I/O pins are not powered, the input buffer is disabled and will ignore the external input level. The
input pins, however, should not be driven by another voltage source to prevent leakage.
These pins must not be externally driven to HIGH. Otherwise, the ISP1705 behavior is undefined and
leakage current will occur.
CC(I/O)
CC(I/O)
CC(I/O)
are not powered. Other pins (see
8.12.2) powered by V
[1]
Pin states in Power-down mode
CC(I/O)
CC
is powered and the V
is not present or when chip select is deasserted, the ISP1705 is put into
is not present, all the digital pins (see
and V
and V
BUS
Rev. 02 — 21 January 2009
CC(I/O)
, DP, DM and ID) and the V
CC
CC
and V
are not powered, there will be no leakage from the V
are powered and are within the operating voltage range, the
CC(I/O)
CC(I/O)
CC
are configured as high-impedance inputs. These pins
CC
are powered. Chip select is asserted. The ISP1705
voltage is below the operating range of the
and V
Section
CC
CC(I/O)
Pin state when
V
present
3.0 V to 4.5 V
not powered
not powered
not powered
not powered
pin will not leak to the V
CC(I/O)
Section
8.12.9) are also not powered.
CC
. Applying V
Section
is not
pin. All the digital pins (see
Table
ULPI Hi-Speed USB transceiver
8.12.9) are not powered.
[2]
[2]
[2]
[2]
8.12.2) that are powered by
9.
BUS
Pin state when V
present and chip select
is not active
3.0 V to 4.5 V
3.0 V to 3.6 V
HIGH
3.0 V to 3.3 V
not powered
© ST-NXP Wireless 2009. All rights reserved.
within the normal
CC(I/O)
CC(I/O)
ISP1705
voltage will not
[2]
and/or V
CC(I/O)
BUS
22 of 89
CC
pin
BUS
is