ISP1104 Datasheet, PDF (6/19 Pages) NXP Semiconductors – Advanced Universal Serial Bus transceiver

Philips Semiconductors
ISP1104
Advanced USB transceiver
9397 750 11229
Product data
7.3 Power supply configurations
The ISP1104 can be used with different power supply configurations, which can be
changed dynamically. Table 8 provides an overview of power supply configurations.
Normal mode — Both V_CC(I/O) and V_CC(5.0) are connected. For 5 V operation,
V_CC(5.0) is connected to a 5 V source (4.0 V to 5.5 V). The internal voltage regulator
then produces 3.3 V for USB connections. V_CC(I/O) is independently connected to a
voltage source (1.65 V to 3.6 V), depending on the supply voltage of the external
circuit.
Disable mode — V_CC(I/O) is not connected and V_CC(5.0) is connected. In this mode,
the internal circuits of the ISP1104 ensure that the D+ and D− pins are in three-state
and the power consumption drops to the low-power (suspended) state level. Some
hysteresis is built into the detection of V_CC(I/O) lost.
Sharing mode — V_CC(I/O) is connected and V_CC(5.0) < 3.6 V to differentiate between
the USB mode and other modes when sharing the V_BUS. In this mode, pins D+ and
D− are made three-state and the ISP1104 allows external signals of up to 3.6 V to
share the D+ and D− lines. The internal circuits of the ISP1104 ensure that virtually
no current (maximum 10 µA) is drawn via the D+ and D− lines. The power
consumption through pin V_CC(I/O) and pin V_CC(5.0) drops to the low-power (suspended)
state level. Pins VP and VM are driven HIGH and pins VBUSDET and RCV are driven
LOW to indicate this mode. Some hysteresis is built into the detection of V_CC(5.0) lost.
Table 7: Pin states in disable or sharing mode
Pin
Disable mode
V_CC(5.0)
V_reg(3.3)
V_CC(I/O)
V_pu(3.3)
D+, D−
5 V input
3.3 V output
not present
high impedance (off)
high impedance
VP, VM
invalid^[1]
RCV
invalid^[1]
VBUSDET
invalid^[1]
VPO/VO, VMO/FSE0, MODE,
SUSPND, OE, SOFTCON
high impedance
Sharing mode
<3.6 V
pulled-down
1.65 V to 3.6 V input
high impedance (off)
high impedance
H
L
L
high impedance
[1] High impedance or driven LOW.
Table 8: Power supply configuration overview
V_CC(5.0)
connected
V_CC(I/O)
connected
Configuration
normal mode
connected
not connected disable mode
not connected connected
or <3.6 V
sharing mode
Special characteristics
-
D+, D− and V_pu(3.3) high impedance;
VP, VM, RCV: invalid^[1][2]
D+, D− and V_pu(3.3) high impedance;
VP, VM driven HIGH; RCV driven
LOW; VBUSDET driven LOW; V_reg(3.3)
pulled-down
[1] High impedance or driven LOW.
[2] V_reg(3.3) may not be operational.
Rev. 02 — 14 October 2003
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
6 of 19