ISP1102 View Datasheet(PDF) - Philips Electronics
Part Name
Description
Manufacturer
ISP1102 Datasheet PDF : 23 Pages
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Philips Semiconductors
ISP1102
Advanced USB transceiver
7. Functional description
7.1 Function selection
Table 3: Function table
SUSPND OE D+, D−
L
L
driving/
receiving
RCV
active
L
H
receiving[1] active
H
L
driving
inactive[2]
H
H
high-Z[1] inactive[2]
VP/VPO VM/VMO Function
VPO input VMO input normal driving
(differential receiver
active)
VP output VM output receiving
VPO input VMO input driving during suspend
(differential receiver
inactive)
VP output VM output low-power state
[1] Signal levels on the D+ and D− pins are determined by other USB devices and external pull-up or
pull-down resistors.
[2] In the suspend mode (SUSPND = HIGH), the differential receiver is inactive and the output RCV is
always LOW. Out-of-suspend (K) signalling is detected via the single-ended receivers VP/VPO and
VM/VMO.
7.2 Operating functions
Table 4: Driving function using differential input data interface (pin OE = L)
VM/VMO
VP/VPO
Data
L
L
SE0
L
H
differential logic 1
H
L
differential logic 0
H
H
illegal state
Table 5: Receiving function (pin OE = H)
D+, D−
RCV
differential logic 0
L
differential logic 1
H
SE0
RCV*[1]
VP/VPO
L
H
L
VM/VMO
H
L
L
[1] RCV* denotes the signal level on output RCV just before the SE0 state occurs. This level is stable
during the SE0 period.
7.3 Power supply configurations
The ISP1102 can be used with different power supply configurations, which can be
changed dynamically. Table 7 provides an overview of the power supply
configurations.
Normal mode — VCC(I/O) is connected. VCC(5.0) is connected only, or VCC(5.0) and
Vreg(3.3) are connected.
For 5 V operation, VCC(5.0) is connected to a 5 V source (4.0 to 5.5 V). The internal
voltage regulator then produces 3.3 V for the USB connections.
9397 750 11228
Product data
Rev. 03 — 02 September 2003
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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