isp1109 NXP Semiconductors, isp1109 Datasheet - Page 15

• Manufacturer Part Number: isp1109
• Description: Universal Serial Bus Transceiver With Carkit Support
• Manufacturer: NXP Semiconductors

Philips Semiconductors
8. Modes of operation
9397 750 13355
Product data sheet
8.1.1 Normal mode
8.1.2 Disable mode
8.1.3 Isolate mode
8.1 Power modes
The ISP1109 supports four types of modes:
In this mode, both V
operation range (V
There are three levels of power saving schemes in the ISP1109:
In disable mode, V
Power-down state, if V
When V
When V
pin ISET, if any of the following conditions is detected:
If the preceding condition is detected, pin ISET will be asserted within 1.5 ms when V
rises above V
The USB differential driver will be set in three-state as long as V
pull-up resistor (R
resistor (R
In isolate mode, V
stable level to all digital output pins, and all bidirectional digital pins will be set in
three-state.
Table 10
•
•
•
•
•
•
•
•
•
Power modes
Serial control modes
USB modes
Transparent modes.
Active power mode: Power is on; all circuits are active.
USB suspend mode: To reduce power consumption, the USB differential receiver is
powered off.
Power-down mode: Set by writing logic 1 to bit PWR_DN of the Mode Control 2
register. The clock generator and all biasing circuits are turned off to reduce power
consumption to the minimum possible; typically I
waking up the clock, see
Voltage on pin ID is greater than V
DP and DM are single-ended one (SE1).
CC
BUS
shows a summary of power modes.
weakUP(DP)
is below threshold V
> V
th(ISET)
th(svc)
UP(DP)
CC
CC
CC(I/O)
.
CC
) will be connected if the V
is cut-off and V
and V
BUS
and V
Rev. 01 — 14 July 2005
3.0 V, V
) will be disconnected from the DP line. The DP weak pull-up
is cut-off and V
is below SESS_VLD threshold (0.8 V to 2.0 V).
CC
CC(I/O)
Section
rises above V
th(ISET)
CC(I/O)
are connected and their voltage levels are within the
CC(I/O)
10.
, pin ISET will remain at the LOW level.
th(ID_FM)
1.65 V, V
CC
is powered. In this mode, the ISP1109 will drive
is powered. In this mode, the ISP1109 is in
th(ISET)
BUS
CC(I/O)
, the ISP1109 will output HIGH on
voltage is above V
USB transceiver with carkit support
CC
is less than 20 A. For details on
V
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
CC
).
CC(I/O)
th(svc)
is lost. The DP
ISP1109
.
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CC