isp1109 NXP Semiconductors, isp1109 Datasheet - Page 10

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

Philips Semiconductors
9397 750 13355
Product data sheet
7.5 Power block
7.6 Carkit DP interrupt detector
The DP pull-down resistor (R
the Resistor Control register is set.
The DM pull-down resistor (R
in the Resistor Control register is set.
The built-in DC-DC regulator conditions the input power supply (V
the ISP1109.
When V
than 3.6 V, the regulator will be bypassed and pin REG3V3 will be shorted to pin V
The output of the regulator can be monitored on pin REG3V3. A capacitor (0.1 F) will be
connected to pin REG3V3.
The carkit DP interrupt detector is a comparator that detects the carkit interrupt signal on
the DP line in analog audio mode. Bit DP_INT will be cleared (set to logic 0), if the voltage
level on the DP line is below the carkit interrupt threshold V
The carkit interrupt detector is enabled in audio mode only (bit AUDIO_EN = 1).
Fig 4. DP and DM pull-up and pull-down resistors.
CC
is greater than 3.6 V, the regulator will output 3.3 V
DM
DP
0.525 k to
(14.3 k to
0.9 k to
1.515 k
1.575 k
24.8 k
15 k
Rev. 01 — 14 July 2005
REG3V3
DN(DP)
DN(DM)
R DN(DP)
DP_PULLDOWN
SW1
) is connected to the DP line, if bit DP_PULLDOWN in
) is connected to the DM line, if bit DM_PULLDOWN
SW2
USB transceiver with carkit support
R weakUP(DP)
R DN(DM)
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
thPH(DP)L
130 k ± 30 %
SW3
15 k
(14.3 k to
24.8 k
10 %. When V
DM_PULLDOWN
CC
004aaa520
) for use in the core of
(0.4 V to 0.6 V).
ISP1109
CC
is less
CC
10 of 59
.