ISP1109 Просмотр технического описания (PDF) - Philips Electronics
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ISP1109 Datasheet PDF : 59 Pages
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Philips Semiconductors
ISP1109
USB transceiver with carkit support
The DP pull-down resistor (RDN(DP)) is connected to the DP line, if bit DP_PULLDOWN in
the Resistor Control register is set.
The DM pull-down resistor (RDN(DM)) is connected to the DM line, if bit DM_PULLDOWN
in the Resistor Control register is set.
REG3V3
0.525 kΩ to
1.515 kΩ
SW2
RweakUP(DP) 130 kΩ ± 30 %
SW1
SW3
0.9 kΩ to
1.575 kΩ
DP
DM
DP_PULLDOWN
DM_PULLDOWN
15 kΩ
(14.3 kΩ to
24.8 kΩ)
RDN(DP)
RDN(DM)
15 kΩ
(14.3 kΩ to
24.8 kΩ)
004aaa520
Fig 4. DP and DM pull-up and pull-down resistors.
7.5 Power block
The built-in DC-DC regulator conditions the input power supply (VCC) for use in the core of
the ISP1109.
When VCC is greater than 3.6 V, the regulator will output 3.3 V ± 10 %. When VCC is less
than 3.6 V, the regulator will be bypassed and pin REG3V3 will be shorted to pin VCC.
The output of the regulator can be monitored on pin REG3V3. A capacitor (0.1 µF) will be
connected to pin REG3V3.
7.6 Carkit DP interrupt detector
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 VthPH(DP)L (0.4 V to 0.6 V).
The carkit interrupt detector is enabled in audio mode only (bit AUDIO_EN = 1).
9397 750 13355
Product data sheet
Rev. 01 — 14 July 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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