isp1302 NXP Semiconductors, isp1302 Datasheet - Page 11

• Manufacturer Part Number: isp1302
• Description: Isp1302 Universal Serial Bus On-the-go Transceiver With Carkit Support
• Manufacturer: NXP Semiconductors

NXP Semiconductors
ISP1302_1
Product data sheet
7.6 3.3 V DC-DC regulator
7.7 Carkit DP interrupt detector
The built-in DC-DC regulator conditions the input power supply (V
the ISP1302.
When V
When V
automatically bypassed so that pin VREG will be shorted to pin V
When V
voltage between V
The output of the regulator can be monitored on pin VREG. A capacitor (0.1 F) must be
connected between pin VREG and ground.
The carkit DP interrupt detector is a comparator that detects the carkit interrupt signal on
the CR_INT pin in analog audio mode. Bit DP_INT will be set if the voltage level on the
CR_INT pin is below the carkit interrupt threshold V
The carkit interrupt detector is enabled in audio mode only (bit AUDIO_EN = 1).
Fig 6. DP and DM pull-up and pull-down resistors
DP
DM
CC
CC
CC
is greater than 3.6 V, the regulator will output 3.3 V
is less than 3.6 V and bit REG_BYPASS_DIS = 0, the regulator will be
is less than 3.6 V and bit REG_BYPASS_DIS = 1, the regulator will output a
0.525 k to
(14.3 k to
0.9 k to
1.575 k
1.515 k
24.8 k
15 k
CC
AGND
VREG
and V
Rev. 01 — 24 May 2007
R DN(DP)
DP_PULLDOWN
SW1
CC
0.2 V.
SW2
R weakUP(DP)
R DN(DM)
AGND
USB OTG transceiver with carkit support
150 k ± 30 %
SW3
15 k
(14.3 k to
24.8 k
DM_PULLDOWN
th(DP)L
(0.4 V to 0.6 V).
0.525 k to
0.9 k to
1.515 k
1.575 k
10 %.
CC
CC
) for use in the core of
.
SW1
© NXP B.V. 2007. All rights reserved.
ISP1302
004aaa658
SW2
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