ISP1301 datasheet(8/46 Pages) PHILIPS

8 / 46 page

Philips Semiconductors

ISP1301

USB OTG transceiver

Product data

Rev. 01 — 14 April 2004

8 of 46

9397 750 11355

8.4 ID detector

In either the active or suspended power mode, the ID detector senses the condition of

the ID line and differentiates between the following three conditions:

• Pin ID is ﬂoating; bit ID_FLOAT = 1

• Pin ID is shorted to ground; bit ID_GND = 1

• Pin ID is connected to ground through resistor RACC_ID; bit ID_FLOAT = 0 and bit

ID_GND = 0.

The ID detector also has a switch that can be used to ground pin ID. This switch is

controlled by bit ID_PULLDOWN in the serial controller.

8.5 Pull-up and pull-down resistors

The pull-up and pull-down resistors include the following switchable resistors:

• Pin DP pull-up

• Pin DP pull-down

• Pin DM pull-up

• Pin DM pull-down.

The pull-up resistor is a context variable as described in the

ECN_27%_Resistor

document. The variable pull-up resistor hardware is implemented to meet the USB

ECN_27% speciﬁcation.

8.6 USB transceiver (ATX)

The behavior of the USB transceiver depends on the operation mode of the ISP1301:

• In the USB mode, the USB transceiver block performs USB full-speed or

low-speed transceiver functions. This includes differential driver, differential

receiver and single-ended receivers.

• In the transparent general purpose buffer mode or the UART mode, the USB

transceiver block functions as a level shifter between the pins DAT/VP and SE0/VM

and the pins DP and DM.

8.7 3.3 V DC-DC regulator

The built-in 3.3 V DC-DC regulator conditions the supply voltage (VBAT) for use in the

ISP1301:

• VBAT = 3.6 V to 4.5 V: the regulator will output 3.3 V ± 10 %

• VBAT < 3.6 V: the regulator will be bypassed.

The output of the regulator can be monitored on the VREG(3V3) pin.

8.8 Car kit interrupt detector

The car kit interrupt detector is a comparator that detects when the DP line is below

the car kit interrupt threshold VPH_CR_INT (0.4 V to 0.6 V). The car kit interrupt

detector is enabled in the audio mode only (bit AUDIO_EN = 1).

ISP1301 Datasheet(PDF) 8 Page - NXP Semiconductors

ISP1301 Datasheet(HTML) 8 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

Datasheet Download

Link URL