STULPI01A datasheet(21/44 Pages) STMICROELECTRONICS

Part #	STULPI01A

Description	High speed USB On-The-Go ULPI transceiver

PDF	44 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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21 / 44 page

STULPI01A - STULPI01B

Block description

21/44

6.12

Power saving features

To reduce power consumption STULPI01 implements 2 low power modes of operation.

1. Low power mode, which is defined in ULPI specification.

2. Power-down mode to save more power in case USB function is not needed.

More information on these modes can be found in following paragraph:

6.13

Modes of operation

6.13.1

ULPI synchronous mode

STULPI01 transceiver supports SDR mode operation (12 pin interface). The selection of

SDR mode is performed during startup reset procedure.

6.13.2

6 pin FS/LS serial mode

This mode is entered by writing to corresponding bit in the Interface Control register.

6.13.3

3 pin FS/LS serial mode

This mode is entered by writing to corresponding bit in the Interface Control register.

Figure 7.

USB 2.0 PHY block diagram

Ser-Des

LS/FS

Ser-Des

45 Ω

HS Disconnect Det.

Squelch Detector

LS/FS SE Receivers

3.3V

1.5kΩ

19.25kΩ

3.3V

1.5kΩ

19.25kΩ

STULPI01A Datasheet(PDF) 21 Page - STMicroelectronics