SL11RIDE datasheet(6/27 Pages) CYPRESS

6 / 27 page

SL11RIDE

Document #: 38-08007 Rev. **

Page 6 of 27

Max at 4 MHz CPU speed: 4.0 mA (USB is on)

Max at 32 MHz CPU speed: 25.0 mA (USB is on)

Max at 48 MHz CPU speed: 30.0 mA (USB is on)

4.5

Functions for Suspend, Resume, and Low-Power modes

The SL11RIDE’s CPU supports suspend, resume, and CPU low power mode. The SL11RIDE BIOS assigns USBPU for the USB

DATA+ line pull-up, which simulates USB cable removal or insertion while USB power is still applied to the board.

Figure 4-1. USBPU Pull-up Connection Example

4.6

PLL Clock Generator

A 48-MHz external crystal can be used with the SL11RIDE. Two pins, X1 and X2, are provided to connect a low-cost crystal circuit

to the device. Circuitry is provided to generate the internal clock requirements of the device. If an external 48-MHz clock is available

in the application, it may be used instead of the crystal circuit by connecting directly to the X1 input pin.

Figure 4-2. Full-Speed 48-MHz Crystal Circuit

Ω

USBPU

1.5 k

Ω

USB type B Connector

VCC

D-

D+

GND

100

Lin

3.3

µH

Cbk

0.01

µuF

48 MHz, series, 20-pF load

Cout

22 pF

SL11RIDE Datasheet(PDF) 6 Page - Cypress Semiconductor