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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
36
Ω
36
Ω
USBPU
1.5 k
Ω
USB type B Connector
1
2
3
4
VCC
D-
D+
GND
X2
Rs
100
Lin
3.3
µH
X1
Cbk
0.01
µuF
Rf
1M
X1
48 MHz, series, 20-pF load
Cout
22 pF
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