SL11RIDE
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.
USBPU
1.5 kΩ
USB type B Connector
36Ω
36Ω
1
2
3
4
VCC
D-
D+
GND
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.
X1
X2
Rf
1M
X1
Cbk
0.01 µuF
48 MHz, series, 20-pF load
Lin
3.3 µH
Rs
100
Cout
22 pF
Figure 4-2. Full-Speed 48-MHz Crystal Circuit
Document #: 38-08007 Rev. **
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