Silicon Laboratories Si825x, Руководство пользователя

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S i 8 2 5 x M u l t i - P h a s e P O L - R D
22 Rev. 0.2
11. USB Debug Adapter
The USB Debug Adapter provides the interface between the PC’s USB port and the Si825x’s in-system debug/
programming circuitry. The attached 10-pin DEBUG ribbon cable connects the adapter to the target board and the
target device’s debug interface signals. (The USB Debug Adapter supports both Silicon Laboratories JTAG and C2
debug interfaces.) Power is provided to the adapter from the USB connection to the PC. The USB Debug Adapter
is capable of providing power to a circuit board via pin 10 of the DEBUG connector. The Si8250 Multi-Phase POL
Target Board is not designed to be powered from this source. Table 8 shows the pin definitions for the DEBUG
ribbon cable connector.
Note: The USB Debug Adapter requires a target system clock of 32 kHz or greater.
With the default settings, the USB Debug Adapter can supply up to 100 mA to a target system.
Figure 16. USB Debug Adapter
Table 8. USB Debug Adapter DEBUG Connector Pin Descriptions
Pin # Description
1, 8 Not Connected
2, 3, 9 GND (Ground)
4 TCK (C2D)
5 TMS
6 TDO
7 TDI (C2CK)
10 USB Power
Power
Run
USB DEBUG ADAPTER
Stop
USB Connector
DEBUG
Ribbon Cable