8 - B i t U S B D e b u g A d a p t e r
2
Rev. 0.3
3. Pinout Specification
The 8-Bit USB Debug Adapter supports both Silicon Laboratories JTAG and C2 debug interfaces, and the adapter
is powered from the USB connection to the PC. The UDA is also capable of providing power to the target device or
other circuitry via pin 10 of the connector. Table 1 shows the pin definitions for the UDA keyed connector. The part
number for the matching shrouded and keyed connector for a PCB is 2510-6002UB from 3M.
The USB Debug Adapter can automatically change the communication voltage level based on the level detected
on pin 7 of the connector. As a result, this pin should be pulled high with a strong pull-up (~1 k
Ω
) for noise immunity
purposes and not pulled down to ground.
Notes:
• 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 2. 8-Bit USB Debug Adapter Connector
Table 1. USB Debug Adapter Debug Connector Pin Descriptions
Pin #
Description
Details
1
Not Connected
2
GND (Ground)
3
GND (Ground)
4
TCK / C2D
JTAG TCK or C2 Data
5
TMS / C2CK pin share
JTAG TMS or C2 Clock pin sharing
6
TDO / C2D pin share
JTAG TDO or C2 Data pin sharing
7
TDI / C2CK
JTAG TDI or C2 Clock signal
This pin is used by the UDA to sense and set
the logic voltage level. This pin should never
have a pull-down to ground.
8
Not Connected
9
GND (Ground)
10
USB Power
5 V power from the UDA
1
2
3
4
9
8
7
6
5
10
