User's Manual

Silicon Laboratories Finland Oy
Page 9 of 45
PCM signal
Pad number
Pad type
Description
PCM_OUT
25
Output, weak internal pull-down
Synchronous data output
PCM_IN
20
Input, weak internal pull-down
Synchronous data input
PCM_SYNC
22
Bi-directional, weak internal pull-down
Synchronous data sync
PCM_CLK
21
Bi-directional, weak internal pull-down
Synchronous data clock
Table 4: PCM Terminal Descriptions
UART signal
Pad number
Pad type
Description
UART_TX
42
Output, weak internal
pull-up
UART data output, active
high
UART_RTS#
14
Output, weak internal
pull-up
UART request to send,
active low
UART_RX
15
Input, weak internal pull-
down
UART data input, active
high
UART_CTS#
19
Input, weak internal pull-
down
UART clear to send,
active low
Table 5: UART Terminal Descriptions
USB signal
Pad number
Pad type
Description
USB+
17
Bidirectional
USB data line with internal 1.5kohm pull-up
USB-
18
Bidirectional
USB data line
Table 6: USB Terminal Descriptions