Specifications

Bluegiga Technologies Oy
Page 10 of 64
Pin
Number
Pin Name
Pin Type
Description
19
RESET
RESET
Active high reset. If not used, leave floating. When
connected, make sure that the reset is either pulled
high or floating (connected to high impedance)
during boot.
5
AIO0
Configurable I/O
AIO0 and AIO1 can be used to read the voltage
level through the internal ADC (refer to iWRAP
User Guide for details). AIO pins can also be
configured to be used as general digital IO pins
through PS settings. Internal clocks can be routed
out through AIO pins by setting corresponding PS
settings. Note that the AIO pins are powered from
internal 1.5V supply so the maximum voltage level
of the AIO pins is 1.5V.
6
AIO1
7
PIO0
Configurable CMOS I/O
General purpose IO's can be configured with
iWRAP for various functions. Each IO can be
configured individually as output or input with
strong or weak pull-up/-down. Using particular PS
setting GPIO pins can be used to implement WiFi
co-existence signaling between WT32i and a WiFi
radio. Software I2C interface can be implemented
for slow I2C functions such as configuring external
audio codec or display.
8
PIO1
9
PIO2
10
PIO3
13
PIO9
14
PIO10
22
PIO8
23
PIO7
24
PIO6
25
PIO5
26
PIO4
11
USB_D-
I/O
USB data minus
12
USB_D+
I/O
USB data plus with selectable internal 1.5k pull-up
resistor
15
UART_RXD
CMOS Input, weak internal
pull-down
UART data input
16
UART_TXD
CMOS output, tristate,
weak internal pull-up
UART data output
20
UART_NRTS
CMOS output, tristate,
weak internal pull-up
UART request to send, active low
21
UART_NCTS
CMOS Input, weak internal
pull-down
UART clear to send, active low
32
SPI_NCSB
CMOS Input, weak internal
pull-down
SPI chip select
33
SPI_CLK
CMOS Input, weak internal
pull-down
SPI clock