ZIO, Motherboard User Manual
Rev. 2.0
Zilogic Systems
Page 4
can be used as chip selects for four other devices. The signals are pulled
up to 5V, through a 10K resistor.
GND
(Pin 10)
This is the ground signal. All other signals are referenced to the this
signal.
2.
UART-I2C
Pinmap
The
UART-I2C
header is terminated with serial communication signals, I²C signals and power
supply. Add-on boards, with different functionalities, can be connected through this header.
Table 2.2.
UART-I2C
Header
Pin #
Header Signal
Signal Type
1
VCC
+5V
2
RXD
TTL In
1
3
TXD
TTL Out
4
SCL
OC
2
5
SDA
OC
2
6
DIO0
OC
2
7
DIO1
OC
2
8
DIO2
OC
2
9
DIO3
OC
2
10
GND
Ground
1
5V tolerant input
2
Open collector, with 5V pull-up
VCC
(Pin 1)
This is the +5V power supply for the external devices. The supply
has a total current limit of 200mA when powered through USB.
RXD
(Pin 2)
This is receive line of serial IO.
TXD
(Pin 3)
This is transmit line of serial IO.
SCL
,
SDA
(Pin 4, 5)
These are I²C bus signals(clock, data), and can be used to connect
I²C devices. The signals are pulled up to 5V, through a 4.7K
resistor.
DIO
(Pin 6-9)
These are digital input/output signals. These pins can be used
for hand-shake and flow control signals like
DTR
,
RTS
,
CTS
, etc.
The signals are pulled up to 5V, through a 10K resistor.
GND
(Pin 10)
This is the ground signal. All other signals are referenced to this
signal.
3.
DIO
Pinmap
The
DIO
header is terminated with GPIO signals, along with power supply. Add-on boards, with
different functionalities, can be connected through this header.
