Data Sheet

4D SYSTEMS µCAM-II
© 2014 4D SYSTEMS Page 6 of 22 www.4dsystems.com.au
µCAM
– II Serial Camera Module
4. Pin Descriptions
5V pin 1 (uCAM-II Supply Voltage Input):
Module supply voltage input pin. This pin must be
connected to a regulated supply voltage.
4.5V to 9.0V DC range, nominal 5.0V.
TX pin 2 (Serial Transmit):
Asynchronous Serial port Transmit pin, TX. Connect
this pin to host Serial Receive (Rx) signal. The host
receives data from the uCAM-II module via this pin.
This pin outputs 3.3V logic.
RX pin 3 (Serial Receive):
Asynchronous Serial port Receive pin, RX. Connect
this pin to host Serial Transmit (Tx) signal. The host
transmits data to the uCAM-II via this pin. This pin
is 3.3V Logic however is 5.0V tolerant.
GND pin 4 (uCAM-II Ground):
Module ground pin. This pin must be connected to
ground.
5. Serial Interface - UART
The uCAM-II has a dedicated hardware UART that
can communicate with a host via this serial port.
This is the main interface used by the host to
communicate with the module to send commands
and receive back data. The primary features are:
• Full-Duplex 8 bit data transmission and
reception through the TX and RX pins.
• Data format: 8 bits, No Parity, 1 Stop bit.
• Auto detect specific Baud rates from 9600
baud up to 921600 baud.
• Selectable Baud rates up to 3686400 bps.
The uCAM-II has low voltage serial TTL levels which
can be directly interfaced to a micro-controller. The
voltage levels could be converted to RS-232 through
an external TTL to RS-232 converter to interface it
to any RS-232 port such as the one on the PC.
Please note that while the baud rate can go up to
3686400 bps, not all RS232/RS485/TTL USB
adaptors/cables can go this high. Please ensure
your hardware can handle the rate you want to use.
Please refer to sections 5.3 and 5.4 for more
information.
5.1. Single Byte Timing
A single byte serial transmission consists of the
start bit, 8-bits of data followed by the stop bit. The
start bit is always 0, while a stop bit is always 1. The
LSB (Least Significant Bit, Bit 0) is sent out first
following the start bit. Figure 3.1 shows a single
byte transmission timing diagram.
Figure 3.1: Single Byte Timing Diagram
5.2. Command Sequence Timing
A single command consists of 6 continuous single
byte serial transmissions. The following Figure 3.2
shows an example of the SYNC (AA0D00000000h)
command.