6. Power up
Apply power on VDD and VDDLED. The sequence does not matter. The device notifies the power-up with a short red LED flash (Error
LED). It is ready to operate as soon as the greenstatus LED is on. Refer to Figure 4.
Error cases:
■
Red error LED flashing: TOFCOS not correctly downloaded. Download the TOFCOS with the GUI of ESPROS_TOFCAM635 or with the
bootloader (refer to Chapter 12.4 and 15).
■
Red error LED stays on: Error during boot-up. Switch off/on power again.
■
If the error remains, contact your sales responsible.
Make sure that the power supply has the correct voltage and is capable to deliver the required current. Please note that there is a
surge current draw by the camera during power up. Also during image acquisition, pulse currents are drawn by the camera. A
voltage drop due to surge currents shall be avoided by placing a big enough block capacitor nearby the power supply terminals.
7. Communication interface
7.1. Hardware interface
Communication takes place over a standard TTL UART interface. The communication protocol is as follows:
Parameter
Value
Unit
Comment
Baud rate
10
Mbit/s
1 bit = 0.1 µs
Start bits
1
Bit
low active
Data
8
Bit
Stop bits
1
Bit
high active
Parity
No
Voltage level LVTTL
3.3
V
Table 4: UART configuration
Figure 7: UART frame format
7.2. Software interface
The UART operates in a master-slave mode with the application as the master and the camera as the slave. A request is initiated with a
command by the master. The camera as the slave returns the answer to the request after the processing time t
PROC
. The camera does not
accept commands during the processing t
PROC
and the communication t
COM_TX
. A next command can be issued earliest after finishing Data
Out.
Figure 8: Command and answer sequence
© 2019 ESPROS Photonics Corporation
Characteristics subject to change without notice
9 / 39
Installation_and_Operation_Manual_TOF>cam_635-V0.21
S
T
A
R
T
S
T
O
P
Data 8 bit, LSB first
3.3 V
GND
No acceptance of commands
Data Out
Processing
Application:
Command on Rx
Request
processing
t
COM
t
PROC
Camera:
Data Out on Tx
t
COM_TX