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TAU-0640-00-10, version 110
June 2011
5-1
5
Overview of the Electrical Interface
5.1 Input Power
The Tau 640 camera operates from DC power per the specifications given below. It is common
in simple operational scenarios to use an inexpensive wall-powered adapter. The Tau VPC
module makes this easy by providing a USB connection.
The camera operating in a steady-state condition consumes around 1W of power. During
startup there is an inrush current of up to 1 A (at 5 V) for 1 ms. Cameras equipped with the
compact shutter will draw 2.75 W (550 mA at 5 V) for 200 ms during the flat-field operation
which occurs during startup and periodically thereafter. Typical start-up times are 3 to 4
seconds.
Caution!
The Tau 640 camera has been tested and found to meet radiated emissions specifications of
FCC CFR Title 47 Part 15 Subpart B, and EN 61000-6-3 (CISPR-22 limits equivalent to Class
B) when properly shielded and grounded. The less stringent Class A requirements are met with
the back cover on. It is the responsibility of the systems integrator to verify EMI/EMC
compliance at the system level.
5.2 Hirose 50-Pin Connector
In the Tau 640 camera’s simplest form (no accessories attached), one connector provides the
electrical interface. This connector is a 50-pin Hirose board-to-board style connector, per
Hirose Part Number: DF12-50DS-0.5V(86). Hirose offers a variety of mating connectors
including their SFM(L), SMT, and SFSD style products. Designers and integrators should
provide electrostatic discharge (ESD) and over voltage protection for Tau 640 cameras using
digital data channels because the digital signals on the 50-pin Hirose connector are routed
directly to the FPGA. The primary Tau 640 connector is shown in Figure 5-1.
Figure 5-1: 50-Pin Hirose Connector Interface—DF12-50DS-0.5V(86)
Reversing the polarity of the input power will damage the camera’s internal power supply.
This damage will not be covered under the camera warranty.
Table 5-1: Input Power Requirements
Parameter
Baseline
Value
Comment
Minimum voltage
4.4 V
Absolute minimum is 4.4 V
Maximum voltage
6.0 V
Absolute maximum is 6 V
Nominal Load Power
~1.0 W
Room temperature
Hirose connector
See Figure 5-2.