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OEM Integration Guide
Product Manuals - http://www.vescent.com/manuals/
bus can only distribute a maximum of 10 amps on the 5V_A rail. If three
temperature
controllers were chosen as daughter modules, and all the TEC current limits were left at maximum,
the three modules could potentially draw 12 amps. This would exceed the capacity of the power bus
and master controller. The master controller provide over-current protection, so it would shut down
power to the daughter modules and enter a fault condition if 12 amps were attempted to be drawn
from the 5V_A rail.
When choosing how many and which type of each daughter
module a master controller can support, the expected
current draw of all daughter modules must not exceed the
maximum power consumption specification for the master
controller.
Power Sequencing
Power sequencing is not required if using the
as it handles sequencing and startup
commands automatically.
The ICE power bus that distributes power to all daughter modules must have each voltage rail
properly sequenced when turning power on and off. The
automatically
takes care of this power sequencing to protect daughter modules. If power is being applied directly to
the power bus by the OEM integrator, the power sequencing outlined in this section must strictly be
followed to prevent damage to the daughter modules. Between each step, an appropriate amount of
settling-time should given for the previous power rail to settle (fully turn on or off) before proceeding
to the next step. This is generally at least 100 milliseconds for most power supplies and voltage
regulators. The I
2
C broadcast commands are detailed in the
here to show the timing of when the commands should be sent. These commands are required to be
sent for safe shutdown and proper operation of ICE daughter modules.
The I
2
C System Ready and Shutdown commands are required
to be sent for safe shutdown and proper operation of ICE
daughter modules.
A delay of 100 ms (unless otherwise noted) is a generally
sufficient time to wait between each power sequence step to
allow the power supply to settle.
