BCM352x110y300B00
7.0 USING THE CONTROL SIGNALS PC, TM
Primary Control (PC) pin can be used to accomplish the
following functions:
• Logic enable and disable for module: Once Ton1 time has
been satisfied, a PC voltage greater than VPC_EN will cause
the module to start. Bringing PC lower than VPC_DIS will
cause the module to enter standby.
• Auxiliary voltage source: Once enabled in regular
operational conditions (no fault), each BCM module
PC provides a regulated 5 V, 3.5 mA voltage source.
• Synchronized start up: In an array of parallel modules, PC
pins should be connected to synchronize start up across
units. This permits the maximum load and capacitance
to scale by the number of paralleled modules.
• Output disable: PC pin can be actively pulled down in order
to disable the module. Pull down impedance shall be lower
than 60 Ω.
• Fault detection flag: The PC 5 V voltage source is internally
turned off as soon as a fault is detected.
• Note that PC can not sink significant current during a fault
condition. The PC pin of a faulted module will not cause
interconnected PC pins of other modules to be disabled.
Temperature Monitor (TM) pin provides a voltage
proportional to the absolute temperature of the converter
control IC.
It can be used to accomplish the following functions:
• Monitor the control IC temperature: The temperature in
Kelvin is equal to the voltage on the TM pin scaled
by 100. (i.e. 3.0 V = 300 K = 27 ºC). If a heat sink is applied,
TM can be used to protect the system thermally.
• Fault detection flag: The TM voltage source is internally
turned off as soon as a fault is detected. For system
monitoring purposes microcontroller interface faults are
detected on falling edges of TM signal.
BCM® Bus Converter
Page 10 of 19
Rev 1.1
07/2015
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