Rev 1.4

vicorpower.com

Page 9 of 23

05/2015

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BCM380y475x1K2A31

Signal Characteristics

UART SER-IN / SER-OUT Pins

• Universal Asynchronous Receiver/Transmitter (UART) pins.

• The BCM communication version is not intended to be used without a Digital Supervisor.

for more details.

• UART SER-IN pin is internally pulled high using a 1.5 kΩ to 3.3 V.

SIGNAL TYPE

STATE

ATTRIBUTE

SYMBOL

CONDITIONS / NOTES

MIN

TYP

MAX

UNIT

GENERAL I/O

Regular

Operation

Baud Rate

Rate

750

Kbit/s

DIGITAL

INPUT

SER-IN Pin

SER-IN Input Voltage Range

2.3

V

1

V

SER-IN rise time

10% to 90%

400

ns

SER-IN fall time

10% to 90%

25

ns

Pull up to 3.3 V

1.5

kΩ

SER-IN External Capacitance

400

pF

DIGITAL

OUTPUT

SER-OUT Pin

SER-OUT Output Voltage

Range

2.8

V

0.5

V

SER-OUT rise time

10% to 90%

55

ns

SER-OUT fall time

10% to 90%

45

ns

SER-OUT source current

6

mA

SER-OUT output impedance

120

Ω

Enable / Disable Control

• The EN pin is a standard analog I/O configured as an input to an internal µC.

• It is internally pulled high to 3.3 V.

• When held low the BCM internal bias will be disabled and the powertrain will be inactive.

• In an array of BCMs, EN pins should be interconnected to synchronize startup and permit startup into full load conditions.

• Enable / disable command will have no effect if the EN pin is disabled.

SIGNAL TYPE

STATE

ATTRIBUTE

SYMBOL

CONDITIONS / NOTES

MIN

TYP

MAX

UNIT

ANALOG

INPUT

Startup

EN to Powertrain active time

EN held low both conditions satisfied

250

µs

Regular

Operation

EN Voltage Threshold

2.3

V

EN Resistance (Internal)

Internal pull up resistor

1.5

kΩ

EN Disable Threshold

1

V