SC657 datasheet(5/22 Pages) SEMTECH

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Electrical Characteristics (continued)

SC657

Parameter

Symbol

Conditions

Min

Typ

Max

Units

SemPulse Interface

Input High Threshold

IN = 5.5V

Input Low Threshold

IN = 2.9V

0.4

Input High Current

IN = 5.5V

µA

Input Low Current

IN = 5.5V

µA

Start up Time(5)

Only required when leaving shutdown mode

Bit Pulse Duration(6)

0.75

250

µs

Duration Between Pulses(6)

0.75

250

µs

Hold Time - Address(6)

HOLDA

Software limit — SPIF must be held high for this

amount of time to latch the data

550

5000

µs

Hold Time - Data(6)

HOLDD

Software limit — SPIF must be held high for this

amount of time to latch the address

550

µs

Bus Reset Time (6)

Software Limit — SPIF must be held high for this

amount of time to force a bus system reset

Shutdown Time (7)

Software Limit — SPIF must be held low for this

amount of time to disable device

Notes:

() Capacitors are MLCC of X5R type. Production tested with higher value capacitors than the application requires

(2) SPIF is high for more than 0ms to place serial bus in standby mode

(3) Current matching is defined as ± [I

BL(MAX) - IBL(MIN] / [IBL(MAX) + IBL(MIN)].

(4) Test voltage is V

OUT = 4.2V — a relatively extreme LED voltage — to force a transition during test. Typically VF = 3.2V for white LEDs.

(5) The SemPulse start-up time is the minimum time that the SPIF pin must be held high to enable the part before starting communication.

(6) The source driver used to provide the SemPulse Output must meet these limits.

(7) The SemPulse shutdown time is the minimum time that the SPIF pin must be pulled low to shut the part down.

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