SC644 datasheet(5/26 Pages) SEMTECH

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SC644

Electrical Characteristics (continued)

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Digital I/O Electrical Specifications (SPIF)

Input High Threshold (9)

IN = 5.5V

Input Low Threshold (9)

IN = 2.9V

0.4

Input High Current

IN = 5.5V

µA

Input Low Current

IN = 5.5V

µA

SemPulse Electrical Specifications (SPIF)

SemPulse Start-up Time(0)

Bit Pulse Duration (9)

0.75

250

µs

Duration Between Bits (9)

0.75

250

µs

Hold Time - Address (9)

HOLDA

SPIF is held high

500

5000

µs

Hold Time - Data (9)

HOLDD

SPIF is held high

500

µs

Bus Reset Time (9)

SPIF is held high

Shutdown Time()

SPIF is pulled low

Fault Protection

Output Short Circuit Current Limit

OUT(SC)

OUT pin shorted to GND

300

Over-Temperature

OTP

Rising threshold

°C

HYS

Hysteresis

°C

Charge Pump

Over-Voltage Protection

OVP

OUT pin open circuit, V

OUT = VOVP

5.7

6.0

Under Voltage Lockout

UVLO-OFF

Increasing V

2.7

UVLO-HYS

Hysteresis

800

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

(3) Subscript for all backlights (BLn), n = , 2, 3, 4, 5, and 6. Subscripting for all LDOs (LDOn), n = , 2, 3, 4.

(4) Current matching is defined as ± [I

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

(5) Test voltage is V

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

(6) Subscript m = , 3, and 4 and applies only to LDO, LDO3, and LDO4.

(7) Dropoutisdefinedas(V

IN- VLDOm) when VLDOm drops 00mV from nominal. Dropout does not apply to LDO2 since it has a maximum output voltage

of .8V.

(8) X5R or better “temperature stable” MLCC capacitor.

(9) The source driver used to provide the SemPulse output must meet these limits.

(0) The SemPulse start-up time is the minimum time that the SPIF pin must be held high to enable the part before commencing

communication.

() 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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