SC624A(2007) Ver la hoja de datos (PDF) - Semtech Corporation

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SC624A
(Rev.:2007)

LED Light Management Unit Charge Pump, 4 LEDs, Dual LDOs, and I2C Interface

Semtech Corporation 

SC624A

Electrical Characteristics (continued)

Parameter

I2C Interface (Continued)

I/O Pin Capacitance

I2C Timing

Clock Frequency

SCL Low Period(5)

SCL High Period(5)

Data Hold Time(5)

Data Setup Time(5)

Setup Time for Repeated

START Condition(5)

Hold Time for Repeated

START Condition(5)

Setup Time for STOP

Condition(5)

Bus-Free Time Between

STOP and START(5)

Symbol

C

IN

f

SCL

t

LOW

t

HIGH

t

HD_DAT

t

SU_DAT

t

SU_STA

t

HD_STA

t

SU_STO

t

BUF

Conditions

Min Typ Max Units

10

pF

400 440 kHz

1.3

μs

0.6

μs

0

μs

100

μs

0.6

μs

0.6

μs

0.6

μs

1.3

μs

Interface Start-up Time(5)

t

Bus Start-up Time After EN Pin is Pulled High

EN

1

ms

Notes:

(1) ΔVF is the voltage difference between any two LEDs.

(2) Current matching equals ± [I - I ] / [I + I ].

BL(MAX) BL(MIN

BL(MAX) BL(MIN)

(3) Test voltage is V = 4.0V — a relatively extreme LED voltage — to force a transition during test. Typically V = 3.2V for white LEDs.

OUT

OUT

(4) Dropout is defined as (V -V ) whenV drops 100mV from nominal. Dropout does not apply to LDO2 since it has a maximum output voltage

IN LDO1

LDO1

of 1.8V.

(5) Guaranteed by design

6

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