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SC644 Datasheet(PDF) 5 Page - Semtech Corporation |
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SC644 Datasheet(HTML) 5 Page - Semtech Corporation |
5 / 26 page SC644 5 Electrical Characteristics (continued) Parameter Symbol Conditions Min Typ Max Units Digital I/O Electrical Specifications (SPIF) Input High Threshold (9) V IH V IN = 5.5V .6 V Input Low Threshold (9) V IL V IN = 2.9V 0.4 V Input High Current I IH V IN = 5.5V - + µA Input Low Current I IL V IN = 5.5V - + µA SemPulse Electrical Specifications (SPIF) SemPulse Start-up Time(0) t SU ms Bit Pulse Duration (9) t HI 0.75 250 µs Duration Between Bits (9) t LO 0.75 250 µs Hold Time - Address (9) t HOLDA SPIF is held high 500 5000 µs Hold Time - Data (9) t HOLDD SPIF is held high 500 µs Bus Reset Time (9) t BR SPIF is held high 0 ms Shutdown Time() t SD SPIF is pulled low 0 ms Fault Protection Output Short Circuit Current Limit I OUT(SC) OUT pin shorted to GND 300 mA Over-Temperature T OTP Rising threshold 65 °C T HYS Hysteresis 30 °C Charge Pump Over-Voltage Protection V OVP OUT pin open circuit, V OUT = VOVP 5.7 6.0 V Under Voltage Lockout V UVLO-OFF Increasing V IN 2.7 V V UVLO-HYS Hysteresis 800 mV 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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