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BD2808MUV-M 데이터시트(PDF) 4 Page - Rohm |
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BD2808MUV-M 데이터시트(HTML) 4 Page - Rohm |
4 / 34 page 4/30 Datasheet Datasheet BD2808MUV-M TSZ02201-0T3T0C500040-1-2 © 2015 ROHM Co., Ltd. All rights reserved. 4.Jun.2015 Rev.002 www.rohm.com TSZ22111・15・001 Description of Blocks (1) Power Supply Start-up The rise and fall time of a power supply can be from 10us to 1s. Allow at least 0.1ms after VCC exceeds VUVLORise UVLO before commencing communication. Input pin voltages must not exceed VCC or LED flicker may occur at start-up. (2) LED Driver operation Maximum LED current can be set by selecting the value of RISET. The following formula gives the required value of RISET. _ / (Typ) (3) Reset Power on reset occurs when VCC voltage falls below VUVLOFall. Software reset is by command. If reset occurs, all registers are cleared (set to 0) (4) Protection function (XERR output) When thermal shutdown, channel open, or ISET terminal short to ground are detected, the XERR terminal is pulled LOW. All protection functions incorporate noise rejection. The XERR terminal output is low only during detection. (Latch and intentional delay time are not provided.) These signals are also written into a register. The flag returns to “0” only when the register is read. The thermal shutdown operates at 175°C typically with 10°C of hysteresis, release therefore occurring at 165°C typically. All the channels of are turned OFF automatically when thermal shut down operates. When the RISET is out of range RISETSHT, a short to ground function prevents large current from flowing into the LEDs. All channels of LED driver are turned OFF automatically. A Channel OPEN is detected when VLED < VLOD. The individual channel is turned OFF automatically and VLED becomes high impedance. OPEN detection is not active if Brightness is set to 0. The Error flag output pin (XERR pin) is in the same period with the OUT** pin and outputs a flag. The flag stored in register retains the state once detected and is not changed until register is read. VOUT* VXERR Register (LEDOPEN) It returns to "0" when the register is read. VCC Impossible Register access Possible Impossible TrVCC TfVCC TACSS=min 0.1ms VCCmin=3.0V |
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