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BU2050F-E2 Datenblatt(PDF) 7 Page - Rohm |
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BU2050F-E2 Datenblatt(HTML) 7 Page - Rohm |
7 / 25 page BU2050F,BU2092F,BU2092FV,BU2099FV,BD7851FP,BU2152FS Technical Note 7/24 www.rohm.com 2009.06 - Rev.A © 2009 ROHM Co., Ltd. All rights reserved. 【 BU2050F】 ● Pin descriptions Pin No. Pin Name Function 1 P3 Parallel Data Output 2 P4 3 P5 4 VSS GND 5 P6 Parallel Data Output 6 P7 7 P8 8 DATA Serial Data Input 9 CLK Clock Signal Input 10 STB Strobe Signal Input In case of “L”, the data of shift register outputs. In case of “H”, all parallel outputs and data of latch circuit do not change. 11 CLR Reset Signal Input In case of “L”, the data of latch circuit reset, and all parallel output (P1~P8) can be L. Normally CLR=H 12 P1 Parallel Data output 13 P2 14 VDD Power Supply ● Timing chart Fig. 2 1. After the power is turned on and the voltage is stabilized, STB should be activated, after clocking 8 data bits into the DATA pin. 2. Pn parallel output data of the shift register is set after the 8 th clock by the STB. 3. Since the STB is level latch, data is retained in the “L” section and renewed in the “H” section of the STB. [ Function explanation] ・ A latch circuit has the reset function, which is common in all bits. In case of CLR terminal is “L”, the latch circuit is reset non-synchronously without the other input condition, and all parallel output can be “L”. ・ A serial data inputted from DATA terminal is read in shift register with synchronized rising of clock. In case of STB is “L” (CLR is ”H”), transmit the data which read in the shift register to latch circuit, and outputs from the parallel data output terminal (P1~P8). In case of STB is “H”, all parallel outputs and the data of latch do not change. CLK STB DATA DATA8 DATA7 DATA6 DATA2 DATA1 Pn Previous DATA DATA CLR “L” |
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