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COP472N-3 Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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COP472N-3 Datasheet(HTML) 5 Page - National Semiconductor (TI) |
5 / 8 page Functional Description The COP472-3 drives 36 bits of display information orga- nized as twelve segments and three backplanes The COP472-3 requires 40 information bits 36 data and 4 con- trol The function of each control bit is described below Display information format is a function of the LCD intercon- nections A typical segmentbackplane configuration is illus- trated in Figure 5 with this configuration the COP472-3 will drive 4 digits of 9 segments To adapt the COP472-3 to any LCD display configuration the segmentbackplane multiplex scheme is illustrated in Table I Two or more COP472-3 chips can be cascaded to drive additional segments There is no limit to the number of COP472-3’s that can be used as long as the output loading capacitance does not exceed specification TABLE I COP472-3 SegmentBackplane Multiplex Scheme Bit Number Segment Data to Backplane Numeric Display 1 SA1 BPC SH 2 SB1 BPB SG 3 SC1 BPA SF 4 SC1 BPB SE Digit 1 5 SB1 BPC SD 6 SA1 BPB SC 7 SA1 BPA SB 8 SB1 BPA SA 9 SA2 BPC SH 10 SB2 BPB SG 11 SC2 BPA SF 12 SC2 BPB SE Digit 2 13 SB2 BPC SD 14 SA2 BPB SC 15 SA2 BPA SB 16 SB2 BPA SA 17 SA3 BPC SH 18 SB3 BPB SG 19 SC3 BPA SF 20 SC3 BPB SE Digit 3 21 SB3 BPC SD 22 SA3 BPB SC 23 SA3 BPA SB 24 SB3 BPA SA 25 SA4 BPC SH 26 SB4 BPB SG 27 SC4 BPA SF 28 SC4 BPB SE Digit 4 29 SB4 BPC SD 30 SA4 BPB SC 31 SA4 BPA SB 32 SB4 BPA SA 33 SC1 BPC SPA Digit 1 34 SC2 BPC SP2 Digit 2 35 SC3 BPC SP3 Digit 3 36 SC4 BPC SP4 Digit 4 37 not used 38 Q6 39 Q7 40 SYNC SEGMENT DATA BITS Data is loaded in serially in sets of eight bits Each set of segment data is in the following format SA SB SC SD SE SF SG SH Data is shifted into an eight bit shift register The first bit of the data is for segment H digit 1 The eighth bit is segment A digit 1 A set of eight bits is shifted in and then loaded into the digit one latches The second set of 8 bits is loaded into digit two latches The third set into digit three latches and the fourth set is loaded into digit four latches CONTROL BITS The fifth set of 8 data bits contains special segment data and control data in the following format SYNC Q7 Q6 X SP4 SP3 SP2 SP1 The first four bits shifted in contain the special character segment data The fifth bit is not used The sixth and sev- enth bits program the COP472-3 as a stand alone LCD driv- er or as a master or slave for cascading COP472-3’s BPC of the master is connected to BPA of each slave The fol- lowing table summarizes the function of bits six and seven Q7 Q6 Function BPC Output BPA Output 1 1 Slave Backplane Oscillator Output Input 0 1 Stand Alone Backplane Backplane Output Output 1 0 Not Used Internal Oscillator Osc Output Input 0 0 Master Internal Backplane Osc Output Output The eighth bit is used to synchronize two COP472-3’s to drive an 8 -digit display http www nationalcom 5 |
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