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AS1100PE-Z Datasheet(PDF) 9 Page - ams AG |
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AS1100PE-Z Datasheet(HTML) 9 Page - ams AG |
9 / 12 page Data Sheet AS1100 Revision 1.32, Oct. 2004 Page 9 of 12 8x8 LED Dot Matrix Driver The example in Figure 3 uses the AS1100 to drive an 8x8 LED dot matrix. The LED columns have common cathode and are connected to the DIG0-7 outputs. The rows are connected to the segment drivers. Each of the 64 LEDs can be addressed separately. The columns are selected via the digits as shown in Table 2. The decode mode register (0xX9) has to be programmed to ‘00000000’ as stated in Table 4. The single LEDs in a column can be addressed as stated in Table 6, where D0 corresponds to segment G and d/ to segment DP. For a multiple digit dot matrix several AS1100 have to be cascaded. Cascading Drivers The AS1100 can be cascaded as well. The DOUT pin must be connected to the DIN pin of the following AS1100. Package Thermal Resistance ( θθθθJA) 24 Narrow DIP +75°C/W 24 Wide SO +85°C/W Maximum Junction Temperature (TJ) = +150°C Maximum Ambient Temperature (TA) = +85°C Table 13: Package thermal resistance data Figure 3: Application example as LED dot matrix driver µP DIG 7 8x8 LED Dot Mt i 9.53k VBAT LOA CLK GND GND DIG 0- SEG A-G SEP DP VDD 4 9 1 12 1 18 19 ISET DIN DIG 0 SEG B SEG A SEG DP SEG E SEG D SEG C SEG F SEG G 8x8 LED Dot Mt i 9.53k VBAT LOA CLK GND GND DIG 0- SEG A-G SEP DP VDD 4 9 1 12 1 18 19 ISET DIN DIG 0 SEG B SEG A SEG DP SEG E SEG D SEG C SEG F SEG G DIG 7 DOUT 24 Diode Arrangement |
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