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AS1105WL Datasheet(PDF) 9 Page - ams AG |
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AS1105WL Datasheet(HTML) 9 Page - ams AG |
9 / 12 page Data Sheet AS1105 Revision 1.32, Oct. 2004 Page 9 of 12 4x8 LED Dot Matrix Driver The example in Figure 3 uses the AS1105 to drive an 4x8 LED dot matrix. The LED columns have common cathode and are connected to the DIG0-3 outputs. The rows are connected to the segment drivers. Each of the 32 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 AS1105 have to be cascaded. Cascading Drivers The AS1105 can be cascaded as well. The DOUT pin must be connected to the DIN pin of the following AS1105. Package Thermal Resistance ( θθθθJA) 20 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 3 4x8 LED Dot Mt i 9.53k VBAT LOA CLK GND GND DIG 0-3 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 4x8 LED Dot Mt i 9.53k VBAT LOA CLK GND GND DIG 0-3 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 3 DOUT 24 Diode Arrangement |
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