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AS1100WL Datasheet(PDF) 8 Page - ams AG |
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AS1100WL Datasheet(HTML) 8 Page - ams AG |
8 / 17 page www.austriamicrosystems.com/LED-Driver-ICs/AS1100 Revision 1.37 7 - 16 AS1100 Datasheet - D e t a i l e d D e s c r i p t i o n 8.5 Decode-Mode Register In the AS1100 a BCD decoder is included. Every digit can be selected via register 09h to be decoded. The BCD code consists of the numbers 0- 9, E,H, L,P and -. In register 09h a logic high enables the decoder for the appropriate digit. In case that the decoder is bypassed (logic low) the data Bits D7-D0 correspond to the segment lines of the AS1100. In Table 7 some possible settings for register 09h are shown. Bit D7, which corresponds to the decimal point, is not affected by the settings of the decoder. Logic high means that the decimal point is displayed. In Table 8 the font of the Code B decoder is shown. In Table 9 the correspondence of the register to the appropriate segments of a 7 segment display is shown (see Figure 6). 8.6 Intensity Control and Interdigit Blanking Brightness of the display can be controlled in an analog way by changing the external resistor (RSET). The current, which flows between VDD and ISET, defines the current that flows through the LEDs. The LED current is 100 times the ISET current. The minimum value of RSET should be 9.53k Ω, which corresponds to 40mA segment current. The brightness of the display can also be controlled digitally via register 0Ah. The brightness can be programmed in 16 steps and is shown in Table 10. An internal pulse width modulator controls the intensity of the display. 8.7 Scan-Limit Register The scan limit register 0Bh selects the number of digits displayed. When all 8 digits are displayed the update frequency is typically 800Hz. If the number of digits displayed is reduced, the update frequency is reduced as well. The frequency can be calculated using 8fOSC/N, where N is the number of digits. Since the number of displayed digits influences the brightness, the resistor RSET should be adjusted accordingly. The Table 12 shows the maximum allowed current, when fewer than 4 digits are used. To avoid differences in brightness the scan limit register should not be used to blank portions of the display (leading zeros). Table 5. Register Address Map Register Address Hex Code D15-D12 D11 D10 D9 D8 No-Op X 0 0 0 0 0xX0 Digit 0 X 0 0 0 1 0xX1 Digit 1 X 0 0 1 0 0xX2 Digit 2 X 0 0 1 1 0xX3 Digit 3 X 0 1 0 0 0xX4 Digit 4 X 0 1 0 1 0xX5 Digit 5 X 0 1 1 0 0xX6 Digit 6 X 0 1 1 1 0xX7 Digit 7 X 1 0 0 0 0xX8 Decode Mode X 1 0 0 1 0xX9 Intensity X 1 0 1 0 0xXA Scan Limit X 1 0 1 1 0xXB Shutdown X 1 1 0 0 0xXC Not used X 1 1 0 1 0xXD Reset and ext. Clock X 1 1 1 0 0xXE Display Test X 1 1 1 1 0xXF Table 6. Shutdown Register Format (address (hex) = 0xXC Mode Address Code (Hex) Register Data D7 D6 D5 D4 D3 D2 D1 D0 Shutdown Mode 0xXC X X X X X X X 0 Normal Operation 0xXC X X X X X X X 1 |
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