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AS1108 Datasheet(PDF) 11 Page - ams AG |
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AS1108 Datasheet(HTML) 11 Page - ams AG |
11 / 19 page www.austriamicrosystems.com Revision 2.11 11 - 19 AS1108 Data Sheet - D e t a i l e d D e s c r i p t i o n Intensity Control Register (0xXA) The brightness of the display can be controlled by digital means using the Intensity Control Register and by analog means using RSET (see Selecting RSET Resistor Value and Using External Drivers on page 13). Display brightness is controlled by an integrated pulse-width modulator which is controlled by the lower-nibble of the Intensity Control Register. The modulator scales the average segment-current in 16 steps from a maximum of 31/32 down to 1/32 of the peak current set by RSET. Scan-Limit Register (0x0B) The Scan-Limit Register controls which of the digits are to be displayed. When all 4 digits are to be displayed, the update frequency is typically 1600Hz. If the number of digits displayed is reduced, the update frequency is increased. The frequency can be calculated using 8fOSC/N, where N is the number of digits. Since the number of displayed digits influences the brightness, RSET should be adjusted accordingly. Table 16 lists the maximum allowed current when fewer than 4 digits are used. Note: To avoid differences in brightness this register should not be used to blank parts of the display (leading zeros). Table 14. Intensity Register Format (Address (HEX) = 0xXA)) Duty Cycle HEX Code Register Data AS1108 D7 D6 D5 D4 D3 D2 D1 D0 1/32 (min on) 0xX0 X X X X 0 0 0 0 3/32 0xX1 X X X X 0 0 0 1 5/32 0xX2 X X X X 0 0 1 0 7/32 0xX3 X X X X 0 0 1 1 9/32 0xX4 X X X X 0 1 0 0 11/32 0xX5 X X X X 01 01 13/32 0xX6 X X X X 0 1 1 0 15/32 0xX7 X X X X 0 1 1 1 17/32 0xX8 X X X X 1 0 0 0 19/32 0xX9 X X X X 1 0 0 1 21/32 0xXA X X X X 1 0 1 0 23/32 0xXB X X X X 1 0 1 1 25/32 0xXC X X X X 1 1 0 0 27/32 0xXD X X X X 1 1 0 1 29/32 0xXE X X X X 1 1 1 0 31/32 (max on) 0xXF X X X X 1 1 1 1 Table 15. Scan-Limit Register Format (Address (HEX) = 0xXB)) Scan Limit HEX Code Register Data D7 D6 D5 D4 D3 D2 D1 D0 Display digit 0 only (see Table 16) 0xX0 XXXX X 0 0 0 Display digits 0:1 (see Table 16) 0xX1 XXXX X 0 0 1 Display digits 0:2 (see Table 16) 0xX2 XXXX X 0 1 0 Display digits 0:3 0xX3 XXXX X 0 1 1 Table 16. Maximum Segment Current for 1-, 2-, or 3-Digit Displays Number of Digits Displayed Maximum Segment Current (mA) 110 220 330 |
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