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AS1106PE Datasheet(PDF) 11 Page - ams AG |
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AS1106PE Datasheet(HTML) 11 Page - ams AG |
11 / 20 page www.austriamicrosystems.com Revision 2.2 11 - 20 AS1106, AS1107 austriamicrosystems Data Sheet Digit- and Control-Registers 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 (15/16 to 1/16 for the AS1107) 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 8 digits are to be displayed, the update frequency is typically 800Hz. 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 15 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 13. Intensity Register Format (Address (HEX) = 0xXA)) Duty Cycle HEX Code Register Data AS1106 AS1107 D7 D6 D5 D4 D3 D2 D1 D0 1/32 (min on) 1/16 (min on) 0xX0 XXXX 0000 3/32 2/16 0xX1 XXXX 0001 5/32 3/16 0xX2 XXXX 0010 7/32 4/16 0xX3 XXXX 0011 9/32 5/16 0xX4 XXXX 0100 11/32 6/16 0xX5 XXXX 0101 13/32 7/16 0xX6 XXXX 0110 15/32 8/16 0xX7 XXXX 0111 17/32 9/16 0xX8 XXXX 1000 19/32 10/16 0xX9 XXXX 1001 21/32 11/16 0xXA XXXX 1010 23/32 12/16 0xXB XXXX 1011 25/32 13/16 0xXC XXXX 1100 27/32 14/16 0xXD XXXX 1101 29/32 15/16 0xXE XXXX 1110 31/32 (max on) 15/16 (max on) 0xXF XXXX 1111 Table 14. 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 15) 0xX0 XXXX X 0 0 0 Display digits 0:1 (see Table 15) 0xX1 XXXX X 0 0 1 Display digits 0:2 (see Table 15) 0xX2 XXXX X 0 1 0 Display digits 0:3 0xX3 XXXX X 0 1 1 Display digits 0:4 0xX4 XXXX X 1 0 0 Display digits 0:5 0xX5 XXXX X 1 0 1 Display digits 0:6 0xX6 XXXX X 1 1 0 Display digits 0:7 0xX7 XXXX X 1 1 1 Table 15. 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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