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MAX7221 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX7221 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 16 page Scan-Limit Register The scan-limit register sets how many digits are dis- played, from 1 to 8. They are displayed in a multiplexed manner with a typical display scan rate of 800Hz with 8 digits displayed. If fewer digits are displayed, the scan rate is 8fOSC/N, where N is the number of digits scanned. Since the number of scanned digits affects the display brightness, the scan-limit register should not be used to blank portions of the display (such as leading zero suppression). Table 8 lists the scan-limit register format. Serially Interfaced, 8-Digit LED Display Drivers _______________________________________________________________________________________ 9 Table 7. Intensity Register Format (Address (Hex) = XA) DUTY CYCLE MAX7221 MAX7219 D6 D7 D4 D2 D3 D0 D5 D1 HEX CODE 1/16 (min on) 1/32 (min on) X X X X 0 0 0 0 X0 2/16 3/32 X X X X 0 0 1 0 X1 3/16 5/32 X X X X 0 0 0 1 X2 4/16 7/32 X X X X 0 0 1 1 X3 5/16 9/32 X X X X 1 0 0 0 X4 6/16 11/32 X X X X 1 0 1 0 X5 7/16 13/32 X X X X 1 0 0 1 X6 X 8/16 15/32 X X X X 1 0 1 1 X7 9/16 17/32 X X X X 0 1 0 0 X8 10/16 19/32 X X X X 0 1 1 0 X9 11/16 21/32 X X X X 0 1 0 1 XA 12/16 23/32 X X X X 0 1 1 1 XB 13/16 25/32 X X X X 1 1 0 0 XC 14/16 27/32 X X X X 1 1 1 0 XD 15/16 29/32 X X X X 1 1 0 1 XE 15/16 (max on) 31/32 X X X 1 1 1 1 XF Table 8. Scan-Limit Register Format (Address (Hex) = XB) X X Display digit 0 only* Display digits 0 & 1* X X X D7 SCAN LIMIT X1 X X0 X X X 0 D6 D5 0 1 D4 D3 X X Display digits 0 1 2* Display digits 0 1 2 3 X X X X 0 X3 X D2 HEX CODE X2 0 REGISTER DATA 0 X X X D1 D0 0 1 1 X 0 1 0 X X Display digits 0 1 2 3 4 Display digits 0 1 2 3 4 5 X X X X5 X X4 X X X 1 0 1 X X Display digits 0 1 2 3 4 5 6 Display digits 0 1 2 3 4 5 6 7 X X X X 1 X7 X X6 0 0 X X X 1 1 1 X 1 1 0 *See Scan-Limit Register section for application. |
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