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MAX7221EWG Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX7221EWG Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 16 page Intensity Control and Interdigit Blanking The MAX7219/MAX7221 allow display brightness to be controlled with an external resistor (RSET) connected between V+ and ISET. The peak current sourced from the segment drivers is nominally 100 times the current entering ISET. This resistor can either be fixed or vari- able to allow brightness adjustment from the front panel. Its minimum value should be 9.53 Ω, which typi- cally sets the segment current at 40mA. Display bright- ness can also be controlled digitally by using the intensity register. Digital control of display brightness is provided by an internal pulse-width modulator, which is controlled by the lower nibble of the intensity 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 (15/16 to 1/16 on MAX7221). Table 7 lists the intensity register format. The minimum interdigit blank- ing time is set to 1/32 of a cycle. Serially Interfaced, 8-Digit LED Display Drivers 8 _______________________________________________________________________________________ Table 5. Code B Font Table 6. No-Decode Mode Data Bits and Corresponding Segment Lines 0 0 X 0 0 0 1 1 1 1 1 1 D7* REGISTER DATA 0 7-SEGMENT CHARACTER D3 D6–D4 D1 D2 DP* D0 B A D C F E G 1 0 X 0 0 1 1 0 ON SEGMENTS = 1 0 1 0 0 0 2 0 X 1 0 0 1 1 1 0 0 1 1 3 0 X 1 0 1 1 1 1 1 0 0 1 4 0 X 0 1 0 1 0 0 1 1 0 1 5 0 X 0 1 1 0 1 1 1 1 0 1 6 0 X 1 1 0 0 1 1 1 1 1 1 7 0 X 1 1 1 1 1 0 1 0 0 0 8 1 X 0 0 0 1 1 1 1 1 1 1 9 1 X 0 0 1 1 1 1 1 1 0 1 — 1 X 1 0 0 0 0 0 0 0 0 1 E 1 X 1 0 1 0 1 1 0 1 1 1 H 1 X 0 1 0 1 0 0 1 1 1 1 L 1 X 0 1 1 0 0 1 0 1 1 0 P 1 X 1 1 0 1 1 0 0 1 1 1 blank 1 X 1 1 1 0 0 0 0 0 0 0 *The decimal point is set by bit D7 = 1 F E A G D C B STANDARD 7-SEGMENT LED DP A Corresponding Segment Line D6 DP C D4 B D5 E D2 D G REGISTER DATA D0 F D1 D3 D7 |
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