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MAX6959AAEE Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX6959AAEE Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 19 page The digit registers and segments register use 1 bit to set the state of one segment. Each bit is high to turn a segment on, or low to turn it off (Table 6). Decode-Mode Register The decode-mode register sets hexadecimal code (0–9, A–F) or no-decode operation for each digit. Each bit in the register corresponds to one digit. Logic high selects hexadecimal decoding while logic low bypass- es the decoder. Digits can be set for decode or no decode in any combination. Bit assignment and exam- ples of the decode mode control register format are shown in Table 7. In hexadecimal code-decode mode, the decoder looks only at the lower nibble of the data in the digit register (D3–D0), disregarding bits D7–D4. Table 7 lists the hexa- decimal code font. When no decode is selected, data bits D7–D0 correspond to the segment lines of the MAX6958/MAX6959. Table 8 shows the one-to-one pair- ing of each data bit to the appropriate segment line. Initial Power-Up On initial power-up, all control registers are reset, the display is blanked, and the MAX6958/MAX6959 enter shutdown mode (Table 9). At power-up, the MAX6958/ MAX6959 are initially set to scan four digits, do not decode data in the digit registers or scan key switches (MAX6959 only), and the intensity register is set to a low value (4/64 intensity). 2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan 10 ______________________________________________________________________________________ REGISTER DATA DIGIT/SEGMENT REGISTER ADDRESS CODE (HEX) D7 D6 D5 D4 D3 D2 D1 D0 Digit 0 0x20 X SEG a SEG b SEG c SEG d SEG e SEG f SEG g Digit 1 0x21 X SEG a SEG b SEG c SEG d SEG e SEG f SEG g Digit 2 0x22 X SEG a SEG b SEG c SEG d SEG e SEG f SEG g Digit 3 0x23 X SEG a SEG b SEG c SEG d SEG e SEG f SEG g Segments 0x24 SEG 7 SEG 6 SEG 5 SEG 4 SEG 3 SEG 2 SEG 1 SEG 0 Table 5. No-Decode Mode Data Bits and Corresponding Segment Lines REGISTER BIT SEGMENT BEHAVIOR 0 Segment off 1 Segment on Table 6. No-Decode Mode Data Bits and Corresponding Segment Lines REGISTER DATA DECODE MODE ADDRESS CODE (HEX) D7 D6 D5 D4 D3 D2 D1 D0 HEX CODE Bit assignment for each digit 0x01 XXXX Digit 3 Digit 2 Digit 1 Digit 0 — No decode for digits 3–0 0x01 XXXX 0 0 0 0 0xX0 Hexadecimal decode for digit 0; no decode for digits 3–1 0x01 XXXX 0 0 0 1 0xX1 —— — — — — — — — — — Hexadecimal decode for digits 2–0; no decode for digit 3 0x01 XXXX 0 1 1 1 0xX7 Hexadecimal decode for digit 3; no decode for digits 2–0 0x01 XXXX 1 0 0 0 0xX8 —— — — — — — — — — — Hexadecimal decode for digits 3–0 0x01 XXXX 1 1 1 1 0xXF Table 7. Decode-Mode Register Examples |
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