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MC14489P Datasheet(PDF) 10 Page - Motorola, Inc |
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MC14489P Datasheet(HTML) 10 Page - Motorola, Inc |
10 / 20 page MC14489 MOTOROLA 10 (a) Configuration Registers C7 C6 C5 C4 C3 C2 C1 C0 1ST BYTE SHIFTED IN 2ND BYTE 3RD BYTE 4TH BYTE CONFIGURATION REGISTER OF DEVICE 2 IN FIGURE 11 CONFIGURATION REGISTER OF DEVICE 1 IN FIGURE 11 DON’T CARE DON’T CARE (b) Display Registers Figure 8. Bit Stream Formats for Two Devices Cascaded D23 D22 D21 D20 D19 D18 D17 D16 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 1ST BYTE SHIFTED IN 2ND BYTE 3RD BYTE 4TH BYTE h BITS AND DIMMER BIT h BITS AND DIMMER BIT 5TH BYTE BANK 5 NIBBLE BANK 4 NIBBLE BANK 3 NIBBLE BANK 2 NIBBLE BANK 1 NIBBLE BANK 5 NIBBLE BANK 4 NIBBLE BANK 3 NIBBLE BANK 2 NIBBLE BANK 1 NIBBLE 6TH BYTE DISPLAY REGISTER OF DEVICE 2 IN FIGURE 11 DISPLAY REGISTER OF DEVICE 1 IN FIGURE 11 NOTE: ENABLE (which initially must be inactive high) is kept active–low during the entire 4–byte configuration transfer or 6–byte display transfer. When ENABLE is brought back high, either a 4– or 6–byte transfer occurs in the cascaded devices, depending on the number of bytes in the transfer. Figure 9. a through h Nominal Current per Output versus Rx 35 30 25 20 15 10 5 400 800 1.2 k 2.0 k 2.4 k 2.8 k 3.2 k 3.6 k 4.0 k 1.6 k 5 V SUPPLY BIT D23 = HIGH (BRIGHTEN LEDs) WITH D23 = LOW, iOH IS CUT BY ∼50%. Rx, EXTERNAL RESISTOR ( Ω) NOTE: Drive current tolerance is approximately ± 15%. |
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