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ICM7212 Datasheet(PDF) 7 Page - Intersil Corporation |
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ICM7212 Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 12 page 9-12 Input Definitions In this table, VDD and VSS are considered to be normal operating input logic levels. Actual input low and high levels are specified under Operating Characteristics. For lowest power consumption, input signals should swing over the full supply. INPUT TERMINAL CONDITIONS FUNCTION B0 27 VDD = Logical One VSS = Logical Zero Ones (Least Significant) Data Input Bits B1 28 VDD = Logical One VSS = Logical Zero Twos B2 29 VDD = Logical One VSS = Logical Zero Fours B3 30 VDD = Logical One VSS = Logical Zero Eights (Most Significant) OSC (LCD Devices Only) 36 Floating or with External Capacitor to VDD Oscillator Input VSS Disables BP output devices, allowing segments to be synchronized to an external signal input at the BP terminal (Pin 5). ICM7211 Multiplexed-Binary Input Configuration INPUT TERMINAL CONDITIONS FUNCTION D1 31 VDD = Inactive VSS = Active D1 Digit Select (Least Significant) D2 32 D2 Digit Select D3 33 D3 Digit Select D4 34 D4 Digit Select (Most Significant) ICM7211M/ICM7212M Microprocessor Interface Input Configuration INPUT DESCRIPTION TERMINAL CONDITIONS FUNCTION DA1 Digit Address Bit 1 (LSB) 31 VDD = Logical One VSS = Logical Zero DA1 and DA2 serve as a 2-bit Digit Address Input DA2, DA1 = 00 selects D4 DA2, DA1 = 01 selects D3 DA2, DA1 = 10 selects D2 DA2, DA1 = 11 selects D1 DA2 Digit Address Bit 2 (MSB) 32 VDD = Logical One VSS = Logical Zero CS1 Chip Select 1 33 VDD = Inactive VSS = Active When both CS1 and CS2 are taken low, the data at the Data and Digit Select code inputs are written into the input latches. On the rising edge of either Chip Select, the data is decoded and written into the output latches. CS2 Chip Select 2 34 VDD = Inactive VSS = Active Timing Diagrams FIGURE 1. MULTIPLEXED INPUT FIGURE 2. MICROPROCESSOR INTERFACE INPUT DIGIT SELECT DN-1 DIGIT SELECT DN tDH tDS DATA VALID DN DATA VALID DN-1 tIDS tWH tIDS CS1 (CS2) CS2 (CS1) DATA AND DIGIT ADDRESS = DON’T CARE tDH tDS tWI tICS ICM7211, ICM7212 |
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