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ICM7211A Datasheet, PDF (5/9 Pages) Intersil Corporation – 4-Digit, LCD Display Driver
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ICM7211A
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
DIP TERMINAL
CONDITIONS
FUNCTION
B0
B1
B2
B3
OSC
27
VDD = Logical One
Ones (Least Significant)
VSS = Logical Zero
28
VDD = Logical One
Twos
VSS = Logical Zero
29
VDD = Logical One
Fours
VSS = Logical Zero
Data Input Bits
30
VDD = Logical One
Eights (Most Significant)
VSS = Logical Zero
36
Floating or with External Oscillator Input
Capacitor to VDD
VSS
Disables BP output devices, allowing segments to be synchronized to
an external signal input at the BP terminal (Pin 5).
Multiplexed-Binary Input Configuration
INPUT
TERMINAL
D1
31
D2
32
D3
33
D4
34
CONDITIONS
VDD = Active
VSS = Inactive
FUNCTION
D1 Digit Select (Least Significant)
D2 Digit Select
D3 Digit Select
D4 Digit Select (Most Significant)
Microprocessor Interface Input Configuration
INPUT DESCRIPTION DIP TERMINAL
CONDITIONS
DA1 Digit Address
Bit 1 (LSB)
DA2 Digit Address
Bit 2 (MSB)
31
VDD = Logical One
VSS = Logical Zero
32
VDD = Logical One
VSS = Logical Zero
CS1 Chip Select 1
CS2 Chip Select 2
Timing Diagrams
33
VDD = Inactive
VSS = Active
34
VDD = Inactive
VSS = Active
DIGIT SELECT
tIDS
DN-1
DIGIT SELECT
DN
FUNCTION
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
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.
tWH
tIDS
tDH
CS1
(CS2)
CS2
(CS1)
DATA AND
DIGIT
ADDRESS
DATA VALID
DN-1
DATA VALID
DN
tDS
FIGURE 1. MULTIPLEXED INPUT
tWI
tICS
tDH
tDS
= DON’T CARE
FIGURE 2. MICROPROCESSOR INTERFACE INPUT
5
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