ICM7211AM_06 Datasheet, PDF (4/8 Pages) Intersil Corporation – 4-Digit, LCD Display Driver

ICM7211AM
Input Definitions In this table, V_DD and V_SS 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
V_DD = Logical One
Ones (Least Significant)
V_SS = Logical Zero
28
V_DD = Logical One
Twos
V_SS = Logical Zero
29
V_DD = Logical One
Fours
V_SS = Logical Zero
Data Input Bits
30
V_DD = Logical One
Eights (Most Significant)
V_SS = Logical Zero
36
Floating or with External Oscillator Input
Capacitor to V_DD
V_SS
Disables BP output devices, allowing segments to be synchronized to an
external signal input at the BP terminal (Pin 5).
Interface Input Configuration
INPUT DESCRIPTION DIP TERMINAL
DA1 Digit Address
31
Bit 1 (LSB)
DA2 Digit Address
32
Bit 2 (MSB)
CONDITIONS
V_DD = Logical One
V_SS = Logical Zero
V_DD = Logical One
V_SS = Logical Zero
CS1 Chip Select 1
CS2 Chip Select 2
33
V_DD = Inactive
V_SS = Active
34
V_DD = Inactive
V_SS = Active
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.
Timing Diagram
CS1
(CS2)
CS2
(CS1)
DATA AND
DIGIT
ADDRESS
t_WI
t_DS
= DON’T CARE
t_ICS
t_DH
FIGURE 1. MICROPROCESSOR INTERFACE INPUT
4
FN3158.7
April 17, 2006