ICM7211ALM44 INTERSIL [Intersil Corporation], ICM7211ALM44 Datasheet - Page 7

• Manufacturer Part Number: ICM7211ALM44
• Description: 4-Digit, ICM7211 (LCD) and ICM7212 (LED) Display Drivers
• Manufacturer: INTERSIL [Intersil Corporation]

Input Definitions
ICM7211 Multiplexed-Binary Input Configuration
ICM7211M/ICM7212M Microprocessor Interface Input Configuration
Timing Diagrams
B0
B1
B2
B3
OSC (LCD Devices
Only)
INPUT
DA1
DA2
CS1
CS2
INPUT
INPUT
D1
D2
D3
D4
Digit Address
Bit 1 (LSB)
Digit Address
Bit 2 (MSB)
Chip Select 1
Chip Select 2
DESCRIPTION
DATA AND
ADDRESS
(CS2)
(CS1)
DIGIT
DIGIT SELECT
DIGIT SELECT
CS1
CS2
In this table, V
specified under Operating Characteristics. For lowest power consumption, input signals should swing over the full supply.
TERMINAL
D
27
28
29
30
36
N-1
D
TERMINAL
N
TERMINAL
DD
DATA VALID
31
32
33
34
and V
31
32
33
34
D
V
V
V
V
V
V
V
V
Floating or with External
Capacitor to V
V
N-1
FIGURE 2. MICROPROCESSOR INTERFACE INPUT
DD
SS
DD
SS
DD
SS
DD
SS
SS
SS
= Logical Zero
= Logical Zero
= Logical Zero
= Logical Zero
= Logical One
= Logical One
= Logical One
= Logical One
CONDITIONS
are considered to be normal operating input logic levels. Actual input low and high levels are
= DON’T CARE
V
V
V
V
V
V
V
V
DD
SS
DD
SS
DD
SS
DD
SS
FIGURE 1. MULTIPLEXED INPUT
ICM7211, ICM7212
CONDITIONS
= Logical Zero
= Logical Zero
= Active
= Active
V
V
= Logical One
= Logical One
= Inactive
= Inactive
DD
t
DD
SS
t
WI
DS
t
IDS
= Active
= Inactive
CONDITIONS
9-12
Ones (Least Significant)
Twos
Fours
Eights (Most Significant)
Oscillator Input
Disables BP output devices, allowing segments to be synchronized to
an external signal input at the BP terminal (Pin 5).
DATA VALID
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.
t
t
ICS
t
DS
DH
D
t
N
WH
D1 Digit Select (Least Significant)
D2 Digit Select
D3 Digit Select
D4 Digit Select (Most Significant)
FUNCTION
t
IDS
FUNCTION
t
DH
FUNCTION
Data Input Bits