LP3952RLX National Semiconductor, LP3952RLX Datasheet - Page 14

• Manufacturer Part Number: LP3952RLX
• Manufacturer: National Semiconductor

Specifications of LP3952RLX

• Operating Supply Voltage (typ): 3.3/5V
• Number Of Segments: 6
• Operating Temperature (min): -30C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Pin Count: 36
• Mounting: Surface Mount
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / Rohs Status: Not Compliant

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Command Based Pattern Generator for Color LEDs
The LP3952 has an unique stand-alone command based pattern generator with 8 user controllable 16-bit commands. Since reg-
isters are 8-bit long one command requires 2 write cycles. Each command has intensity level for each LED, command execution
time (CET) and transition time (TT) as seen in the following figures.
COMMAND REGISTER WITH 8 COMMANDS
COLOR INTENSITY CONTROL
Each color has 3-bit intensity level. Level control is logarith-
mic, 2 curves are selectable. The LOG bit in register 11H
defines the curve used as seen in the following table.
R[2:0], G[2:0],
COMMAND 1
COMMAND 2
COMMAND 3
COMMAND 4
COMMAND 5
COMMAND 6
COMMAND 7
COMMAND 8
B[2:0]
000
001
010
011
100
101
110
111
ADDRESS 5AH
ADDRESS 5BH
ADDRESS 5CH
ADDRESS 5DH
ADDRESS 5EH
ADDRESS 50H
ADDRESS 51H
ADDRESS 52H
ADDRESS 53H
ADDRESS 54H
ADDRESS 55H
ADDRESS 56H
ADDRESS 57H
ADDRESS 58H
ADDRESS 59H
ADDRESS 5FH
LOG=0
100
[% × I
14
21
32
46
71
0
7
CURRENT
MAX(COLOR)
LOG=1
100
10
21
46
0
1
2
4
CET1
CET1
CET1
CET1
CET1
CET1
CET1
CET1
]
R2
R2
R2
R2
R2
R2
R2
R2
CET0
CET0
CET0
CET0
CET0
CET0
CET0
CET0
R1
R1
R1
R1
R1
R1
R1
R1
14
R0
B2
R0
B2
R0
B2
R0
B2
R0
B2
R0
B2
R0
B2
R0
B2
G2
G2
G2
G2
G2
G2
G2
G2
B1
B1
B1
B1
B1
B1
B1
B1
G1
G1
G1
G1
G1
G1
G1
G1
B0
B0
B0
B0
B0
B0
B0
B0
TT2
TT2
TT2
TT2
TT2
TT2
TT2
TT2
G0
G0
G0
G0
G0
G0
G0
G0
30023819
CET3
CET3
CET3
CET3
CET3
CET3
CET3
CET3
TT1
TT1
TT1
TT1
TT1
TT1
TT1
TT1
CET2
CET2
CET2
CET2
CET2
CET2
CET2
CET2
TT0
TT0
TT0
TT0
TT0
TT0
TT0
TT0
30023820