NJU6060 Datasheet, PDF (3/12 Pages) New Japan Radio – Full Color LED Controller Driver with PWM Control

! BLOCK DIAGRAM
V_DD
OSC
V_DD
RSTb
C
CSb
P
CLK
U _DATA
V_SS
OSC
I
/
Instruction
F
Decoder
NJU6060
32step
PWM
32step
PWM
32step
PWM
Driver
Driver
Driver
LED1
LED2
V_LED
LED3
! FUNCTIONAL DESCRIPTIONS
(1) Description for each blocks
(1-1) PWM Luminance Control
The NJU6060 incorporates three channel of 32 steps PWM Luminance Control circuits. 32 steps of Luminance
Control by setting up DUTY. The relation between a register and DUTY is shown below:
REGISTER
0,0,0,0,0
0,0,0,0,1
0,0,0,1,0
0,0,0,1,1
0,0,1,0,0
0,0,1,0,1
0,0,1,1,0
0,0,1,1,1
DUTY
1/32
2/32
3/32
4/32
5/32
6/32
7/32
8/32
REGISTER
0,1,0,0,0
0,1,0,0,1
0,1,0,1,0
0,1,0,1,1
0,1,1,0,0
0,1,1,0,1
0,1,1,1,0
0,1,1,1,1
DUTY
9/32
10/32
11/32
12/32
13/32
14/32
15/32
16/32
REGISTER
1,0,0,0,0
1,0,0,0,1
1,0,0,1,0
1,0,0,1,1
1,0,1,0,0
1,0,1,0,1
1,0,1,1,0
1,0,1,1,1
DUTY
17/32
18/32
19/32
20/32
21/32
22/32
23/32
24/32
REGISTER
1,1,0,0,0
1,1,0,0,1
1,1,0,1,0
1,1,0,1,1
1,1,1,0,0
1,1,1,0,1
1,1,1,1,0
1,1,1,1,1
DUTY
25/32
26/32
27/32
28/32
29/32
30/32
31/32
32/32
(1-2) Oscillator
The NJU6060 Oscillation circuit is generated clock which generates PWM by connecting external resistor.
The oscillation circuit with the external register generate the clock for PWM. The PWM frequency (f_PWM) is finely
adjusted by value of the external register. In addition, the ON/OFF of oscillation circuit is controlled by the instruction,
and the current consumption is decreased when it was OFF of the oscillation circuit.
If PWM was high when the oscillation circuit became OFF, the situation of PWM was kept. Input OFF command of
the output port.
Ver.2004-04-16
-3-