HD66727 Datasheet, PDF (82/97 Pages) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

HD66727
LED/Back Light Control
The HD66727 has three LED ports to control the LED and back light, which need current driving, and
three general ports, which do not need current driving. However, the sink current in the LED port output is
up to 3 mA. If the back light or LED needs more current, increase the current width with the transistor.
Table 37 LED Driving and General Output Port
AAN Address
MSB
0 01
LSB
1
LED Driving/General Output Port
Bit 7 Bit 6 Bit 5 Bit 4
*
*
PORT2 PORT1
Bit 3
PORT0
Bit 2
LED2
Bit 1
LED1
Bit 0
LED0
V_CC
HD66727
LED0
LED1
LED2
LED
display
Back
light
PORT0
PORT1
PORT2
GND
Figure 48 LED Driving Control Circuit Examples
82