PT6553_10 Datasheet, PDF (34/41 Pages) Princeton Technology Corp – LCD Driver IC with Key Input Function

LCD Driver IC with Key Input Function
APPLICATION CIRCUIT 2
1/2 BIAS (FOR LARGE PANEL USE)
Key matrix
(up to 30 keys)
Tel: [phone]
Fax: [phone]
URL: http://www.princeton.com.tw
PT6553
+5V
R1
*1
C> 0.047DŽF
10K >R>1K
C ^R2
68K 820pF
+5V
*2
MCU
49 KO6
50 KI1
51 KI2
52 KI3
53 KI4
54 KI5
55 TEST
56 VDD
57 VDD1
58 VDD2
59 VSS
60 OSC
61 DO
62 CE
63 CLK
64 DI
PT6553
SG32 32
SG31 31
SG30 30
SG29 29
SG28 ₂₈
SG27 27
SG26 26
SG25 25
SG24 24
SG23 ₂₃
SG22 22
SG21 21
SG20 20
SG19 19
SG18 18
SG17 17
(general-purpose
output ports)
Used with the
backlight controller
or other ciucuit.
(P1)
(P2)
(P3)
(P4)
Notes:
1. Connect a capacitor to the power supply line so that the when the PT6553 is reset by the V_DET, the
power supply V_DD rise time when power is applied and the power supply voltage V_DD fall time when
power drops are both at least 1ms.
2. Since the DO Pin is an open drain output, it needs a pull-up resistor (1K to 10KΩ) which is
appropriate for the capacitance of the external wiring so that the waveforms are not degraded.
3. R1=R2, the resistance value must be decide by the LCD panel size.
PT6553 V1.7
- 34 -
November, 2007