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LCD Driver IC
PT6584
1/2 BIAS APPLICATION CIRCUIT
(USE WITH LARGE PANEL)
Key Matrix
(up to30 keys)
KS6
61
40
S42
S41 39
S40
62 KI1
63 KI2
64 KI3
38
S39 37
KI4
65
36
35
34
S38
66 KI5
S37
S36
67 VDD
68 VLCD
69 VLCD1
+5V
*2
+5.5V
S35 33
*1
C
R
R
S34
32
VLCD2
70
31
30
29
S33
PT6584-LQ
71 VSS
72 TEST
73 OSC
S32
S31
S30 28
S29
27
74
/RES *3
680p
43K
*4
75 DO
76 CE
77 CL
78 DI
S28
S27
26
25
V
MCU
S26 24
S25
S24
S23
23
22
21
79
80
P1/S1
P2/S2
Notes:
1. C ≥ 0.047µF; 10KΩ ≥ R ≥ 1KΩ
2. Add a capacitor to the logic block power supply line so that the logic block power supply voltage
VDD rise time when power is applied and the logic block power supply voltage VDD fall time when
power drops are both at least 1ms, as the PT6584 is reset by the VDET.
3. If the /RES pin is not used for system reset, it must be connected to the logic block power supply
VDD.
4. The DO pin, being an open-drain output, requires a pull-up resistor. Select a resistance (between 1
to 10KΩ) appropriate for the capacitance of the external wiring so that signal waveforms are not
degraded.
PT6584 V1.1
- 35 -
August, 2006
PTC [ PRINCETON TECHNOLOGY CORP ]
