PT6522
LCD Display Driver
DESCRIPTION
The PT6522 is a general purpose LCD display driver
which can be used for frequency display applications
in microprocessor-controlled radio receivers and other
display applications.
FEATURES
•
53 segment outputs
•
Two drive types are possible: static (1/1) duty (53
segments) and 1/2 duty (104 segments)
•
INH pin for turning off all display output
•
RC oscillation circuit
•
Power supply voltage: 3.0 to 6.5V
•
Available in 64-pin QFP or LQFP package
APPLICATIONS
•
•
•
•
•
•
Electronic dictionary/calculator
P.O.S. terminal
Call ID device
Pager
Mini component system
Electronic equipment with LCD display
BLOCK DIAGRAM
Tel: 886-66296288
‧
Fax: 886-29174598
‧
http://www.princeton.com.tw
‧
2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PT6522
APPLICATION CIRCUIT 1
Note: 39KΩ
≥
R
≥
10KΩ
APPLICATION CIRCUIT 2
Note:
When power (V
DD
) is first applied, the internal display data is undefined and a meaningless pattern will result if the display is turned on in this state. To
avoid the display should be turned off by setting /INH low and turned on only after display data has been sent from the controller.
V1.6
2
August 2010
PT6522
ORDERING INFORMATION
Valid Part Number
PT6522-Q
PT6522LQ
Package Type
64 pins, QFP
64 pins, LQFP
Top Code
PT6522-Q
PT6522LQ
PIN CONFIGURATION
PIN DESCRIPTION
Pin Name
SG1 to SG53
OSC
VSS, VDD
Description
Segment output pins
Oscillator connection
Power supply
Display off control input
/INH=low (VSS)=Display off (SG1 to SG53, COM1, COM2=low)
/INH=high (VDD)=Display on
Note that serial data transfers are allowed when display output is turned off using this
pin.
LCD bias voltage setting
Serial data transfer inputs
Common output pins (For static (1/1) drive only COM1 is used, COM2 must be left
open)
No connection
3
Pin No.
1~23, 25~53
55
59, 56
/INH
57
VLCD
CE, CLK, DI
COM1, COM2
NC
V1.6
58
60, 61, 62
64, 63
24
August 2010
PT6522
INPUT/OUPUT CONFIGURATIONS
The schematic diagrams of the input and output circuits of the logic section are shown below:
INPUT PIN: CLK, CE, DI, /INH
OUTPUT PIN: COM1 TO COM2, SG1 TO SG53
V1.6
4
August 2010
PT6522
FUNCTION DESCRIPTION
DATA TRANSFER FORMAT
1. Static (1/1) duty
2. 1/2 duty (if there are no more that 52 display segments, only 64 bits need to be transferred. The transfer format is the
same as the static duty case. It is not possible to alter the D54 to D106 data without specifying the D1 to D53 data.)
Address: A2
H
DP: Drive type selection bit
DP=0: 1/1 duty
DP=1: 1/2 duty
D1 to D106: Display data
Dn (for n=1 to 106)=0: Segment off
Dn (for n=1 to 106)=1: Segment on
x: don't care
DATA TRANSFER EXAMPLES
1. Static duty
2. 1/2 duty with 52 or fewer segments
3. 1/2 duty with more than 52 segments
Note: the following transfer format is not allowed in 1/2 duty with 52 or fewer segments.
V1.6
5
August 2010
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