P32LCD Display Module
Technical Manual
Web: http://www.pira.cz/rds/
E-mail: mail@pira.cz
2
1
2
Technical Specifications
Parameter
Value
Device kind
Optional LCD module for the PIRA32 RDS Encoder
Display unit
Alphanumerical 16 x 2 characters, white backlight
Active LCD area dimensions
66 x 16 mm
Communication bus
IIC 400 kHz
Firmware version required
1.5b or later
Character set
See Annexes
Power supply
5 V, common with 4-pin bus connector
Supply current
40 mA
Schematic Diagram
1
Adjusting elements:
R2 – LCD contrast
J2 – backlight on/off jumper
LCD connection (J1):
LCD pin
1
Vss
2
Vcc
3
Vee
4
RS
5
R/W
6
E
7
DB0
8
DB1
9
DB2
10
DB3
11
DB4
12
DB5
13
DB6
14
DB7
15
LED+
16
LED-
Connected to
Ground
+5 V
R2 trimmer
U1 pin 17
Ground
U1 pin 16
Ground
Ground
Ground
Ground
U1 pin 15
U1 pin 14
U1 pin 13
U1 pin 12
+5 V through R1
Ground
3
3
PIRA32 LCD Output
The LCD area is divided into two lines.
The first line shows key RDS services that require quick access. These services are PS (incl. dynamic), PI, TP and TA.
PS
PI
TP
TA
The second line shows the most important status values and RDS services in a loop. Depending on the configuration
some values may be omitted. For example if the internal clock source is set for the RDS subcarrier, the PILOT value is
not showed. Some events may affect the order. For example if Radiotext changes, it's showed in the next cycle
regardless of previous order value.
Status value or
RDS service
Meaning
1
RDSGEN
ON = RDS generator enabled (1), OFF = no RDS output (0).
2
LEVEL
RDS level (0 = min., 255 = max.).
Showed only if appropriate support is integrated in hardware.
Units with RDS level set by on-board trimmer skip this item.
3
PROGRAM
Actual program bank selected.
4
PTY, MS, DI
Program Type code; Music/Speech; Decoder Identification
code.
5
ADR
The RDS encoder address.
If the unit is selected (listening for the ASCII commands), the
character '*' is showed.
0,0
6
SITE
The site address.
0,0
7
UECP
ON = The RDS encoder accepts both ASCII and UECP commands,
OFF = the RDS encoder accepts ASCII commands only.
OFF
8
NOHDR
ON = No header communication mode is active,
OFF = standard communication mode.
OFF
9
SPEED
Actual RS232 port speed on which the control commands are
expected.
10
PILOT
ON = pilot tone present, OFF = no pilot tone.
11
CT
ON = CT enabled, OFF = CT disabled; RDS encoder local time.
12
GRPSEQ
First 16 items of RDS group sequence.
13
RT
Actual Radiotext (sequence of 4 x 16 characters).
Order
Default value
ON
1
022E1022EA022XYR
4
4
ANNEXES
The LCD module layout and dimensions:
Top side
Backlight on/off
Contrast adjust
Pin 1
CAUTION!
Special care is required when connecting the LCD module. Pin 1 of the LCD module to pin 1 of the RDS board etc.
Otherwise the LCD unit may become damaged! Turn off the device before connecting the LCD module.
Contour drawing, character set:
5. Contour Drawing &Block Diagram
80.0 0.5
71.2
66.0(VA)
56.2(AA)
2.5
16
31.0
5.08
11.5(AA)
25.2
16.0(VA)
K
36.0 0.5
8.6
18.3
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
13.2Max
2.5
12.55
7.55
12.45
8.0
P2.54*15=38.1
3.0
1.8 16-P1.0 PTH
15.76
10.3
5.7
4.95
A
4-P1.0
2.5
40.55
4- 2.5 PTH
4- 5.0 PAD
75.0
1.6
LED B/L
3.55
2.95
0.6
0.6
0.55
0.3mm.
0.4
5.95
5.55
0.7
0.65
The non-specified tolerance of dimension is
VR
10K~20K
Vdd
Vo
Vss
Vee
External contrast adjustment.
Com1~16
Controller/Com Driver
HD44780
or
Equivalent
Bias and
Power Circuit
80 series
or
68 series
RS
R/W
E
DB0~DB7
N.V.
Generator
MPU
DOT SIZE
SCALE 5/1
16X2 LCD
Seg1~40
Seg41~80
D
Seg Driver
M
CL1
CL2
Vdd,Vss,V1~V5
Optional
Character located
DDRAM address
DDRAM address
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F
Page 7 , Total 27 Pages
Vss
Vdd
Vo
RS
R/W
E
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
A
K
7. Character Generator ROM Pattern
Table 2.
Upper
4 bit
Lower
4 bit
LLLL LLLH LLHL LLHH LHLL LHLH LHHL LHHH HLLL HLLH HLHL HLHH HHLL HHLH HHHL HHHH
LLLL
CG
RAM
(1)
LLLH
CG
RAM
(2)
LLHL
CG
RAM
(3)
LLHH
CG
RAM
(4)
LHLL
CG
RAM
(5)
LHLH
CG
RAM
(6)
LHHL
CG
RAM
(7)
LHHH
CG
RAM
(8)
HLLL
CG
RAM
(1)
HLLH
CG
RAM
(2)
HLHL
CG
RAM
(3)
HLHH
CG
RAM
(4)
HHLL
CG
RAM
(5)
HHLH
CG
RAM
(6)
HHHL
CG
RAM
(7)
HHHH
CG
RAM
(8)
Page 11 , Total 27 Pages