Advertisement
2. HARDWARE DESCRIPTION
1. Block diagram
Key Board
Matrix
Battery Replacement
Switch
Reset Switch
Power ON Button
Main Battery Voltage
Detection
Level Converter
4P Serial Communications
Port
(for PC synchronize)
9.8304MHz
X'tal
32.768kHz
X'tal
2-1. CPU (T5L55) : COB (Bare Chip) is used
1) Features
•
Microcontroller T5L55 is a revised version of T6B31
•
Added/revised functions of T5L55 compare to T6B31 are follows.
1. IrDA1.0 encorder/decorder circuit is integrated.
2. 120 segment LCD driver controller function is aclded.
3. LCD refresh frequency is revised.
4. Some gate circuits such as the interrupt circuit, the reset circuit
and the latch circuit are added.
•
The chip has 100 pads. The pad pitch is 150um, and is as same
as T6B31.
•
Operating voltage : VDD = +4.5 ~ +5.5V
CPU JT5L55
CPU core
Z80
Interrupt
Chip Select
Controller
Controller
Serial
Interface
LCD
Controller
IrDA
Encoder
/Decoder
Main Clock
Main Clock
Oscillator
Clock
RTC
Oscillator
FROM
SRAM
16Mbit
1Mbit
FROM
8Mbit
EL Driver
Common
Driver
80 common
LVC
Contrast
Adjust
Step Up
Segment Driver
120 segment
Piezo Electric
Buzzer
Power Conversion
(5.0V Step Up)
2-2. LCD driver (JT6J14-AS) : COB
(Bare Chip ) is used
The JT6J14-AS is an 120-channel-output column driver for an STN
dot matrix LCD. The JT6J14-AS features 28-V LCD drive voltage and
a 10-MHz maximum operating frequency. The JT6J14-AS is able to
drive LCD panels with a duty ratio of up to 1/160.
1) Features
•
Display duty application:
•
LCD drive signal:
•
Data transfer:
•
Maximum Operating frequency: 10 MHz (V
•
LCD drive voltage:
•
Power supply Operating voltage: 2.7 to 5.5 V
•
Operating temperature:
•
LCD drive output resistance:
•
Display-off function:
When /DSPOF is L, all LCD drive out-
puts (O1 to O120) remain at the V
level.
•
Low power consumption: Cascade connections and auto enable
transfer functions are available.
EL Backlight
LCD
239seg x 80com
Segment Driver
120 segment
Vcc
Vbatt
Voltage
Detector
Main Batteries
(LR6 x 2)
to 1/160
120
4-bit bidirectional
= 4.5 V),
DD
6.5 MHz (V
= 2.7 V)
DD
11 to 28 V
(maximum drive voltage = 30 V)
–20 to 75°C
2.2 kΩ (max)
(12.8 V, 1/7 to 1/14 bias)
SS
/V5
Advertisement
