103
Sirius-PJ1Training
Slide 103
TightCell2
IC4502
TightCell2
Gate Array
To CPU
To MM CPU
To LAMP
From FAN
Local Bus
MAIN PWB
LED PWB
LED:TEMP.
LED:LAMP
LED:STATUS
LED:POWER
Remote (Front)
REMR/REM_WIRED
KEY PWB
KEY MATRIX
(3x4)
POLED
POEX
POKEY
EX
PWB
MM RxD/TxD
LAMP RxD/TxD
FANDRT[1~8]
Tight Cell2 (IC4502) is a Gate Array which is equipped with the following
features, including fan revolution detection, key matrix, LED control. Tight Cell2
is controlled by the CPU (IC4001) via Local BUS. The supported functions are as
follows;
¾
Fan revolution detection x8: Detects the revolution from the rotational
frequency pulse signal which is output from the fan. "FAN STOP" is
detected when the revolution falls below the specification.
¾
Key matrix control: The CPU regularly monitors the key array.
¾
General-purpose I/O: Used for lighting control of LEDs and each IC.
¾
UART x2:
1st circuit for communication with the lamp.
2nd circuit for communication with the Multi Media CPU.
¾
PWM output: Used for beep generation.
¾
2nd circuit MIX for remote control signal light receiving section: Detects the
remote control header section of each signal of the light receiving section.
¾
Decoder circuit for remote controller: Decodes the received signals in
accordance with the hardware.
