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13
Plasma TV Service Manual
14/03/2005
12.10. ST24LC21
12.10.1. Description
The ST24LC21 is a 1K bit electrically erasable programmable memory (EEPROM), organized by 8 bits.
This device can operate in two modes: Transmit Only mode and I
2
C bidirectional mode. When powered,
the device is in Transmit Only mode with EEPROM data clocked out from the rising edge of the signal
applied on VCLK. The device will switch to the I
2
C bidirectional mode upon the falling edge of the signal
applied on SCL pin. The ST24LC21 can not switch from the I
2
C bidirectional mode to the Transmit Only
mode (except when the power supply is removed). The device operates with a power supply value as
low as 2.5V. Both Plastic Dual-in-Line and Plastic Small Outline packages are available.
12.10.2. Features
1 million Erase/Write cycles
40 years data retention
2.5V To 5.5V single supply voltage
400k Hz compatibility over the full range of supply voltage
Two wire serial interface I
2
C bus compatible
Page Write (Up To 8 Bytes)
Byte, random and sequential read modes
Self timed programming cycle
Automatic address incrementing
Enhanced ESD/Latch up
Performances
12.10.3. Pin connections
DIP Pin connections
CO Pin connections
NC: Not connected
Signal names
SDA
Serial data Address Input/Output
SCL
Serial Clock (I
2
C mode)
V
cc
Supply voltage
V
ss
Ground
VCLK
Clock transmit only mode
12.11. TLC7733
12.11.1. Description
The TLC77xx family of micropower supply voltage supervisors are designed for reset control, primarily
in microcomputer and microprocessor systems.
During power-on, RESET is asserted when V
DD
reaches 1 V. After minimum V
DD
2 V) is established,
the circuit monitors SENSE voltage and keeps the reset outputs active as long as SENSE voltage
(V
I(SENSE)
)
remains below the threshold voltage. An internal timer delays return of the output to the inactive state to
ensure proper system reset. The delay time, t
d
, is determined by an external capacitor:
t
d
= 2.1 x 10
4
x C
T
where
C
T
is in farads
Summary of Contents for HPT-4205
Page 1: ...42 PLASMA TV Built in Tuner SERVICE MANUAL...
Page 56: ...54 Plasma TV Service Manual 14 03 2005 15 CIRCUIT DIAGRAMS...
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