Sharp DV-SL700W Service Manual page 57

IC104, EEPROM 2K BIT 2-WIRE SERIAL
DESCRIPTION:
The Turbo IC 24CO1/24CO2 is a serial 1K/2K EEPROM fabricated
with Turbo's proprietary, high reliability, high performance CMOS
technology. It's 1K/2K of memory is configured as 16/32 pages with
each page containing 8 bytes. This device offers significant
advantages in low power applications.
The Turbo IC 24C01/24C02 uses the PC addressing protocol and
2-wire serial interface which includes a bidirectional serial data bus
syncronized by a clock. It offers a flexible byte write and a faster 8-
byte page write.
The Turbo IC 24C01/24C02 is assembled in either a 8-pin PDIP or
8-pin SOIC package. Pin #1 is the A0 device address input for the
device. Pin#2 is the A1 device adrress input for the device. Pin #3
is the A2 device address input for the device, such that a total of
eight 24C01/24C02 devices can be connected on a single bus. Pin
#4 is the ground (Vss). Pin #5 is the serial data (SDA) pin used for
Pin Description:
PIN DESCRIPTION:
DEVICE ADDRESS (A0 & A1 & A2)
A0, A1, and A2 are device address inputs that enables a total of
sight 24C02 devices to connect on a simple bus, if the address
input pin is left unconnected, it is interpreted as zero.
WRITE PROTECT(WP)
When the write protect input is connected to Vcc, the entire mem-
ory array is protected against write operations. For normal write
operations, the write protect pin should be grounded, When the pin
is left unconnected. WP is interpreted as zero.
A0 1
A1 2
A2
3
GND 4
8 PIN SOIC
.
bidirectional transfer of data. Pin#6 is the serial clock (SCL) input
pin. Pin #7 is the write protect (WP) pin used to be protect
hardware data. Pin#8 is the power supply (Vcc) pin.
All data is serially transmitted in bytes (8 bits) on the SDA bus. To
access the Turbo IC24C01/24C02 (slave) for a raad or write
operation, the controller (master) issues a start condition by pulling
SDA from high to low while SCL is high. The master then issues the
device address byte which consists of 1010(A2)(A1)(A0)(RW). The
most significant bits(1010) are a device type code signifying an
EEPROM device. A0,A1,and A2 are the device address select bits
which has to match the A0,A1,and A2 pin inputs on the device. The
B[7] bit (or B[6] bit in the 24C01) is the most significant bit of the
memory address. The read/write bit determines whether to do a
read or write operation. After each byte is transmitted , the receiver
has to provide an acknowledge by pulling the SDA bus low on the
ninth clock cycle. The acknowledge is a handshake signal to the
transmitter indicating a successful data transmission.
8 VCC
WP
7
6 SCL
5
SDA
SERIAL DATA(SDA)
SDA is a bidirectional pin used to transfer data in and out of the
Turbo IC24C01/24C02. The pin is an open-drain output. A pullup
resistor must be connected from SDA to Vcc.
SERIAL CLOCK(SCL)
The SCL input synchronizes the data or the SDA bus. It is used in
conjunction with SDA to define the start and stop conditions. It is
also used in conjunction with SDA to transfer data to and from the
Turbo IC 24C01/24C02.
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DV-SL700W