Pioneer SX-20-K Service Manual page 26

1
A J000241600170-IL (MAIN ASSY : IC102)
CW24Cxx_EEPROM
• Pin Arrangement
(Top view)
A0 1 8
A1 2 7
3 6
A2
B
4 5
GND
C
• Pin Function
No. Name
Address input. The A2, A1 and A0 pins are device address inputs.
1 A0 The CW24C02 uses the A2, A1 and A0 inputs for hard wire addressing and
D
a total of eight CW24C02 devices may be addressed on a single bus system
(device addressing is discussed in detail under the Device Addressing
section).
2 A1
The CW24C04 uses the A2 and A1 inputs for hard wire addressing and a
total of four CW24C04 devices may be addressed on a single bus system.
The A0 pin is a no connect and can be connected to GND.
The CW24C08 only uses the A2 input for hardwire addressing and a total of
two CW24C08 devices may be addressed on a single bus system. The A0
and A1 pins are no connects and can be connected to GND.
3 A2
E The CW24C16 does not use the device address pins, which limits the
number of devices on a single bus to one. The A0, A1 and A2 pins are no
connects and can be connected to GND.
Serial address and data I/O. The SDA pin is bi-directional for serial data
5 SDA transfer. It is an open-drain pin, therefore the SDA bus requires a pull-up
resistor to V
Serial clock input. The SCL input is used to synchronize the data transfer to
6 SCL and from each EEPROM device. It's positive edge clock data into the device
and negative edge clock data out of the device.
Write protect. The WP pin that provides hardware data protection. The WP
pin allows normal read/write operations when connected to ground (GND).
7 WP
When the WP pin is connected to V
F
and read only.
4 GND Circuit ground pin.
8 V Positive supply voltage.
CC
26
1
2
• Block Diagram
Vcc
WP
SCL
SDA
Function Description
(typical 10 kΩ).
CC
, the write protection feature is enabled
CC
2
3
SX-20-K
3
4
4