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CAV25320 Datasheet(PDF) 4 Page - ON Semiconductor

Part # CAV25320
Description  32-Kb SPI Serial CMOS EEPROM
Download  13 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAV25320 Datasheet(HTML) 4 Page - ON Semiconductor

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CAV25320
http://onsemi.com
4
Pin Description
SI: The serial data input pin accepts op−codes, addresses
and data. In SPI modes (0,0) and (1,1) input data is latched
on the rising edge of the SCK clock input.
SO: The serial data output pin is used to transfer data out of
the device. In SPI modes (0,0) and (1,1) data is shifted out
on the falling edge of the SCK clock.
SCK: The serial clock input pin accepts the clock provided
by the host and used for synchronizing communication
between host and CAV25320.
CS: The chip select input pin is used to enable/disable the
CAV25320. When CS is high, the SO output is tri−stated
(high impedance) and the device is in Standby Mode (unless
an internal write operation is in progress). Every
communication session between host and CAV25320 must be
preceded by a high to low transition and concluded with a low
to high transition of the CS input.
WP: The write protect input pin will allow all write
operations to the device when held high. When WP pin is
tied low and the WPEN bit in the Status Register (refer to
Status Register description, later in this Data Sheet) is set to
“1”, writing to the Status Register is disabled.
HOLD: The HOLD input pin is used to pause transmission
between host and CAV25320, without having to retransmit
the entire sequence at a later time. To pause, HOLD must be
taken low and to resume it must be taken back high, with the
SCK input low during both transitions. When not used for
pausing, the HOLD input should be tied to VCC, either
directly or through a resistor.
Functional Description
The CAV25320 device supports the Serial Peripheral
Interface (SPI) bus protocol, modes (0,0) and (1,1). The
device contains an 8−bit instruction register. The instruction
set and associated op−codes are listed in Table 7.
Reading data stored in the CAV25320 is accomplished by
simply providing the READ command and an address.
Writing to the CAV25320, in addition to a WRITE
command, address and data, also requires enabling the
device for writing by first setting certain bits in a Status
Register, as will be explained later.
After a high to low transition on the CS input pin, the
CAV25320 will accept any one of the six instruction
op−codes listed in Table 7 and will ignore all other possible
8−bit combinations. The communication protocol follows
the timing from Figure 2.
Table 7. INSTRUCTION SET
Instruction
Opcode
Operation
WREN
0000 0110
Enable Write Operations
WRDI
0000 0100
Disable Write Operations
RDSR
0000 0101
Read Status Register
WRSR
0000 0001
Write Status Register
READ
0000 0011
Read Data from Memory
WRITE
0000 0010
Write Data to Memory
Figure 2. Synchronous Data Timing
CS
SCK
SI
SO
tCNH
tCSS
tWH
tWL
tSU
tH
HI−Z
VALID
IN
VALID
OUT
tCSH
tRI
tFI
tV
tV
tHO
tCNS
tCS
HI−Z
tDIS


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