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PDF 25C320 Data sheet ( Hoja de datos )

Número de pieza 25C320
Descripción 32K 5.0V SPI Bus Serial EEPROM
Fabricantes MicrochipTechnology 
Logotipo MicrochipTechnology Logotipo



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No Preview Available ! 25C320 Hoja de datos, Descripción, Manual

25C320
32K 5.0V SPIBus Serial EEPROM
FEATURES
• SPI modes 0,0 and 1,1
• 3.0 MHz Clock Rate
• Single 5V Supply
• Low Power CMOS Technology
- Max Write Current: 5 mA
- Read Current: 1.0 mA at 5.5V, 3MHz
- Standby Current: 1 µA typical
• 4096 x 8 Organization
• 32 Byte Page
• Sequential Read
• Self-timed ERASE and WRITE Cycles
• Block Write Protection
- Protect none, 1/4, 1/2, or all of Array
• Built-in Write Protection
- Power On/Off Data Protection Circuitry
- Write Enable Latch
- Write Protect Pin
• High Reliability
- Endurance: 1M cycles (guaranteed)
- Data Retention: >200 years
- ESD protection: >4000V
• 8-pin PDIP/SOIC, 14-pin TSSOP
• Temperature ranges supported
- Commercial (C):
0°C to +70°C
- Industrial (I):
-40°C to +85°C
- Automotive (E):
-40°C to +125°C
DESCRIPTION
The Microchip Technology Inc. 25C320 is a 32K-bit
serial Electrically Erasable PROM (EEPROM). The
memory is accessed via a simple Serial Peripheral
Interface (SPI) compatible serial bus. The bus signals
required are a clock input (SCK) plus separate data in
(SI) and data out (SO) lines. Access to the device is
controlled through a chip select (CS) input, allowing any
number of devices to share the same bus.
There are two other inputs that provide the end user
with additional flexibility. Communication to the device
can be paused via the hold pin (HOLD). While the
device is paused, transitions on its inputs will be
ignored, with the exception of chip select, allowing the
host to service higher priority interrupts. Also write
operations to the Status Register can be disabled via
the write protect pin (WP).
PACKAGE TYPES
DIP/SOIC
CS 1
SO 2
WP 3
VSS 4
TSSOP
CS 1
SO 2
NC 3
NC 4
NC 5
WP 6
VSS 7
BLOCK DIAGRAM
Status
Register
8 VCC
7 HOLD
6 SCK
5 SI
14 VCC
13 HOLD
12 NC
11 NC
10 NC
9 SCK
8 SI
HV Generator
I/O Control
Logic
Memory
Control
Logic
X
Dec
EEPROM
Array
Page Latches
WP
SI
SO
CS
SCK
HOLD
Vcc
Vss
Y Decoder
Sense Amp.
R/W Control
SPI is a trademark of Motorola.
© 1996 Microchip Technology Inc.
Preliminary
This document was created with FrameMaker 4 0 4
DS21159B-page 1

1 page




25C320 pdf
2.0 PRINCIPLES OF OPERATION
The 25C320 is a 4096-byte EEPROM designed to
interface directly with the serial peripheral interface (SPI)
port of many of today’s popular microcontroller families,
including Microchip’s midrange PIC16CXX microcontrol-
lers. It may also interface with microcontrollers that do
not have a built-in SPI port by using discrete I/O lines
programmed properly with software.
The 25C320 contains an 8-bit instruction register. The
part is accessed via the SI pin, with data being clocked
in on the rising edge of SCK. The CS pin must be low
and the HOLD pin must be high for the entire operation.
If the WPEN bit in the status register is set, the WP pin
must be held high to allow writing to the nonvolatile bits
in the status register.
Table 2-1 contains a list of the possible instruction bytes
and format for device operation. All instructions,
addresses and data are transferred MSB first, LSB last.
Data is sampled on the first rising edge of SCK after CS
goes low. If the clock line is shared with other peripheral
devices on the SPI bus, the user can assert the HOLD
input and place the 25C320 in ‘HOLD’ mode. After
releasing the HOLD pin, operation will resume from the
point when the HOLD was asserted.
2.1 Write Enable (WREN) and Write
Disable (WRDI)
The 25C320 contains a write enable latch. This latch
must be set before any write operation will be
completed internally. The WREN instruction will set the
latch, and the WRDI will reset the latch. The following is
a list of conditions under which the write enable latch
will be reset:
• Power-up
• WRDI instruction successfully executed
• WRSR instruction successfully executed
• WRITE instruction successfully executed
2.2 Read Status Register (RDSR)
The RDSR instruction provides access to the status
register. The status register may be read at any time,
even during a write cycle. The status register is format-
ted as follows:
7 654 3 2 1 0
WPEN X X X BP1 BP0 WEL WIP
The Write-In-Process (WIP) bit indicates whether the
25C320 is busy with a write operation. When set to a ‘1’
a write is in progress, when set to a ‘0’ no write is in
progress. This bit is read only.
25C320
The Write Enable Latch (WEL) bit indicates the status
of the write enable latch. When set to a ‘1’ the latch
allows writes to the array and status register, when set
to a ‘0’ the latch prohibits writes to the array and status
register. The state of this bit can always be updated via
the WREN or WRDI commands regardless of the state
of write protection on the status register. This bit is read
only.
The Block Protection (BP0 and BP1) bits indicate
which blocks are currently write protected. These bits
are set by the user issuing the WRSR instruction.
These bits are non-volatile.
The Write Protect Enable (WPEN) bit is a nonvolatile
bit that is available as an enable bit for the WP pin. The
Write Protect (WP) pin and the Write Protect Enable
(WPEN) bit in the status register control the
programmable hardware write protect feature.
Hardware write protection is enabled when the WP pin
is low and the WPEN bit is high. Hardware write
protection is disabled when either the WP pin is high or
the WPEN bit is low. When the chip is hardware write
protected, only writes to nonvolatile bits in the status
register are disabled. See Table 2-2 for matrix of
functionality on the WPEN bit and Figure 2-1 for a
flowchart of Table 2-2.
See Figure 3-5 for RDSR timing sequence.
TABLE 2-1: INSTRUCTION SET
Instruction Instruction
Name
Format
Description
WREN
WRDI
RDSR
WRSR
READ
WRITE
0000 0110 Set the write enable latch
(enable write operations)
0000 0100 Reset the write enable
latch (disable write opera-
tions)
0000 0101 Read status register
0000 0001 Write status register (write
protect enable and block
write protection bits)
0000 0011 Read data from memory
array beginning at
selected address
0000 0010 Write data to Memory
Array beginning at
Selected Address
© 1996 Microchip Technology Inc.
Preliminary
DS21159B-page 5

5 Page





25C320 arduino
25C320
25C320 Product Identification System
To order or to obtain information (e.g., on pricing or delivery), please use the listed part numbers, and refer to the factory or the listed
sales offices.
25C320 -
/P
Package:
P = PDIP (300 mil Body), 8-lead
SN = SOIC (150 mil Body), 8-lead
ST = TSSOP (4.4 mm Body), 14-lead
Temperature
Range:
Blank = 0°C to +70°C
I = -40°C to +85°C
E = -40°C to +125°C
Device:
25C320
25C320T
32K SPI Bus Serial EEPROM
32K SPI Bus Serial EEPROM (Tape and Reel)
Sales and Support
Products supported by a preliminary Data Sheet may possibly have an errata sheet describing minor operational differences and
recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office (see next page)
2. The Microchip Corporate Literature Center U.S. FAX: (602) 786-7277
3. The Microchip’s Bulletin Board, via your local CompuServe number (CompuServe membership NOT required).
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
For latest version information and upgrade kits for Microchip Development Tools, please call 1-800-755-2345 or 1-602-786-7302.
© 1996 Microchip Technology Inc.
Preliminary
DS21159B-page 11

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