AT25080B/AT25160B/
AT25320B/AT25640B
SPI Automotive Temperature Serial EEPROM
8 Kbits (1,024 x 8), 16 Kbits (2,048 x 8),
32 Kbits (4,096 x 8) and 64 Kbits (8,192 x 8)
Features
•
•
•
Serial Peripheral Interface (SPI) Compatible
Supports SPI Modes 0 (0,0) and 3 (1,1):
– Data sheet describes mode 0 operation
Low-Voltage and Medium-Voltage Operation:
– Grade 1, V
CC
= 2.5V to 5.5V
– Grade 3, V
CC
= 1.7V to 5.5V
Extended Temperature Range (Grade 1 and Grade 3 as defined in AEC-Q100):
– Grade 1 Temperature Range: -40°C to +125°C
– Grade 3 Temperature Range: -40°C to +85°C
5 MHz Clock Rate (5V)
32‑Byte Page Mode
Block Write Protection:
– Protect 1/4, 1/2 or entire array
Write-Protect (WP) Pin and Write Disable Instructions for Both Hardware and Software Data Protection
Self-Timed Write Cycle within 5 ms Maximum
Automotive AEC-Q100 Qualified
High Reliability:
– Endurance: 1,000,000 write cycles
– Data retention: 100 years
Green (Lead-free/Halide-free/RoHS Compliant) Package Options
•
•
•
•
•
•
•
•
•
Packages
•
8-Lead SOIC, 8-Lead TSSOP and 8-Pad UDFN
©
2020 Microchip Technology Inc.
DS20006310A-page 1
AT25080B/AT25160B/AT25320B/AT25640B
Table of Contents
Features......................................................................................................................................................... 1
Packages........................................................................................................................................................1
1.
2.
Package Types (not to scale)..................................................................................................................4
Pin Description........................................................................................................................................ 5
2.1.
2.2.
2.3.
2.4.
2.5.
2.6.
2.7.
2.8.
3.
Chip Select (CS)...........................................................................................................................5
Serial Data Output (SO)............................................................................................................... 5
Write-Protect (WP)....................................................................................................................... 5
Ground (GND).............................................................................................................................. 5
Serial Data Input (SI)....................................................................................................................6
Serial Data Clock (SCK)...............................................................................................................6
Suspend Serial Input (HOLD).......................................................................................................6
Device Power Supply (V
CC
)......................................................................................................... 6
Description.............................................................................................................................................. 7
3.1.
3.2.
SPI Bus Master Connections to Serial EEPROMs.......................................................................7
Block Diagram.............................................................................................................................. 8
4.
Electrical Characteristics.........................................................................................................................9
4.1.
4.2.
4.3.
4.4.
4.5.
4.6.
Absolute Maximum Ratings..........................................................................................................9
DC and AC Operating Range.......................................................................................................9
DC Characteristics....................................................................................................................... 9
AC Characteristics......................................................................................................................10
SPI Synchronous Data Timing....................................................................................................11
Electrical Specifications..............................................................................................................11
5.
Device Operation.................................................................................................................................. 13
5.1.
5.2.
5.3.
5.4.
Interfacing the AT25080B/AT25160B/AT25320B/AT25640B on the SPI Bus.............................13
Device Opcodes......................................................................................................................... 14
Hold Function............................................................................................................................. 14
Write Protection..........................................................................................................................15
6.
Device Commands and Addressing......................................................................................................16
6.1.
6.2.
6.3.
6.4.
STATUS Register Bit Definition and Function............................................................................ 16
Read STATUS Register (RDSR)..................................................................................................17
Write Enable (WREN) and Write Disable (WRDI)......................................................................... 17
Write STATUS Register (WRSR).................................................................................................. 18
7.
8.
Read Sequence.................................................................................................................................... 21
Write Sequence.....................................................................................................................................22
8.1.
8.2.
8.3.
Byte Write...................................................................................................................................22
Page Write..................................................................................................................................22
Polling Routine........................................................................................................................... 23
9.
Packaging Information.......................................................................................................................... 24
©
2020 Microchip Technology Inc.
DS20006310A-page 2
AT25080B/AT25160B/AT25320B/AT25640B
9.1.
Package Marking Information.....................................................................................................24
10. Revision History.................................................................................................................................... 33
The Microchip Website.................................................................................................................................34
Product Change Notification Service............................................................................................................34
Customer Support........................................................................................................................................ 34
Product Identification System.......................................................................................................................35
Microchip Devices Code Protection Feature................................................................................................ 36
Legal Notice................................................................................................................................................. 36
Trademarks.................................................................................................................................................. 36
Quality Management System....................................................................................................................... 37
Worldwide Sales and Service.......................................................................................................................38
©
2020 Microchip Technology Inc.
DS20006310A-page 3
AT25080B/AT25160B/AT25320B/AT25640B
Package Types (not to scale)
1.
Package Types (not to scale)
8-Lead SOIC/TSSOP
(Top View)
CS
SO
WP
GND
1
2
3
4
8
7
6
5
Vcc
HOLD
SCK
SI
CS
SO
WP
GND
1
2
3
4
8-Pad UDFN
(Top View)
8
7
6
5
Vcc
HOLD
SCK
SI
©
2020 Microchip Technology Inc.
DS20006310A-page 4
AT25080B/AT25160B/AT25320B/AT25640B
Pin Description
2.
Pin Description
The descriptions of the pins are listed in
Table 2-1.
Table 2-1. Pin Function Table
Name
CS
SO
WP
(2)
GND
SI
SCK
HOLD
(2)
V
CC
8-Lead SOIC
1
2
3
4
5
6
7
8
8-Lead TSSOP
1
2
3
4
5
6
7
8
8-Pad UDFN
(1)
1
2
3
4
5
6
7
8
Function
Chip Select
Serial Data Output
Write-Protect
Ground
Serial Data Input
Serial Data Clock
Suspends Serial Input
Device Power Supply
Note:
1. The exposed pad on this package can be connected to GND or left floating.
2. The Write-Protect (WP) and Hold (HOLD) pins should be driven high or low as appropriate.
2.1
Chip Select (CS)
The AT25080B/AT25160B/AT25320B/AT25640B is selected when the Chip Select (CS) pin is low. When the device is
not selected, data will not be accepted via the Serial Data Input (SI) pin, and the Serial Output (SO) pin will remain in
a high‑impedance state.
To ensure robust operation, the CS pin should follow V
CC
upon power-up. It is therefore recommended to connect CS
to V
CC
using a pull-up resistor (less than or equal to 10 kΩ). After power-up, a low level on CS is required prior to any
sequence being initiated.
2.2
Serial Data Output (SO)
The Serial Data Output (SO) pin is used to transfer data out of the AT25080B/AT25160B/AT25320B/AT25640B.
During a read sequence, data is shifted out on this pin after the falling edge of the Serial Data Clock (SCK).
2.3
Write-Protect (WP)
The Write-Protect (WP) pin will allow normal read/write operations when held high. When the WP pin is brought low
and the WPEN bit is set to a logic ‘1’, all write operations to the STATUS register are inhibited. WP going low while
CS is still low will interrupt a write operation to the STATUS register. If the internal write cycle has already been
initiated, WP going low will have no effect on any write operation to the STATUS register. The WP pin function is
blocked when the WPEN bit in the STATUS register is set to a logic ‘0’. This will allow the user to install the
AT25080B/AT25160B/AT25320B/AT25640B in a system with the WP pin tied to ground and still be able to write to the
STATUS register. All WP pin functions are enabled when the WPEN bit is set to a logic ‘1’.
2.4
Ground (GND)
The ground reference for the Device Power Supply (V
CC
). The Ground (GND) pin should be connected to the system
ground.
©
2020 Microchip Technology Inc.
DS20006310A-page 5
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