AT25M01
SPI Serial EEPROM 1 Mbits (131,072 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 Operation:
– 1.7V (V
CC
= 1.7V to 5.5V)
• Industrial Temperature Range: -40°C to +85°C
• 20 MHz Clock Rate (5V)
• 256‑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
• ESD Protection > 4,000V
• High Reliability:
– Endurance: 1,000,000 write cycles
– Data retention: 100 years
• Green (Lead-free/Halide-free/RoHS Compliant) Package Options
• Die Sale Options: Wafer Form and Bumped Wafers
Packages
• 8-Lead SOIC, 8-Lead SOIJ and 8-Ball WLCSP
©
2019 Microchip Technology Inc.
Datasheet
20006226A-page 1
AT25M01
Table of Contents
Features.......................................................................................................................... 1
Packages.........................................................................................................................1
1. Package Types (not to scale).................................................................................... 4
2. Pin Description.......................................................................................................... 5
2.1.
2.2.
2.3.
2.4.
2.5.
2.6.
2.7.
2.8.
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
3. 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 Timimg.................................................................................................. 13
Electrical Specifications..............................................................................................................13
5. Device Operation.....................................................................................................15
5.1.
5.2.
5.3.
5.4.
Interfacing the AT25M01 on the SPI Bus................................................................................... 15
Device Opcodes......................................................................................................................... 16
Hold Function............................................................................................................................. 16
Write Protection..........................................................................................................................17
6. Device Commands and Addressing........................................................................ 18
6.1.
6.2.
6.3.
6.4.
STATUS Register Bit Definition and Function............................................................................ 18
Read STATUS Register (RDSR)..................................................................................................19
Write Enable (WREN) and Write Disable (WRDI)......................................................................... 19
Write STATUS Register (WRSR).................................................................................................. 20
7. Read Sequence.......................................................................................................23
8. Write Sequence....................................................................................................... 24
8.1.
8.2.
8.3.
Byte Write...................................................................................................................................24
Page Write..................................................................................................................................24
Polling Routine........................................................................................................................... 25
©
2019 Microchip Technology Inc.
Datasheet
20006226A-page 2
AT25M01
9. Packaging Information.............................................................................................26
9.1.
Package Marking Information.....................................................................................................26
10. Revision History.......................................................................................................34
The Microchip Website.................................................................................................. 35
Product Change Notification Service.............................................................................35
Customer Support......................................................................................................... 35
Product Identification System........................................................................................ 36
Microchip Devices Code Protection Feature................................................................. 36
Legal Notice...................................................................................................................37
Trademarks................................................................................................................... 37
Quality Management System........................................................................................ 38
Worldwide Sales and Service........................................................................................39
©
2019 Microchip Technology Inc.
Datasheet
20006226A-page 3
AT25M01
Package Types (not to scale)
1.
Package Types (not to scale)
8-Lead SOIC/SOIJ
(Top View)
CS
SO
WP
GND
1
2
3
4
8
7
6
5
Vcc
HOLD
SCK
SI
8-Ball WLCSP
(Top View)
V
CC
SCK
HOLD
SI
WP
SO
GND
CS
©
2019 Microchip Technology Inc.
Datasheet
20006226A-page 4
AT25M01
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(1)
GND
SI
SCK
HOLD(1)
VCC
8-Lead SOIC
1
2
3
4
5
6
7
8
8-Lead SOIJ
1
2
3
4
5
6
7
8
8-Ball WLCSP
A5
B4
C3
C5
C1
B2
A3
A1
Function
Chip Select
Serial Data Output
Write-Protect
Ground
Serial Data Input
Serial Data Clock
Suspends Serial Input
Device Power Supply
Note:
1. The Write-Protect (WP) and Hold (HOLD) pins should be driven high or low as appropriate.
2.1
Chip Select (CS)
The AT25M01 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 AT25M01. 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 AT25M01 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.
©
2019 Microchip Technology Inc.
Datasheet
20006226A-page 5
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