AT45DB161E-CCUD-T Adesto Technologies, AT45DB161E-CCUD-T Datasheet - Page 19

• Manufacturer Part Number: AT45DB161E-CCUD-T
• Description: Flash 16M 2.5-3.6V 85Mhz Serial Flash
• Manufacturer: Adesto Technologies

Specifications of AT45DB161E-CCUD-T

• Rohs: yes
• Data Bus Width: 8 bit
• Memory Type: Data Flash
• Memory Size: 16 Mbit
• Architecture: Flexible, Uniform Erase
• Timing Type: Synchronous
• Interface Type: SPI
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.5 V
• Maximum Operating Current: 26 mA
• Operating Temperature: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: BGA-9
• Factory Pack Quantity: 4000
• Part # Aliases: AT45DB161D-CU

7.2
Figure 7-2. Disable Sector Protection
Hardware Controlled Protection
Sectors specified for protection in the Sector Protection Register and the Sector Protection Register itself can be
protected from program and erase operations by asserting the WP pin and keeping the pin in its asserted state. The
Sector Protection Register and any sector specified for protection cannot be erased or programmed as long as the WP
pin is asserted. In order to modify the Sector Protection Register, the WP pin must be deasserted. If the WP pin is
permanently connected to GND, then the contents of the Sector Protection Register cannot be changed. If the WP pin is
deasserted or permanently connected to V
The WP pin will override the software controlled protection method but only for protecting the sectors.
Example:
A noise filter is incorporated to help protect against spurious noise that may inadvertently assert or deassert the WP pin.
Figures 7-3 and Table 7-3
Protection command, and the Disable Sector Protection command.
Figure 7-3. WP Pin and Protection Status
Table 7-3.
CS
WP
Period
Time
SI
1
2
3
WP Pin
Each transition represents eight bits
If the sectors were not previously protected by the Enable Sector Protection command, then simply
asserting the WP pin would enable the sector protection within the maximum specified t
WP pin is deasserted, however, the sector protection would no longer be enabled (after the maximum
specified t
asserted. If the Enable Sector Protection command was issued before or while the WP pin was asserted,
then simply deasserting the WP pin would not disable the sector protection. In this case, the Disable Sector
Protection command would need to be issued while the WP pin is deasserted to disable the sector
protection. The Disable Sector Protection command is also ignored whenever the WP pin is asserted.
WP Pin and Protection Status
High
High
Low
3Dh
Enable Sector Protection Command
Command Issued During Period 1 or 2
WPD
1
Command Not Issued Previously
detail the sector protection status for various scenarios of the WP pin, the Enable Sector
time) as long as the Enable Sector Protection command was not issued while the WP pin was
2Ah
Issue Command
Issue Command
—
—
X
CC
7Fh
, then the contents of the Sector Protection Register can be modified.
A9h
2
Protection Command
Issue Command
Issue Command
Disable Sector
Not Issued Yet
Adesto AT45DB161E [DATASHEET]
—
—
X
X
Protection
Disabled
Disabled
Disabled
Enabled
Enabled
Enabled
Enabled
Sector
Status
3
8782D–DFLASH–11/2012
WPE
time. When the
Protection
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Read/Write
Register
Sector
Read
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