MCP98243 Microchip Technology Inc., MCP98243 Datasheet - Page 38

• Manufacturer Part Number: MCP98243
• Description: Memory Module Temperature Sensor W/ Eeprom For Spd
• Manufacturer: Microchip Technology Inc.

MCP98243
5.3.3.1
The SWP feature is invoked by writing to the write-pro-
tect register. This is done by sending an Address Byte
similar to a normal Write command.
the timing diagram. SWP can be cleared using the
CWP command. See Section 5.3.3.2 “Clear Write
Protect (CWP)”
FIGURE 5-16:
Communication”).
5.3.3.2
The CWP feature is invoked by writing to the clear
write-protect register. This is done by sending an
Address Byte similar to a normal Write command.
Figure 5-18
SWP only. PWP can not be cleared using this
command.
FIGURE 5-17:
Communication”).
DS22153A-page 38
SCL
SCL
SDA
SDA
Note:
Note:
shows the timing diagram. CWP clears
Software Write Protect (SWP)
Clear Write Protect (CWP)
S
S
Apply V
1
0
Apply V
1
0
2
1
Timing Diagram for Setting Software Write Protect (See Section 4.0 “Serial
2
1
Timing Diagram for Setting Clear Write Protect (See Section 4.0 “Serial
Address Byte
Address Byte
3
1
3
1
HV
HV
4
4
0
0
at A0 pin, apply V
at A0 pin and connect GND to A1 and A2 pins to initiate SWP cycle.
5
0
5
0
6
6
Figure 5-18
0
1
7
7
1
1
MCP98243
MCP98243
W
W
8
8
A
C
K
A
C
K
DD
shows
1
X
1
X
at A1 pin, connect A2 pin to GND to initiate CWP cycle.
2
X
2
X
Word Address
Word Address
3
3
X
X
4
4
X
X
5
X
5
X
The Slave Address bits need to correspond to the
address pin logic configuration. For SWP, a high
voltage V
corresponding slave address needs to be set to ‘1’, as
shown in
and the corresponding slave address bits are set to ‘0’.
The device response in this mode is shown in
5
The Slave Address bits need to correspond to the
address pin logic configuration. For CWP, a high
voltage V
corresponding slave address needs to be set to ‘1’.
The A1 pin is set to V
address bit is set to ‘1’. And A2 pins is set to ground
and the corresponding slave address bits are set to ‘0’.
Table 5-4
response in this mode is shown in
Table
and
6
6
X
X
7
7
X
X
5-6.
Table
MCP98243
MCP98243
8
8
X
X
HV
Table
HV
shows the bit configuration. The device
A
C
K
A
C
K
5-6.
needs to be applied to the A0 pin and the
needs to be applied to the A0 pin and the
1
1
X
X
5-4. Both A2 and A1 pins are grounded
2
2
X
X
3
3
X
X
DD
© 2009 Microchip Technology Inc.
Data
Data
4
4
X
X
and the corresponding slave
5
5
X
X
6
6
X
X
7
7
X
X
MCP98243
MCP98243
8
8
X
X
Table 5-5
A
C
K
A
C
K
P
P
Table 5-
and