x9520v20iz-bt1 Intersil Corporation, x9520v20iz-bt1 Datasheet - Page 16

• Manufacturer Part Number: x9520v20iz-bt1
• Description: Fiber Channel/gigabit Ethernet Laser Diode Control For Fiber Optic Modules Triple Dcp, Por, 2kbit Eeprom Memory, Dual Voltage Monitors
• Manufacturer: Intersil Corporation

X9520 Write Permission Status
V2 Monitoring
The X9520 asserts the V2RO output HIGH if the voltage V2
exceeds the corresponding V
21). The bit V2OS in the CONSTAT register is then set to a
“0” (assuming that it has been set to “1” after system
initilization).
The V2RO output may remain active HIGH with V
1V.
V3 Monitoring
The X9520 asserts the V3RO output HIGH if the voltage V3
exceeds the corresponding V
21). The bit V3OS in the CONSTAT register is then set to a
“0” (assuming that it has been set to “1” after system
initilization).
The V3RO output may remain active HIGH with V
1V.
V
The X9520 is shipped with pre-programmed threshold
(V
thresholds are different from the default values, or if a higher
BL0
LOCK BITS
TRIPx
TRIPx
1
0
1
0
x
x
Vx
BLOCK
V1/VCC
(x = 2,3)
VxRO
) voltages. In applications where the required
FIGURE 21. VOLTAGE MONITOR RESPONSE
BL1
0 Volts
1
0
1
0
x
x
Thresholds (x = 1,2,3)
WP
1
1
1
0
0
0
DCP VOLATILE WRITE
PERMITTED
16
TRIP2
TRIP3
YES
YES
NO
NO
NO
NO
threshold (See Figure
threshold (See Figure
DCP NONVOLATILE
WRITE PERMITTED
V
V
CC
CC
TRIP1
TRIPx
down to
down to
0V
0V
YES
NO
NO
NO
NO
NO
X9520
precision/tolerance is required, the X9520 trip points may be
adjusted by the user, using the steps detailed below.
Setting a V
There are two procedures used to set the threshold voltages
(V
higher or lower than the present value. For example, if the
present V
new voltage can be stored directly into the V
however, the new setting is to be lower than the present
setting, then it is necessary to “reset” the V
before setting the new value.
Setting a Higher V
To set a V
than the present threshold, the user must apply the desired
V
(V1/VCC, V2 or V3). Then, a programming voltage (Vp) must
be applied to the WP pin before a START condition is set up on
SDA. Next, issue on the SDA pin the Slave Address A0h,
followed by the Byte Address 01h for V
V
program V
operation initiates the programming sequence. Pin WP must
then be brought LOW to complete the operation (See Figure
23). The user does not have to set the WEL bit in the
CONSTAT register before performing this write sequence.
Setting a Lower V
In order to set V
value, then V
procedure described below. Once V
then V
procedure described in “Setting a Higher V
Resetting the V
To reset a V
(Vp) to the WP pin before a START condition is set up on SDA.
Next, issue on the SDA pin the Slave Address A0h followed
by the Byte Address 03h for V
0Fh for V
reset V
WRITE TO EEPROM
Not in locked region
Not in locked region
TRIPx
TRIP2
TRIPx
Yes (All Array)
PERMITTED
TRIPx
TRIPx
, and 0Dh for V
threshold voltage to the corresponding input pin
), depending if the threshold voltage to be stored is
NO
NO
NO
TRIP3
TRIPx
TRIPx
TRIPx
TRIPx
can be set to the desired voltage using the
. The STOP bit following a valid write operation
TRIPx
TRIPx
, followed by 00h for the Data Byte in order to
is 2.9 V and the new V
TRIPx
threshold to a new voltage which is higher
. The STOP bit following a valid write
TRIPx
TRIPx
voltage, apply the programming voltage
must first be “reset” according to the
Voltage (x = 1,2,3)
TRIPx
TRIP3
to a lower voltage than the present
Voltage (x = 1,2,3).
VOLATILE BITS
Voltage (x = 1,2,3).
WRITE TO CONSTAT REGISTER
, and a 00h Data Byte in order to
Voltage (x = 1,2,3)
YES
YES
YES
NO
NO
NO
TRIP1
PERMITTED
TRIPx
, 0Bh for V
TRIPx
TRIP1
has been “reset”,
TRIPx
TRIPx
NONVOLATILE
TRIPx
, 09h for
is 3.2 V, the
TRIP2
BITS
YES
YES
YES
August 20, 2007
Voltage”.
NO
NO
NO
voltage
cell. If
, and
FN8206.2