x9523v20iz-bt1 Intersil Corporation, x9523v20iz-bt1 Datasheet - Page 14

• Manufacturer Part Number: x9523v20iz-bt1
• Description: Dual Dcp, Por, Dual Voltage Monitors
• Manufacturer: Intersil Corporation

V
The X9523 is shipped with pre-programmed threshold
(V
thresholds are different from the default values, or if a
higher precision/tolerance is required, the X9523 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
to be stored is higher or lower than the present value.
For example, if the present V
new V
directly into the V
is to be lower than the present setting, then it is neces-
sary to “reset” the V
new value.
V1 / Vcc
TRIPX
V2, V3
TRIPx
WP
SCL
WP
SDA
SCL
TRIPx
SDA
) voltages. In applications where the required
THRESHOLDS (X = 1,2,3)
TRIPx
is 3.2 V, the new voltage can be stored
TRIPx
R
S
T
A
T
), depending if the threshold voltage
R
S
T
A
T
TRIPx
0 1 2 3 4 5 6 7
Voltage (x = 1,2,3)
0 1 2 3 4 5 6 7
TRIPx
cell. If however, the new setting
14
A0h
A0h
voltage before setting the
Figure 17. Setting V
†
TRIPx
Figure 18. Resetting the V
†
V
TRIPx
is 2.9 V and the
0 1 2 3 4 5 6 7
0 1 2 3 4 5 6 7
03h
0Bh
0Fh
01h
09h
0Dh
†
†
†
Resets VTRIP1
Resets VTRIP3
Resets VTRIP2
V
†
†
†
TRIPx
P
sets V
sets V
sets V
X9523
V
P
to a higher level (x = 1,2,3).
TRIP1
TRIP2
TRIP3
TRIPx
Setting a Higher V
To set a V
higher than the present threshold, the user must apply
the desired V
sponding input pin (V1/Vcc, V2 or V3). Then, a pro-
gramming 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
0Dh for V
gram V
operation initiates the programming sequence. Pin WP
must then be brought LOW to complete the operation
(See Figure 18). The user does not have to set the
WEL bit in the CONSTAT register before performing
this write sequence.
Level
TRIPx
0 1 2 3 4 5 6 7
Data Byte
TRIP3
0 1 2 3 4 5 6 7
00h
TRIPx
Data Byte
. The STOP bit following a valid write
TRIPx
, and a 00h Data Byte in order to pro-
†
00h
threshold to a new voltage which is
threshold voltage to the corre-
TRIPx
†
†
TRIP1
All others Reserved.
Voltage (x = 1,2,3)
†
All others Reserved.
, 09h for V
TRIP2
January 3, 2006
FN8209.1
, and