X40231 Datasheet, PDF (22/36 Pages) Intersil Corporation – Triple Voltage Monitors, POR, 2 kbit EEPROM MEMORY, and Single/Dual DCP

X40231, X40233, X40235, X40237, X40239
V2MON Monitoring
The X4023x asserts the V2FAIL output HIGH if the
voltage V2MON exceeds the corresponding V_TRIP2
threshold (See Figure 21). The bit V2FS in the CR reg-
ister is then set to a “0” (assuming that it has been set
to “1” after system initialization).
The V2FAIL output may remain active HIGH with V_CC
down to 1V. (See Figure 21)
V3MON Monitoring
The X4023x asserts the V3FAIL output HIGH if the
voltage V3MON exceeds the corresponding V_TRIP3
threshold (See Figure 21). The bit V3FS in the CR reg-
ister is then set to a “0” (assuming that it has been set
to “1” after system initialization).
The V3FAIL output may remain active HIGH with V_CC
down to 1V. V_TRIPx Thresholds (x = 1,2,3)
The X4023x is shipped with pre-programmed thresh-
old (V_TRIPx) voltages. In applications where the
required thresholds are different from the default val-
ues, or if a higher precision / tolerance is required, the
X4023x trip points may be adjusted by the user, using
the steps detailed below.
V_TRIPx
Vx
0V
VxFAIL
0V
V_CC
0 Volts
V_TRIP1
(x = 2,3)
Figure 21. Voltage Monitor Response
Setting a V_TRIPx Voltage (x = 1,2,3)
There are two procedures used to set the threshold
voltages (V_TRIPx), depending if the threshold voltage to
be stored is higher or lower than the present value. For
example, if the present V_TRIPx is 2.9 V and the new
V_TRIPx is 3.2 V, the new voltage can be stored directly
into the V_TRIPx cell. If however, the new setting is to be
lower than the present setting, then it is necessary to
“reset” the V_TRIPx voltage before setting the new value.
V_CC
V2MON,
V3MON
V_TRIPx
V_P
WP
SCL
0 1 23 4 56 7
0 1 23 4 56 7
0 1 23 4 56 7
SDA
S
T
A
R
T
00h
A0h ^†
01h^† sets V_TRIP1
09h^† sets V_TRIP2
0Dh^† sets V_TRIP3
Data Byte ^†
Figure 22. Setting V_TRIPx to a higher level (x = 1,2,3).
† _{All others Reserved.}
22
FN8115.0
April 11, 2005