MAX6884ETP MAXIM [Maxim Integrated Products], MAX6884ETP Datasheet - Page 17

• Manufacturer Part Number: MAX6884ETP
• Description: EEPROM-Programmable, Hex Power-Supply Supervisory Circuits
• Manufacturer: MAXIM [Maxim Integrated Products]

The MAX6884/MAX6885 feature three programmable
active-low outputs: RESET, UV/OV, and WDO. Program
each output for open-drain or weak pullup. An internal
10kΩ resistor connected from each output to a 2.55V
internal LDO provides a weak pullup. During power-up,
the outputs are held low for 1V < V
output programmed to depend on no condition always
remains in its active state. For example, if the state of
UV/OV is not programmed to depend on any condition,
UV/OV will always be low.
gram of a typical relationship between a monitored
input voltage and outputs RESET and UV/OV. RESET
and UV/OV are a function of only IN1.
Program RESET to depend on MR, UV/OV, WDO, or
any programmable primary voltage-detector input (see
Figure
(OVERVOLTAGE)
3. Output Timing Diagram
SECONDARY
THRESHOLD
THRESHOLD
PRIMARY
UV/OV
RESET
V
IN1
______________________________________________________________________________________
Programmable Outputs
Figure
Power-Supply Supervisory Circuits
3 shows a timing dia-
CC
< V
UVLO
EEPROM-Programmable, Hex
RESET
. Any
t
UP
Table 6). As an example, RESET may depend on the
IN3 primary undervoltage threshold, MR, UV/OV, and
WDO. Write 1’s to R11h[1:0], R11h[4], and R12h[7] to
configure as indicated. IN3 must be above the under-
voltage threshold, MR must be high, UV/OV must be
deasserted, and WDO must be deasserted to be a
logic “1,” then RESET deasserts. The logic state of
RESET, in this example, is equivalent to the logical
statement:
RESET remains low for its programmed timeout period
(t
removed. Program timeout periods for RESET from
25µs to 1600ms (see
open-drain or weak pullup through bit R12h[0].
RP
) after all assertion-causing conditions are
IN3 · MR · UV/OV · WDO
t
RP
Table
6). Configure RESET for
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