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MAX6884ETP+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34
MAX6884/MAX6885
EEPROM-Programmable, Hex
Power-Supply Supervisory Circuits
_______________________________________________________________________________________ 7
PROPAGATION DELAY (µs)
1.25
1.50
1.75
2.00
2.50
2.25
2.75
3.00
1.00
MR TO RESET OR UV/OV OUTPUT
PROPAGATION DELAY vs. TEMPERATURE
MAX6884 toc10
TEMPERATURE (
°
C)
603510-15-40 85
PIN
MAX6884
MAX6885
NAME FUNCTION
11RESET
Reset Output. Configurable, active-low, open drain, or weak pullup. RESET assumes its
programmed conditional output state when V
CC
exceeds UVLO (2.5V).
22WDO
Watchdog Timer Output. Configurable, active-low, open drain, or weak pullup. WDO
asserts when WDI is not toggled with a valid high-to-low or low-to-high transition within
the watchdog timeout period.
33UV/OV
Undervoltage/Overvoltage Output. Configurable, active-low, open drain, or weak pullup.
UV/OV assumes its programmed conditional output state when V
CC
exceeds UVLO
(2.5V).
44GND Ground
55WDI
Watchdog Timer Input. Logic input for the watchdog timer function. If WDI is not toggled
with a valid low-to-high or high-to-low transition within the watchdog timeout period,
WDO asserts. Progam initial and normal watchdog timeout periods from 6.25ms to
102.4s. WDI is internally pulled down to GND through a 10µA current sink.
66MR
Manual Reset Input. Program MR to assert RESET and/or UV/OV when MR is asserted.
Leave MR unconnected or connect to DBP if unused. MR is internally pulled up to DBP
through a 10µA current source.
Typical Operating Characteristics (continued)
(V
IN1
–V
IN4
or V
CC
= 5V, AUXIN = WDI = GND, MARGIN = MR = DBP. Typical values are at T
A
= +25°C, unless otherwise noted.)
ADC ACCURACY vs. TEMPERATURE
TOTAL UNADJUSTED ERROR (%)
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-0.5
MAX6884 toc11
TEMPERATURE (
°
C)
603510-15-40 85
V
IN5
= 2V,
10mV/STEP
RANGE
V
IN1
= 5V,
20mV/STEP
RANGE
VAUXIN = 1V
Pin Description
MAX6884/MAX6885
EEPROM-Programmable, Hex
Power-Supply Supervisory Circuits
8 _______________________________________________________________________________________
PIN
MAX6884
MAX6885
NAME FUNCTION
77
MARGIN
Margin Input. MARGIN holds RESET, UV/OV, and WDO in their existing states when
MARGIN is driven low. Leave MARGIN unconnected or connect to DBP if unused.
MARGIN is internally pulled up to DBP through a 10µA current source. MARGIN
overrides MR if both are asserted at the same time.
88SDA Serial Data Input/Output (Open Drain). SDA requires an external pullup resistor.
99SCL Serial-Interface Clock Input. SCL requires an external pullup resistor.
10 10 A0
Serial Address Input 0. Allows up to 2 devices to share a common bus. Connect A0 to
ground or the serial-interface power supply.
11 — REFIN
Reference Voltage Input. Program the device for external or internal reference. Connect
an external +1.225V to +1.275V reference to REFIN when using an external reference.
Leave REFIN unconnected when using the internal reference.
12 — AUXIN
Auxiliary Input. A 10-bit ADC converts the input voltage at AUXIN. The high-impedance
AUXIN input accepts input voltages up to 1.25V. AUXIN does not affect programmable
outputs.
— 11, 12 N.C. No Connection. Not internally connected.
13 13 V
CC
Internal Power-Supply Voltage. Bypass V
CC
to GND with a 1µF ceramic capacitor as
close to the device as possible. V
CC
supplies power to the internal circuitry. V
CC
is
internally powered from the highest of the monitored IN1–IN4 voltages. Do not use V
CC
to supply power to external circuitry. To externally supply V
CC
, see the Powering the
MAX6884/MAX6885 section.
14 14 DBP
Internal Digital Power-Supply Voltage. Bypass DBP to GND with a 1µF ceramic
capacitor. DBP supplies power to the EEPROM memory, the internal logic circuitry, and
the programmable outputs. Do not use DBP to supply power to external circuitry.
15 15 IN6
Voltage-Detector Input 6. Program two thresholds per voltage-detector input
(undervoltage UV and undervoltage/overvoltage UV/OV). Program IN6 detector
thresholds from 1V to 5.8V in 20mV increments, 0.5V to 3.05V in 10mV increments. For
improved noise immunity, bypass IN6 to GND with a 0.1µF capacitor installed as close
to the device as possible.
16 16 IN5
Voltage-Detector Input 5. Program two thresholds per voltage-detector input
(undervoltage UV and undervoltage/overvoltage UV/OV). Program IN5 detector
thresholds from 1V to 5.8V in 20mV increments, 0.5V to 3.05V in 10mV increments. For
improved noise immunity, bypass IN5 to GND with a 0.1µF capacitor installed as close
to the device as possible.
17 17 IN4
Voltage-Detector Input 4. Program two thresholds per voltage-detector input
(undervoltage UV and undervoltage/overvoltage UV/OV). Program IN4 detector
thresholds from 1V to 5.8V in 20mV increments, 0.5V to 3.05V in 10mV increments. For
improved noise immunity, bypass IN4 to GND with a 0.1µF capacitor installed as close
to the device as possible. Program the device to receive power through IN1–IN4 inputs
or V
CC
(see the Powering the MAX6884/MAX6885 section).
Pin Description (continued)
MAX6884/MAX6885
EEPROM-Programmable, Hex
Power-Supply Supervisory Circuits
_______________________________________________________________________________________ 9
PIN
MAX6884
MAX6885
NAME FUNCTION
18 18 IN3
Voltage-Detector Input 3. Program two thresholds per voltage-detector input
(undervoltage UV and undervoltage/overvoltage UV/OV). Program IN3 detector
thresholds from 1V to 5.8V in 20mV increments, or 0.5V to 3.05V in 10mV increments.
For improved noise immunity, bypass IN3 to GND with a 0.1µF capacitor installed as
close to the device as possible. Program the device to receive power through IN1–IN4
inputs or V
CC
(see the Powering the MAX6884/MAX6885 section).
19 19 IN2
Voltage-Detector Input 2. Program two thresholds per voltage-detector input
(undervoltage UV and undervoltage/overvoltage UV/OV). Program IN2 detector
thresholds from 1V to 5.8V in 20mV increments, or 0.5V to 3.05V in 10mV increments.
For improved noise immunity, bypass IN2 to GND with a 0.1µF capacitor installed as
close to the device as possible. Program the device to receive power through IN1–IN4
inputs or V
CC
(see the Powering the MAX6884/MAX6885 section).
20 20 IN1
Voltage-Detector Input 1. Program two thresholds per voltage-detector input
(undervoltage UV and undervoltage/overvoltage UV/OV). Program IN1 detector
thresholds from 1V to 5.8V in 20mV increments, or 0.5V to 3.05V in 10mV increments.
For improved noise immunity, bypass IN1 to GND with a 0.1µF capacitor installed as
close to the device as possible. Program the device to receive power through IN1–IN4
inputs or V
CC
(see the Powering the MAX6884/MAX6885 section).
——EP Exposed Paddle. Internally connected to GND. Connect EP to GND or leave floating.
Pin Description (continued)
Detailed Description
The MAX6884/MAX6885 EEPROM-configurable, multi-
voltage supply supervisors monitor six voltage-detector
inputs, one auxiliary input, and one watchdog input,
and feature three programmable outputs for highly con-
figurable, power-supply monitoring applications (see
Table 1 for programmable features). Manual reset and
margin disable inputs offer additional flexibility.
Each voltage detector provides a programmable pri-
mary undervoltage and secondary undervoltage/over-
voltage threshold. Program thresholds from 0.5V to
3.05V in 10mV increments, 1.0V to 5.8V in 20mV incre-
ments, or from 0.1667V to 1.0167V in 3.3mV incre-
ments. To achieve thresholds from 0.1667V to 1.0167V
in 3.3mV increments, the respective input voltage
detector must be programmed for high impedance
and an external voltage-divider must be connected. A
fault register logs undervoltage and overvoltage condi-
tions for each voltage-detector input.
An internal 10-bit ADC (MAX6884 only) converts volt-
ages at IN1–IN6, AUXIN, and V
CC
through a multiplex-
er that automatically sequences through all inputs
every 200ms. Access the device’s internal 512-bit user
EEPROM, configuration EEPROM, configuration regis-
ters, ADC registers, and fault registers through an
SMBus/I
2
C-compatible serial interface (see the
SMBus/I
2
C-Compatible Serial Interface section). The
MAX6884/MAX6885 also feature an accurate internal
1.25V reference. For greater accuracy, connect an
external 1.25V reference to REFIN (MAX6884 only).
Program outputs RESET, UV/OV, and WDO for open-
drain or weak pullup. Program RESET and UV/OV to
assert on any voltage-detector input, MR, or each other.
RESET can also depend on WDO. Programmable timing
delay blocks configure each output to wait between
25µs and 1600ms before deasserting. Fault registers log
the assertion of RESET, UV/OV, and WDO.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34

MAX6884ETP+

Mfr. #:
Buy MAX6884ETP+
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits EEPROM-Prog Hex Power-Sup Sequencer
Lifecycle:
New from this manufacturer.
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