MAX6885 データシートの表示（PDF） - Maxim Integrated
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MAX6885 Datasheet PDF : 34 Pages
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EEPROM-Programmable, Hex
Power-Supply Supervisory Circuits
PIN
MAX6884 MAX6885
7
7
8
8
9
9
10
10
11
—
12
—
—
11, 12
13
13
14
14
15
15
16
16
17
17
Pin Description (continued)
NAME
FUNCTION
MARGIN
SDA
SCL
A0
REFIN
AUXIN
N.C.
VCC
DBP
IN6
IN5
IN4
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.
Serial Data Input/Output (Open Drain). SDA requires an external pullup resistor.
Serial-Interface Clock Input. SCL requires an external pullup resistor.
Serial Address Input 0. Allows up to 2 devices to share a common bus. Connect A0 to
ground or the serial-interface power supply.
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.
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.
No Connection. Not internally connected.
Internal Power-Supply Voltage. Bypass VCC to GND with a 1µF ceramic capacitor as
close to the device as possible. VCC supplies power to the internal circuitry. VCC is
internally powered from the highest of the monitored IN1–IN4 voltages. Do not use VCC
to supply power to external circuitry. To externally supply VCC, see the Powering the
MAX6884/MAX6885 section.
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.
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.
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.
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 VCC (see the Powering the MAX6884/MAX6885 section).
8 _______________________________________________________________________________________
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