Datasheet

ADM1185
Rev. B | Page 5 of 16
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
GND 1
VIN1 2
VIN2
3
VIN3
4
VIN4 5
VCC 10
OUT1 9
OUT2
8
OUT3
7
PWRGD 6
ADM1185
TOP VIEW
(Not to Scale)
06196-003
Figure 3.
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1 GND Chip Ground Pin.
2 VIN1
Noninverting Input of Comparator 1. The voltage on this pin is compa
red with a 0.6 V reference. Can be used to
monitor a voltage rail via a resistor divider. The output of this comparator is monitored by the state machine core.
This input can also be driven by a logic signal to initiate a power-up sequence.
3 VIN2
Noninverting Input of Comparator 2. The voltage on this pin is compa
red with a 0.6 V reference. Can be used to
monitor a voltage rail via a resistor divider. The output of this comparator is monitored by the state machine core.
4 VIN3
Noninverting Input of Comparator 3. The voltage on this pin is compa
red with a 0.6 V reference. Can be used to
monitor a voltage rail via a resistor divider. The output of this comparator is monitored by the state machine core.
5 VIN4
Noninverting Input of Comparator 4. The voltage on this pin is compa
red with a 0.6 V reference. Can be used to
monitor a voltage rail via a resistor divider. The output of this comparator is monitored by the state machine core.
6 PWRGD
Active-High, Open-Drain Output. This output is pulled low onc
e VCC = 1 V. When the voltage on each VINx input
exceeds 0.6 V, the state machine moves from STATE4 to STATE5, and PWRGD is asserted. Once in STATE5 (the
PWRGD state), this output is driven low if the voltage on VIN1, VIN2, VIN3, or VIN4 falls below 0.6 V.
7 OUT3
Active-High, Open-Drain Output. This output is pulled low once
VCC = 1 V. When the voltage on VIN3 exceeds 0.6 V,
the state machine moves from STATE3 to STATE4, and OUT3 is asserted. Once the power-up sequence is complete
and STATE5 (the PWRGD state) is reached, this output is driven low if the voltage on VIN1 falls below 0.6 V.
8 OUT2
Active-High, Open-Drain Output. This output is pulled low once
VCC = 1 V. When the voltage on VIN2 exceeds 0.6 V,
the state machine moves from STATE2 to STATE3, and OUT2 is asserted. Once the power-up sequence is complete
and STATE5 (the PWRGD state) is reached, this output is driven low if the voltage on VIN1 falls below 0.6 V.
9 OUT1
Active-High, Open-Drain Output. This output is pulled low once
VCC = 1 V. When the voltage on VIN1 exceeds 0.6 V,
the state machine moves from STATE1 to STATE2, and OUT1 is asserted. A time delay of 190 ms (typical) is included
before the assertion of this pin. Once the power-up sequence is complete and STATE5 (the PWRGD state) is
reached, this output is driven low if the voltage on VIN1 falls below 0.6 V.
10 VCC Positive Supply Input Pin. The operating supply voltage range is 2.7 V to 5.5 V.