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Teilenummer | ADM1185 |
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Beschreibung | Quad Voltage Monitor and Sequencer | |
Hersteller | Analog Devices | |
Logo | ||
Gesamt 17 Seiten Quad Voltage Monitor and Sequencer
ADM1185
FEATURES
Powered from 2.7 V to 5.5 V on the VCC pin
Monitors 4 supplies via 0.8% accurate comparators
Logical core with internal timeouts provides power supply
sequencing and fault protection
4 inputs can be programmed to monitor different voltage
levels with resistor dividers
3 open-drain enable outputs
Open-drain power-good output (PWRGD)
10-lead MSOP
APPLICATIONS
Monitor and alarm functions
Power supply sequencing
Telecommunication and data communication equipment
PCs/servers
FUNCTIONAL BLOCK DIAGRAM
VCC
VIN1
VIN2
VIN3
VIN4
ADM1185
REF = 0.6V
REF = 0.6V
REF = 0.6V
REF = 0.6V
POWER AND
REFERENCE
REF = 0.6V
GENERATOR
STATE
MACHINE
CORE
OUT1
OUT2
OUT3
PWRGD
GND
GENERAL DESCRIPTION
The ADM1185 is an integrated, 4-channel, voltage monitoring
and sequencing device. A 2.7 V to 5.5 V power supply is
required on the VCC pin to power the device.
Four precision comparators monitor four voltage rails.
All comparators have a 0.6 V reference with a worst-case
accuracy of 0.8%. Resistor networks that are external to the
VIN1, VIN2, VIN3, and VIN4 pins set the trip points for
the monitored supply rails.
A digital core interprets the status of the comparator outputs.
Figure 1.
Internal time delays can be used for sequencing the startup of
subsequent power supplies enabled by the outputs. Supplies
falling out of range are also detected and, as a result, appropriate
outputs are disabled.
The ADM1185 has four open-drain outputs. In a typical
configuration, OUT1 to OUT3 are used to enable power
supplies, while PWRGD is a common power-good output,
indicating the status of all monitored supplies.
The ADM1185 is available in a 10-lead mini small outline
package (MSOP).
3.3V IN
APPLICATIONS DIAGRAM
2.5V OUT
1.8V OUT
1.2V OUT
VCC
ADM1185
VIN1
OUT1
VIN2
OUT2
VIN3
OUT3
VIN4
GND PWRGD
POWER
GOOD
IN
REGULATOR1
EN OUT
GND
IN
REGULATOR2
EN OUT
GND
2.5V OUT
1.8V OUT
IN
REGULATOR3
EN OUT
GND
1.2V OUT
Figure 2.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2007–2009 Analog Devices, Inc. All rights reserved.
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADM1185
GND 1
VIN1 2
VIN2 3
VIN3 4
VIN4 5
10 VCC
ADM1185
TOP VIEW
(Not to Scale)
9 OUT1
8 OUT2
7 OUT3
6 PWRGD
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 compared 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 compared 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 compared 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 compared 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 once 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.
Rev. B | Page 5 of 16
6 Page VIN1
OUT1
OUT2
OUT3
PWRGD
VT (RISING)
ADM1185
VIN1
VT (RISING)
VT (FALLING) = 0.6V
tPROP
tPROP
tPROP
190ms
OUT1
OUT2
OUT3
190ms
190ms
Figure 20. Power-Up Waveforms
PWRGD
190ms
Figure 21. Waveforms Showing Reaction to a Temporary Low Glitch
on the Main Supply
OUT1
1
OUT2
2
OUT3
3
PWRGD
4
CH1 1.00V CH2 1.00V
CH3 1.00V CH4 1.00V
M50.0ms
CH1 380mV
Figure 22. Plot of OUT1, OUT2, OUT3, and PWRGD Outputs at Startup
in an Application Similar to that Shown in Figure 18
Rev. B | Page 11 of 16
12 Page | ||
Seiten | Gesamt 17 Seiten | |
PDF Download | [ ADM1185 Schematic.PDF ] |
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