Super Sequencer and Monitor with
Nonvolatile Fault Recording
ADM1168
FEATURES
FUNCTIONAL BLOCK DIAGRAM
REFOUT REFGND SDA SCL A1
A0
Complete supervisory and sequencing solution for up to
8 supplies
SMBus
INTERFACE
VREF
16 event deep black box nonvolatile fault recording
8 supply fault detectors enable supervision of supplies to
<0.5% accuracy at all voltages at 25°C
<1.0% accuracy across all voltages and temperatures
4 selectable input attenuators allow supervision of supplies to
14.4 V on VH
ADM1168
FAULT RECORDING
EEPROM
PDO1
PDO2
PDO3
PDO4
PDO5
PDO6
CONFIGURABLE
OUTPUT
DRIVERS
DUAL-
FUNCTION
INPUTS
VX1
VX2
VX3
VX4
(LOGIC INPUTS
OR
(HV CAPABLE OF
DRIVING GATES
OF NFET)
6 V on VP1 to VP3 (VPx)
SFDs)
4 dual-function inputs, VX1 to VX4 (VXx)
High impedance input to supply fault detector with
thresholds between 0.573 V and 1.375 V
General-purpose logic input
SEQUENCING
ENGINE
CONFIGURABLE
OUTPUT
VP1
VP2
VP3
PROGRAMMABLE
RESET
DRIVERS
PDO7
PDO8
GENERATORS
(LV CAPABLE
OF DRIVING
LOGIC SIGNALS)
(SFDs)
8 programmable driver outputs, PDO1 to PDO8 (PDOx)
Open-collector with external pull-up
Push/pull output, driven to VDDCAP or VPx
Open-collector with weak pull-up to VDDCAP or VPx
Internally charge-pumped high drive for use with external
NFET (PDO1 to PDO6 only)
VH
AGND
PDOGND
VDD
ARBITRATOR
VDDCAP
VCCP
GND
Figure 1.
Sequencing engine (SE) implements state machine control of
PDO outputs
GENERAL DESCRIPTION
The ADM1168 Super Sequencer® is a configurable supervisory/
sequencing device that offers a single-chip solution for supply
monitoring and sequencing in multiple supply systems.
State changes conditional on input events
Enables complex control of boards
Power-up and power-down sequence control
Fault event handling
The device also provides up to eight programmable inputs for
monitoring undervoltage faults, overvoltage faults, or out-of-window
faults on up to eight supplies. In addition, eight programmable
outputs can be used as logic enables. Six of these programmable
outputs can also provide up to a 12 V output for driving the gate
of an NFET that can be placed in the path of a supply.
Interrupt generation on warnings
Watchdog function can be integrated in SE
Program software control of sequencing through SMBus
Device powered by the highest of VPx, VH for improved
redundancy
User EEPROM: 256 bytes
The logical core of the device is a sequencing engine. This state
machine-based construction provides up to 63 different states.
This design enables very flexible sequencing of the outputs based
on the condition of the inputs.
Industry-standard 2-wire bus interface (SMBus)
Guaranteed PDO low with VH, VPx = 1.2 V
Available in 32-lead, 7 mm × 7 mm LQFP
A block of nonvolatile EEPROM is available that can be used to
store user-defined information and may also be used to hold a
number of fault records that are written by the sequencing engine
defined by the user when a particular fault or sequence occurs.
APPLICATIONS
Central office systems
Servers/routers
Multivoltage system line cards
DSP/FPGA supply sequencing
In-circuit testing of margined supplies
The ADM1168 is controlled via configuration data that can be
programmed into an EEPROM. The whole configuration can be
programmed using an intuitive GUI-based software package
provided by Analog Devices, Inc.
For more information about the ADM1168 register map, refer
to the AN-721 Application Note.
Rev. 0
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.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2011 Analog Devices, Inc. All rights reserved.
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