Super Sequencer and Monitor
Data Sheet
ADM1068
FEATURES
FUNCTIONAL BLOCK DIAGRAM
REFOUT REFGND SDA SCL A1
A0
Complete supervisory and sequencing solution for up to
8 supplies
SMBus
VREF
INTERFACE
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
ADM1068
EEPROM
PDO1
PDO2
PDO3
PDO4
PDO5
PDO6
CONFIGURABLE
OUTPUT
DRIVERS
DUAL-
FUNCTION
INPUTS
VX1
VX2
VX3
VX4
6 V on VP1 to VP3 (VPx)
(LOGIC INPUTS
OR
(HV CAPABLE OF
DRIVING GATES
OF N-FET)
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
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
N-FET (PDO1 to PDO6 only)
SFDs)
SEQUENCING
ENGINE
CONFIGURABLE
OUTPUT
DRIVERS
VP1
VP2
VP3
PROGRAMMABLE
RESET
GENERATORS
PDO7
PDO8
(LV CAPABLE
OF DRIVING
LOGIC SIGNALS)
(SFDs)
VH
AGND
PDOGND
VDD
ARBITRATOR
VDDCAP
VCCP
GND
Sequencing engine (SE) implements state machine control of
PDO outputs
Figure 1.
State changes conditional on input events
Enables complex control of boards
Power-up and power-down sequence control
Fault event handling
GENERAL DESCRIPTION
The ADM1068 Super Sequencer® is a configurable supervisory/
sequencing device that offers a single-chip solution for supply
monitoring and sequencing in multiple supply systems.
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
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 N-FET that can be placed in the path of
a supply.
User EEPROM: 256 bytes
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
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.
APPLICATIONS
Central office systems
Servers/routers
Multivoltage system line cards
DSP/FPGA supply sequencing
In-circuit testing of margined supplies
The ADM1068 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 ADM1068 register map, refer
to the AN-721 Application Note.
Rev. D
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