Analog Devices ADM1169 Manual

FEATURES

Complete supervisory and sequencing solution for up to
8 supplies
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
6 V on VP1 to VP3 (VPx)
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
NFET (PDO1 to PDO6 only)
Sequencing engine (SE) implements state machine control of
PDO outputs
State changes conditional on input events
Enables complex control of boards
Power-up and power-down sequence control
Fault event handling
Interrupt generation on warnings
Watchdog function can be integrated in SE
Program software control of sequencing through SMBus
Complete voltage margining solution for 4 voltage rails
4 voltage output 8-bit DACs (0.300 V to 1.551 V) allow voltage
adjustment via dc-to-dc converter trim/feedback node
12-bit ADC for readback of all supervised voltages
Reference input (REFIN) has 2 input options
Driven directly from 2.048 V (±0.25%) REFOUT pin
More accurate external reference for improved ADC
performance
Device powered by the highest of VPx, VH for improved
redundancy
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 and 40-lead,
6 mm × 6 mm LFCSP packages
Rev. 0
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Super Sequencer with Margining Control
and Nonvolatile Fault Recording

APPLICATIONS

Central office systems
Servers/routers
Multivoltage system line cards
DSP/FPGA supply sequencing
In-circuit testing of margined supplies
VX1
VX2
VX3
VX4
VP1
VP2
VP3
VH
AGND

GENERAL DESCRIPTION

The ADM1169 Super Sequencer® is a configurable supervisory/
sequencing device that offers a single-chip solution for supply
monitoring and sequencing in multiple supply systems. In addition
to these functions, the ADM1169 integrates a 12-bit ADC and
four 8-bit voltage output DACs. These circuits can be used to
implement a closed-loop margining system that enables supply
adjustment by altering either the feedback node or reference of
a dc-to-dc converter using the DAC outputs.
Supply margining can be performed with a minimum of external
components. The margining loop can be used for in-circuit
testing of a board during production (for example, to verify
board functionality at −5% of nominal supplies), or it can be
used dynamically to accurately control the output voltage of
a dc-to-dc converter.
For more information about the ADM1169 register map, refer
to the
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113

FUNCTIONAL BLOCK DIAGRAM

REFIN REFOUT REFGND
ADM1169
VREF
12-BIT
SAR ADC
CLOSED-LOOP
MARGINING SYSTEM
DUAL-
FUNCTION
INPUTS
(LOGIC INPUTS
OR
SFDs)
SEQUENCING
ENGINE
PROGRAMMABLE
RESET
GENERATORS
(SFDs)
V V V V
OUT OUT OUT OUT
DAC DAC DAC DAC
DAC1 DAC2 DAC3 DAC4
Figure 1.
AN-721 Application Note.
©2011 Analog Devices, Inc. All rights reserved.
ADM1169
SDA SCL A1 A0
SMBus
INTERFACE
FAULT
EEPROM
RECORDING
PDO1
CONFIGURABLE
OUTPUT PDO2
DRIVERS
PDO3
PDO4
(HV CAPABLE OF
PDO5
DRIVING GATES
OF NFET)
PDO6
CONFIGURABLE
OUTPUT
DRIVERS
PDO7
(LV CAPABLE
PDO8
OF DRIVING
LOGIC SIGNALS)
PDOGND
VDD
VDDCAP
ARBITRATOR
VCCP GND
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