GENERAL DESCRIPTION

The ADM1069 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 ADM1069 integrates a 12-bit analog-todigital converter (ADC) and four 8-bit voltage output digital-toanalog converters (DACs). These circuits can implement a closedloop margining system that enables supply adjustment by altering either the feedback node or reference of a dc-to-dc converter using the DAC outputs.

FEATURES

Complete supervisory and sequencing solution for up to

8 supplies

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

N-FET (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

APPLICATIONS

Central office systems

Servers/routers

Multivoltage system line cards

DSP/FPGA supply sequencing

In-circuit testing of margined supplies