GENERAL DESCRIPTION

The ADM1066 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 ADM1066 integrates a 12-bit ADC and six 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.

FEATURES

Complete supervisory and sequencing solution for up to

10 supplies

10 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

5 selectable input attenuators allow supervision of supplies to

14.4 V on VH

6 V on VP1 to VP4 (VPx)

5 dual-function inputs, VX1 to VX5 (VXx)

High impedance input to supply fault detector with

thresholds between 0.573 V and 1.375 V

General-purpose logic input

10 programmable driver outputs, PDO1 to PDO10 (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 6 voltage rails

6 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

2 auxiliary (single-ended) ADC inputs

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 40-lead, 6 mm × 6 mm LFCSP and

48-lead, 7 mm × 7 mm TQFP packages

APPLICATIONS

Central office systems

Servers/routers

Multivoltage system line cards

DSP/FPGA supply sequencing

In-circuit testing of margined supplies