SMM764FCR2 datasheet(6/33 Pages) SUMMIT

6 / 33 page

SMM764

Preliminary Information

Summit Microelectronics, Inc

2098 1.1 6/29/2005

Number

Type

Pin Name

Pin Description

I/O

SEQ_LINK

SEQ_LINK (Sequence-Link™) is an open drain bi-directional pin. This pin

should be attached to other Sequence-Link devices, during linked operation.

SEQ_LINK must be pulled high through an external pull-up resistor when

multiple Sequence-Link devices are used. When the SMM764 is not used

with another Sequence-Link device, SEQ_LINK should be tied directly to

ground.

I/O

VREF

VREF (Voltage Reference) is a bi-directional analog pin. VREF is used for

Active DC Output Control and margining. VREF can be programmed to

output the internal 1.25V reference, or accept an external reference. VREF is

also used as a reference for the ADC.

CAP

FILT_CAP

FILT_CAP (Filter Capacitor) is an external capacitor input used to filter VMX

inputs.

16,17,

18,20,

21,22,

23,25

No Connect

Leave open, do not connect. These pins must be left floating.

41,36,

31,26

VMX

VMX (Voltage Monitor) pins are analog inputs. These pins are normally

attached to the positive converter sense line, VMA through VMD.

42,37,

32,27

CAP

CAPX

External capacitor input used to filter the VMX inputs to the 10-bit ADC, CAPA

through CAPD. This provides an RC filter where R = 25kΩ..

43,38,

33,28

OUT

PUPX

PUPX (Power Up Permitted) pins are programmable active high/low open

drain converter enable output, PUPA through PUPD.

44,39,

34,29

OUT

TRIMX

Output voltage used to control the output of DC/DC converters, TRIMA

through TRIMD.

45,40,

35,30

CAP

TRIM_CAPX

TRIM_CAPX is an analog output pin used to control the output of DC/DC

converters. If the ADOC/margining functionality is not used on a channel the

associated TRIM_CAPX pin should be left floating. There are 4 TRIM_CAPX

pins, TRIM_CAPA through TRIM_CAPD.

PWR

VDD

Power supply of the part

PWR

12VIN

12VIN (12 Volt Input) is a power supply input internally regulated to either

3.6V or 5.5V.

CAP

VDD_CAP

VDD_CAP ( VDD Capacitor) is an external capacitor input used to filter the

internal supply.

PIN DESCRIPTIONS (Cont.)

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