SMS66 datasheet(4/26 Pages) SUMMIT

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SMS66

Preliminary Information

Summit Microelectronics, Inc

2070 1.0 7/16/03

Number

Type

Pin Name

Pin Description

DATA

SDA

2C Bi-directional data line

CLK

SCL

2C Clock line

The address pin is biased either to VDD_CAP or GND.

When

communicating with the SMS66 over the 2-wire bus A2 provides a

mechanism for assigning a unique bus address.

Programmable active high/low input. When asserted the RST output will be

go active. When de-asserted the RST output will go inactive immediately

after a reset timeout period (tPRTO) if there are no RST trigger sources active.

This timeout period makes it suitable to use a pushbutton for manual reset.

PWR_ON/OFF

Programmable active high/low input signals the start of the power

sequencing. When asserted the part will sequence the supplies on and

when de-asserted the part will sequence the supplies off.

Programmable active high/low input. Force shutdown is used to immediately

turn off all converter enable signals (PUP outputs)

OUT

FAULT

Programmable active high/low open drain Fault output.

Active when a

programmed fault condition exists on AIN1, AIN2, or the internal temperature

sensor.

OUT

HEALTHY

Programmable active high/low open drain Healthy output. Active when all

programmed power supply inputs and monitored inputs are within OV and

UV limits.

OUT

RST

Programmable active high/low open drain Reset output. Active when a

programmed fault condition exists on any power supply inputs or monitored

inputs or when MR is active. RST has a programmable timeout period with

options for 0.64ms, 25ms, 100ms and 200ms.

AIN1

General purpose monitored analog input

AIN2

General purpose monitored analog input

12, 44,

39, 34,

29, 24,

GND

Ground

VREF_ADC

Voltage reference input used for A/D conversion where:

(4XVREF_ADC) = Full Scale for VMA-F and VDD

(12XVREF_ADC) = FS for 12VIN

(2XVREF_ADC) = FS for AIN1 and AIN2.

VREF_ADC can be connected to VREF_CNTL in most applications.

VREF_OUT

Voltage reference output for the internal 1.25V reference.

41,36,

31,26,

21,16

VMX

Monitored voltage input, VMA through VMF

PIN DESCRIPTIONS

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