X9470 datasheet(2/25 Pages) XICOR

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REV 11.16 3/20/03

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Preliminary Information

X9470

PIN CONFIGURATION

ORDERING INFORMATION

PIN DESCRIPTIONS

Part Number

Temperature Range

Package

X9470V24I

-40°C TO 85°C

24-Lead TSSOP

TSSOP pin

Symbol

Brief Description

1VSENSE+

Positive sense voltage input terminal

2RHREF

Upper Terminal of Potentiometer, called the RREF potentiometer. The voltage applied to this pin will determine the

upper voltage limit of the adjustment for the Up/Down threshold of the comparator.

3RLREF

Lower Terminal of Potentiometer, called the RREF potentiometer. The voltage applied to this pin will determine the

lower voltage limit of the adjustment for the Up/Down threshold of the comparator.

4RWREF

Wiper Terminal of Potentiometer, called the RREF potentiometer. The voltage on this pin will be the threshold for

the Up/Down comparator. Also referred to as the VREF of the comparator.

AGND

Analog ground to allow single point grounding external to the package to minimize digital noise.

VSS

System (Digital) Ground Reference

7CS

Chip Select. This input enables bias calibration adjustments to the RBIAS potentiometer. CMOS input with internal

pull-down.

SCL

Dual function. Function 1: The increment control input. Increments or decrements the RBIAS potentiometer.

Function 2: Serial Data Clock Input. Requires external pull-up.

SDA

Serial Data Input. Bi-directional 2-wire interface. Requires external pull-up.

RHBIAS

Upper Terminal of Potentiometer, called the RBIAS potentiometer. The voltage applied to this pin will determine the

upper limit of the bias voltage to the PA (or VBIAS pin).

RWBIAS

Wiper Terminal of Potentiometer, called the RBIAS potentiometer. This voltage is the equivalent to the unbuffered

voltage that will appear at the VBIAS pin.

RLBIAS

Lower Terminal of Potentiometer, called the RBIAS potentiometer. The voltage applied to this pin will determine the

lower limit of the bias voltage to the PA (or VBIAS pin).

External address pin which allows for a hardware slave address selection of this device.

This pin has an internal pull-down.

External address pin which allows for a hardware slave address selection of this device.

This pin has an internal pull-down.

External address pin which allows for a hardware slave address selection of this device.

This pin has an internal pull-down.

VSS

System (Digital) Ground Reference

VBIAS

This is the bias output voltage pin and is used to drive the filter network to the PA gate.

VCC

System (Digital) Supply Voltage

VCC

System (Digital) Supply Voltage

V +

Positive voltage supply for the instrumentation amplifier and other analog circuits.

VOUT

Instrumentation Amplifier output that is 20x or 50x the voltage across the Rsense pins.

INC/DEC

Status output that indicates the state of the comparator. When this pin is HIGH, the RBIAS potentiometer will in-

crement; when the pin is LOW, the RBIAS potentiometer will decrement. This pin is open drain and requires ex-

ternal resistor pull-up.

SHDN

Shutdown the output op amp. When SHDN is active (HIGH), the VBIAS pin is pulled LOW.

VSENSE-

Negative sense voltage Input terminal

VOUT

RWREF

V+

TSSOP

X9470

Vsense+

Vsense-

RHREF

RLREF

VSS

AGND

SHDN

INC/DEC

VCC

RHBIAS

VCC

SDA

SCL

VBIAS

VSS

RLBIAS

RWBIAS

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