TC530 datasheet(2/22 Pages) MICROCHIP

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TC530/TC534

DS21433B-page 2

General Description

The TC530/TC534 are serial analog data acquisition

subsystems ideal for high precision measurements (up

to 17-bits plus sign). The TC530 consists of a dual

slope integrating

A/D converter, negative power sup-

ply generator and 3 wire serial interface port. The

TC534 is identical to the TC530, but adds a four chan-

nel differential input multiplexer. Key A/D converter

operating parameters (Auto Zero and Integration time)

are

programmable,

allowing

the

user

trade

conversion time for resolution.

Data conversion is initiated when the RESET input is

brought low. After conversion, data is loaded into the

output shift register and EOC is asserted, indicating

new data is available. The converted data (plus Over-

range and polarity bits) is held in the output shift regis-

ter until read by the processor or until the next

conversion is completed, allowing the user to access

data at any time.

The TC530/TC534 timebase can be derived from an

external crystal of 2MHz (max) or from an external fre-

quency source. The TC530/TC534 requires a single 5V

power supply and features a -5V, 10mA output which

can be used to supply negative bias to other

components in the system.

Typical Application

A0 A1

OSCIN

R/W

DIN

DOUT

DCLK

OSCOUT

OSC

RESET

CAP+

CAP–

CAZ

TC530

TC534

CREF

RINT

CINT

TC534

(Only)

(TC530 Only)

DC-TO-DC

Converter

State

Machine

Serial Port

Negative

Supply Output

Oscillator

(÷ 4)

Dual Slope A/D Converter

.01

µF

0.01

µF

Optional

Power-On

Reset Cap

100k

+5V

DIF.

MUX

(TC534

Only)

CMPTR

BUF

INT

CAZ

ACOM

VDD

VSS

MCP1525

VREF-

VREF+

VIN-

VIN+

EOC

CH2+

CH3+

CH1+

CH4+

CH4-

CH3-

CH2-

CH1-

IN+

IN-

CREF-

CREF+

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