© 2002 Microchip Technology Inc.

DS21431B-page 1

TC520A

Features

• Converts TC500/TC500A/TC510/TC514 to Serial

Operation

• Programmable Conversion Rate and Resolution for

Maximum Flexibility

• Supports up to 17-Bits of Accuracy Plus Polarity Bit

• Low Power Operation: Typically 7.5m

Ω

• 14-Pin PDIP or 16-Pin SOIC Packages

• Polled or Interrupt Mode Operation

Applications

• Computer Peripheral Interface

• Portable Instruments

• Data Acquisition System Interface

Device Selection Table

Package Type

General Description

The TC520A serial interface adapter provides logic

control for Microchip's TC500/TC500A/TC510/TC514

family of dual slope, integrating A/D converters. It

directly manages TC500 converter phase control sig-

nals A, B and CMPTR, thereby reducing host

processor task loading and software complexity. Com-

munication with the TC520A is accomplished over a 3

wire serial port. Key converter operating parameters

are programmable for complete user flexibility. Data

conversion is initiated when the CE input is brought

low. The converted data (plus overrange and polarity

bits) are held in an 18-bit shift register until read by the

processor or until the next conversion is completed.

Data may be clocked out of the TC520A at any time,

and at any rate, the user prefers. A Data Valid (DV)out-

put is driven active at the start of each conversion

cycle, indicating the 18-bit shift register update has just

been completed. This signal may be polled by the pro-

cessor or can be used as data ready interrupt. The

TC520A timebase can be derived from an external fre-

quency source of up to 6MHz or can operate from its

own external crystal. It requires a single 5V logic supply

and dissipates less than 7.5m

Ω.

Part Number

Package

Temperature Range

TC520ACOE 16-Pin SOIC (Wide)

0

°Cto +70°C

TC520ACPD

14-Pin PDIP

0

°Cto +70°C

B

CMPTR

DGND

A

DCLK

114

213

312

411

510

69

78

TC520A

CE

DV

LOAD

READ

14-Pin PDIP

16-Pin SOIC

8

1

2

3

4

5

6

7

TC520A

B

14

13

12

11

10

9

15

16

LOAD

DV

CE

DCLK

A

READ

N/C

CMPTR

DGND

N/C

Serial Interface Adapter for TC500 A/D Converter Family