© 2002 Microchip Technology Inc.

DS21433B-page 9

TC530/TC534

FIGURE 3-2:

SERIAL PORT TIMING

FIGURE 3-3:

A/D CONVERTER TIMING

3.3

Input Integrate Phase (INT)

In this phase, a current directly proportional to differen-

tial input voltage is sourced into integrating capacitor

of the INT phase is directly proportional to the applied

differential input voltage. Input signal polarity (sign bit)

is determined at the end of this phase. Converter

resolution and speed is a function of the duration of the

INT phase, which is programmable by the user via the

serial port (see Section 4.1.1, AZ and INT Phase Dura-

tion). The shorter the integration time, the faster the

speed of conversion (but the lower the resolution).

Conversely, the longer the integration time, the greater

the resolution (but at slower the speed of conversion).

R/W

Read Timing

Read Format

Write Format

Write Timing

Write Default Timing

EOC

DCLK

R/W

EOC

EOC

SGN MSB

LSB

OVR

R/W

R/W

MSB

LSB

For Polled vs Interrupt Operation and Write Value Modified Cycle Use TC520A Data Sheet (DS21431).

R/W

EOC

AZ

Updated Data

Ready

Updated Data

Ready

INT

DINT

IZ

AZ

Conversion

Phase

Data to Serial

Port Transmit

Register