TC500 datasheet(7/38 Pages) MICROCHIP

7 / 38 page

DS21428E-page 7

TC500/A/510/514

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

TC500,

TC500A

TC510

TC514

Symbol

Function

CERDIP,

PDIP, SOIC

CINT

Integrator output. Integrator capacitor connection.

Not Used

VSS

Negative power supply input (TC500/TC500A only).

CAZ

Auto-zero input. The auto-zero capacitor connection.

BUF

Buffer output. The Integrator capacitor connection.

ACOM

This pin is grounded in most applications. It is recommended that

ACOM and the input common pin (Ven- or CHn-) be within the analog

Common Mode Range (CMR).

CREF-

Input. Negative reference capacitor connection.

CREF+

Input. Positive reference capacitor connection.

VREF-

Input. External voltage reference (-) connection.

VREF+

Input. External voltage reference (+) connection.

Not Used

VIN-

Negative analog input.

Not Used

VIN+

Positive analog input.

Input. Converter phase control MSB. (See input B.)

Input. Converter phase control LSB. The states of A, B place the

TC5XX in one of four required phases. A conversion is complete

when all four phases have been executed:

Phase control input pins: AB =

00: Integrator zero

01: Auto-zero

10: Integrate

11: De-integrate

CMPTR OUT Zero crossing comparator output. CMPTR is high during the

integration phase when a positive input voltage is being integrated

and is low when a negative input voltage is being integrated. A high-

to-low transition on CMPTR signals the processor that the De-

integrate phase is completed. CMPTR is undefined during the auto-

zero phase. It should be monitored to time the integrator zero phase.

DGND

Input. Digital ground.

VDD

Input. Power supply positive connection.

—

CAP+

Input. Negative power supply converter capacitor (+) connection.

—

CAP-

Input. Negative power supply converter capacitor (-) connection.

—1

VOUT-

Output. Negative power supply converter output and reservoir

capacitor connection. This output can be used to power other

devices in the circuit requiring a negative bias voltage.

—

OSC

Oscillator control input. The negative power supply converter

normally runs at a frequency of 100 kHz. The converter oscillator

frequency can be slowed down (to reduce quiescent current) by

connecting an external capacitor between this pin and VDD (see

Section 2.0 “Typical Performance Curves”

—

CH1+

Positive analog input pin. MUX channel 1.

—

CH1-

Negative analog input pin. MUX channel 1.

—

CH2+

Positive analog input pin. MUX channel 2.

—

CH2-

Negative analog input pin. MUX channel 2.

—

CH3+

Positive analog input pin. MUX channel 3.

—

CH3-

Negative analog input pin. MUX channel 3.

—

CH4+

Positive analog input pin. MUX channel 4.

—

CH4-

Negative analog input pin. MUX channel 4

—

Multiplexer input channel select input LSB (see A1).

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