© 2002 Microchip Technology Inc.

DS21428B-page 5

TC500/A/510/514

2.0

PIN DESCRIPTIONS

Thedescriptionsof the pins arelistedinTable2-1.

TABLE 2-1:

PIN FUNCTION TABLE

Pin Number

(TC500,

TC500A)

Pin

Number

(TC510)

Pin

Number

(TC514)

Symbol

Description

12

2

Integrator output. Integrator capacitor connection.

2

Not Used Not Used

Negative power supply input (TC500/TC500A only).

33

3

Auto Zero input. The Auto Zero capacitor connection.

4

4

4

BUF

Buffer output. The Integrator capacitor connection.

5

5

5

ACOM

This pin is grounded in most applications. It is recommended that ACOM and the

66

6

Input. Negative reference capacitor connection.

77

7

Input. Positive reference capacitor connection.

88

8

Input. External voltage reference (-) connection.

99

9

Input. External voltage reference (+) connection.

10

15

Not Used

Negative analog input.

11

16

Not Used

Positive analog input.

12

18

22

A

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

13

17

21

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

14

19

23

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 pro-

cessor 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.

15

23

27

DGND

Input. Digital ground.

16

21

25

Input. Power supply positive connection.

22

26

CAP+

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

24

28

CAP-

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

11

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.

20

24

OSC

Oscillator control input. The negative power supply converter normally runs at a fre-

quency of 100kHz. The converter oscillator frequency can be slowed down

(to reduce quiescent current) by connecting an external capacitor between this pin

18

CH1+

Positive analog input pin. MUX channel 1.

13

CH1-

Negative analog input pin. MUX channel 1.

17

CH2+

Positive analog input pin. MUX channel 2.

12

CH2-

Negative analog input pin. MUX channel 2.

16

CH3+

Positive analog input pin. MUX channel 3.

11

CH3-

Negative analog input pin. MUX channel 3.

15

CH4+

Positive analog input pin. MUX channel 4.

10

CH4-

Negative analog input pin. MUX channel 4

20

A0

Multiplexer input channel select input LSB (see A1).

19

A1

Multiplexer input channel select input MSB.

Phase control input pins: A1, A0 = 00 = Channel 1

01 = Channel 2

10 = Channel 3

11 = Channel 4