TC3402 datasheet(5/16 Pages) MICROCHIP

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DS21411B-page 5

TC3402

2.0

PIN DESCRIPTIONS

Thedescriptionsof the pins arelistedinTable2-1.

TABLE 2-1:

PIN FUNCTION TABLE

Pin No.

(16-Pin PDIP)

(16-Pin QSOP)

Symbol

Description

IN1+

Analog Input. This is the positive terminal of a true differential input consisting of IN1+ and IN1-.

VIN1 = (IN1+ – IN-). See Section 1.0, Electrical Characteristics.

IN1-

Analog Input. This is the negative terminal of a true differential input consisting of IN1+ and IN1-.

VIN1 = (IN+ – IN-) IN1- can swing to, but not below, ground. See Section 1.0, Electrical Characteristics.

IN2+

Analog Input. This is the positive terminal of a true differential input consisting of IN2+ and IN2-.

VIN2 = (IN2+ – IN-). (See Section 1.0, Electrical Characteristics.)

IN2-

Analog Input. This is the negative terminal of a true differential input consisting of IN2+ and N2-.

VIN2 = (IN+ – IN-) IN2- can swing to, but not below, ground. See Section 1.0, Electrical Characteristics.

IN3+

Analog Input. This is the positive terminal of a true differential input consisting of IN3+ and IN3-.

VIN3 = (IN3+ – IN-). See Section 1.0, Electrical Characteristics.

IN3-

Analog Input. This is the negative terminal of a true differential input consisting of IN3+ and IN3-.

VIN3 = (IN+ – IN-) IN1- can swing to, but not below, ground. See Section 1.0, Electrical Characteristics.

7REFIN

Analog Input. The converter’s reference voltage is the differential between this pin and ground times

two. It maybetieddirectlytoREFOUT or scaled using a resistor divider. Any user supplied reference

voltagelessthan 1.25V maybeusedinplace of REFOUT.

GND

Ground Terminal.

9REFOUT Analog Output. The internal reference connects to this pin. It may be scaled externally and tied to the

REFIN input to provide the converter’s reference voltage. Care must be taken in connecting external

circuitrytothispin.

SDAT

Digital Output (push-pull). This is the microPort™ serial data output. SDAT is driven low while the

TC3402 is converting data, effectively providing a “busy” signal. After the conversion is complete,

every high to low transition on the SCLK pin puts a bit from the resulting data word on the SDAT pin

(from MSB to LSB).

IN4-

Analog Input. This is the negative terminal of a true differential input consisting of IN4+ and IN4-.

VIN4 = (IN+ – IN-) IN4- can swing to, but not below, ground. See Section 1.0, Electrical Characteristics.

IN4+

Analog Input. This is the positive terminal of a true differential input consisting of IN4+ and IN4-.

VIN4 = (IN4+ – IN-). See Section 1.0, Electrical Characteristics.

Digital Input. Controls analog multiplexer in conjunction with A0 to select one of the four Input

channels. This address is latched at the falling edge of the SCLK, which starts an A/D conversion.

A1, A0 = 00 = Input 1; 01 = Input 2; 10 = Input 3; 11 = Input 4.

Digital Input. Controls analog multiplexer in conjunction with A1 to selec one of four Input

channels. This address is latched at the falling edge of the SCLK, which starts an A/D conversion.

A1, A0 = 00 = Input 1; 01 = Input 2; 10 = Input 3; 11 = Input 4.

SCLK

Digital Input. This is the microPort™ serial clock input. The TC3402 comes out of Sleep mode and a

conversion cycle begins when this pin is driven low. After the conversion starts, each additional falling

edge (up to six) detected on SCLK for t4 seconds reduces the A/D resolution by one bit. When the

conversion is complete, the data word can be shifted out on the SDAT pin by clocking the SCLK pin.

VDD

Power Supply Input.

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