TC3405 datasheet(5/16 Pages) MICROCHIP

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DS21414B-page 5

TC3405

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 with the negative input tied

internally to GND. See Section 1.0, Electrical Characteristics.

IN3

Analog Input. This is the positive terminal of a true differential input with the negative input tied

internally to GND. See Section 1.0, Electrical Characteristics.

IN4

Analog Input. This is the positive terminal of a true differential input with the negative input tied

internally to GND. See Section 1.0, Electrical Characteristics.

6VTH

Analog Input. This is the positive input to the internal comparator used to monitor the voltage supply.

The negative input is tied to an internal reference. When VTH falls below the internal reference, the

reset generator drives RESET low. 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 maybetieddirectly to REFOUT or scaled using a resistor divider. Any user supplied

reference voltage less than 1.25 may be used in place 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

circuitry to this pin. This pin is in a high impedance state during Sleep mode.

SDAT

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

TC3405 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).

ENABLE Digital Input. When this input control is pulled low, the part is internally restarted. That is, any data

conversion or data read sequence is cleared and the part goes into Sleep mode. When ENABLE

returns high, the part resumes normal operation.

RESET

Digital Output (open drain). This is the output of the VDD monitor reset generator. RESET is driven low

when a Power-on Reset or Brown-out condition is detected.

See Section 1.0, AC 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 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.

SCLK

Digital Input. This is the microPort™ serial clock input. The TC3405 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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