CAT4016, CAV4016

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Table 5. PIN DESCRIPTION

Name

Function

GND

Ground

SIN

Serial data input pin

CLK

Serial clock input pin

LATCH

Latch serial data to output registers

LED1−LED16

LED channel 1 to 16 cathode terminals

BLANK

Enable / disable all channels

SOUT

Serial data output pin.

RSET

LED current set pin

VDD

Positive supply Voltage

TAB (TQFN package only)

Connect to GND on the PCB

Pin Function

GND is the ground reference pin for the device. This pin

must be connected to the ground plane on the PCB.

SIN is the serial data input. Data is loaded into the internal

register on each rising edge of CLK.

CLK is the serial clock input. On each rising CLK edge, data

is transferred from SIN to the internal 16−bit serial shift

register.

LATCH is the latch data input. On the rising edge of

LATCH, data is loaded from the 16−bit serial shift register

into the output register latch. On the falling edge, this data

is latched in the output register and isolated from the state of

the serial shift register.

LED1 – LED16 are the LED current sink channels. These

pins are connected to the LED cathodes. The current sinks

drive the LEDs with a current equal to 50 times RSET pin

current. For the LED sink to operate correctly, the voltage on

the LED pin must be above 0.4 V.

BLANK is the LED channel enable and disable input pin.

When low, LEDs are enabled according to the output latch

register content. When high, all LEDs are off, while

preserving the data in the output latch register.

SOUT is the serial data output of the 16−bit serial shift

register. This pin is used to cascade several devices on the

serial bus. The SOUT pin is then connected to the SIN input

of the next device on the serial bus to cascade.

RSET is the LED current setting pin. A resistor is connected

between this pin and ground. Each LED channel current is

set to 50 times the current pulled out of the pin. The RSET

pin voltage is regulated to 1.2 V.

VDD is the positive supply pin voltage for the entire device.

A small 1

mF ceramic is recommended close to pin.