CAT4016Y-T2 ON Semiconductor, CAT4016Y-T2 Datasheet - Page 9

• Manufacturer Part Number: CAT4016Y-T2
• Description: IC LED DRIVER LINEAR 24-TSSOP
• Manufacturer: ON Semiconductor
• Type: Linear (Serial Interface)r

Specifications of CAT4016Y-T2

• Constant Current: Yes
• Topology: PWM
• Number Of Outputs: 16
• Internal Driver: Yes
• Type - Primary: General Purpose
• Frequency: 25MHz
• Voltage - Supply: 3 V ~ 5.5 V
• Voltage - Output: 0.4 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 80mA
• Internal Switch(s): No
• Number Of Digits: 16
• Number Of Segments: 16
• High Level Output Current: 150 mA
• Operating Supply Voltage: 3 V to 5.5 V
• Maximum Supply Current: 100 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Efficiency: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: CAT4016Y-T2TR

Block Diagram
Basic Operation
accurately regulate the LED current in each channel. The
external resistor, R
current to 50 times the current in R
a wide range of input and LED voltages due to independent
current sensing circuitry on each channel. The LED
channels have a maximum dropout of 0.4 V for most current
and supply voltage conditions. This helps improve the heat
dissipation and efficiency of the LED driver.
all latches and shift registers and sets all outputs to off. Once
the under−voltage lockout threshold has been reached the
device can be programmed.
output channel by 17 ns (typical). Relative to LED1, LED2
is delayed by 17 ns, LED3 by 34 ns and LED16 by 250 ns
typical. The delay is introduced when LATCH is activated.
The delay minimizes the inrush current on the LED supply
by staggering the turn on and off current spikes over a period
of time and therefore allowing usage of smaller bypass
capacitors.
The CAT4016 uses 16 tightly matched current sinks to
Tight current regulation for all channels is possible over
Upon power−up, an under−voltage lockout circuit clears
The driver delays the activation of each consecutive LED
VIN
LED current + 50
BLANK
LATCH
SET
VDD
CLK
SIN
, is used to set the LED channel
SET
Figure 17. CAT4016 Functional Block Diagram
R
LED1 LED2 LED3
1.2
.
S1
SET
L1
S2
L2
L3
S3
http://onsemi.com
REGISTER
CURRENT
LATCHES
SINKS
SHIFT
9
set the state of the BLANK and LATCH pins to the off−state
when not externally driven.
Serial Interface
program the state of each LED on or off. The interface
contains a 16−bit serial to parallel shift register (S1−S16)
and a 16−bit latch (L1−L16). Programming the serial to
parallel register is accomplished via SIN and CLK input
pins. On each rising edge of the CLK signal, the data from
SIN is moved through the shift register serially. Data is also
moved out of SOUT which can be connected to a next device
if programming more than one device on the same interface.
serial to parallel shift register is reflected in the latches. On
the falling edge of LATCH, the state of the serial to parallel
register at that particular time is saved in the latches and does
not change irrespective of the contents of the serial to
parallel register.
simultaneously while maintaining the same data in the latch
register. When low, the LED outputs reflect the data in the
latches. When high, all outputs are high impedance (zero
current).
Pull−up and pull−down resistors are internally provided to
A high−speed serial 4−wire interface is provided to
On the rising edge of LATCH, the data contents of the
BLANK is used to disable all LEDs (turn off)
LED16
S16
L16
1.2 V Ref
Current
Setting
+
RSET
GND
SOUT