PR4010.PDF

LED DRIVER PR4010

10-Channel LED Driver PR4010

The PR4010 is a 10 channel constant current driver with serial interface for LED display

applications. The LED current is programmable via an external resistor.

It can be used for single lines of LED, as well as for matrix displays.

The device is available in a 20-pin SSOP package.

Features Applications

• 10 constant current sink channels • LED status displays

• Supply voltage 5V • Bargraph displays

• Serial interface, shift register with latch • Indicator signs

• External brightness control • Instrument displays

• Current output with max. sink current of 10mA • LED matrix text displays

• Cascadable

Typical Application

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LED DRIVER PR4010

Pin Configurations

OUT

SEG9

Package SSOP-20

LOAD

SEG8

Topside marking:

version code "PR4010" or "PR4001"

Vcc

SEG7

CLK

SEG6

BRT

SEG5

Vee

SEG4

Blank

SEG3

CTRL

13 SEG2

DIN

12 SEG1

n.c.

11 SEG0

Pin Description

Pin No Pin Name Pin Function Description

OUT Output of SEG9 shift register flipflop, for cascading several PR4010

Load Serial interface: load signal (data latched from shift register to output flipflop)

Vcc Positive supply voltage

CLK Serial Interface: clock signal

BRT Output current setting

Vee Negative supply voltage

Blank Pulled to HIGH: sets the output current to zero; LOW or open: normal operation

CTRL Open or pulled to HIGH: no function; LOW: inverts DIN signal

DIN Serial interface: data input

n.c. Not connected

SEG0 Segment 0 output

SEG1 Segment 1 output

SEG2 Segment 2 output

SEG3 Segment 3 output

SEG4 Segment 4 output

SEG5 Segment 5 output

SEG6 Segment 6 output

SEG7 Segment 7 output

SEG8 Segment 8 output

SEG9 Segment 9 output

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LED DRIVER PR4010

Absolute Maximum Ratings

Parameter

Min Max Units

Maximum voltage at all pins (except BRT)

-0.3

Maximum sink current through pins Seg0..Seg9

Operating junction temperature range

-20

125

°C

Storage temperature range

-55

150

°C

Electrostatic discharge (ESD) protection

Electrical Characteristics

V CC =5 VDC, Ta = 25°C (unless otherwise noted)

Symbol

Parameter

Conditions Min Typ Max Units

V CC

Supply voltage range

I LEDmax = 5mA

I LEDmax = 10mA

3.3

4.7

5.5

I CC

IC supply current

all outputs off

all outputs on

0.5

1.0

n/a

2.0

I LED

Current through pins

Seg0..Seg9

Vcc=5V,

Vout=0.8V

R Brt =80 kOhm

I LED

Current through pins

Seg0..Seg9

Vcc=5V,

Vout=0.6V

R Brt =182 kOhm

2.5

I LED

Current through pins

Seg0..Seg9

Vcc=5V,

Vout=0.3V

R Brt =424 kOhm

Δ I LED LED current matching

I LED =2.5mA

-5

V POR Power on reset voltage

1.7

V IH

V IL

R PullUp

Logic input voltage High

Logic input voltage Low

Internal pull-up resistor from Vcc

DIN, CLK,

LOAD, CTRL

2.2

kΩ

1.4

100

V IH

V IL

R PullUp

Logic input voltage High

Logic input voltage Low

Internal pull-up resistor from Vcc

BLANK

2.2

kΩ

1.4

none

I L

Sink current Low

OUT

0.5

V BRT

Reference voltage at BRT

1.17 1.20 1.23

R BRT

Range of external resistance at

BRT pin

1000 kΩ

Θ JA

Thermal resistance

junction-ambient

SSOP-20

package, no air

convection

160

°C/W

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LED DRIVER PR4010

Block Diagram

Functional Description

The PR4010 is a 10-channel LED driver with serial interface, controllable current sinks

and common output current control.

Power-on reset: As long as the supply voltage is below V POR , all latches are set to '0', and

the output drivers are off.

DIN, CLK, LOAD: The serial interface consists of 10 positive-edge-triggered D-type

flipflops and input signals DIN (data bits), CLK (clock) and LOAD (transfer data from shift

BRT: The reference current for the output drivers is set by a resistor between BRT and

V EE . BRT is held on reference voltage V BRT .

BLANK: If BLANK is set to '1', all output drivers will be set to zero output current. This will

not affect the logic state of shift register or latch. It can be used e.g. for blinking or PWM

brightness control. This input does not have an internal pull-up resistor. It can be open or

pulled to LOW for normal operation.

OUT: The logic output OUT assumes the logic state of the output of the SEG9 flipflop. By

connecting OUT with DIN of another IC, several PR4010 can be chained.

CTRL: The CTRL signal can invert the logic polarity of the DIN signal, to provide

compatibility to certain applications. If CTRL is open or 'HIGH', the signal is processed in

the normal way; if CTRL is 'LOW', the DIN signal is internally inverted. In the latter case

also the OUT signal is inverted against the DIN data at the respective bit position, so if

several PR4010 are cascaded, only the CTRL input of the first IC in the chain should be

activated to avoid a double inversion.

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LED DRIVER PR4010

Communication

Typical sequence of the signal to control all 10 segments is shown in the following

diagram.

The DIN signal is read at each positive edge of the CLK signal.

Signal timing is represented in following table:

Symbol

Parameter

Min

Typ Max Units

t cl ‘Clock’ signal low level hold time

0.5

µs

t ch ‘Clock’ signal high level hold time

0.5

µs

t ws ‘Write bit’ setup time

(time between DIN is valid and CLK positive edge)

0.2

t cl -0.2 µs

t wh ‘Write bit’ hold time

(time during which DIN is valid and unchanged)

t ch +0.2

t ch +t cl -0.2 µs

t ld ‘Load’ signal delay

(time between CLK positive edge for last bit to be

transmitted and LOAD positive edge)

0.5

µs

t lh ‘Load’ signal hold time

0.5

µs

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