Macroblock, Inc. 2003

Floor 6-4, No.18, Pu-Ting Rd., Hsinchu, Taiwan 30077, ROC.

TEL: +886-3-579-0068, FAX: +886-3-579-7534 E-mail:

info@mblock.com.tw

- 1 -

Macroblock

Preliminary Datasheet

MBI5027

16-bit Constant Current LED Sink Driver

with Error Detection

Features

Error Detection mode to detect LED open-circuit errors

16 constant-current output channels

Constant output current invariant to load voltage change

Excellent output current accuracy:

between channels:

3% (max.), and

between ICs:

6% (max.)

Output current adjusted through an external resistor

Constant output current range: 5-90 mA

Fast response of output current,

(min.): 200 ns

25MHz clock frequency

Schmitt trigger input

5V supply voltage

Current Accuracy

Between Channels

Between ICs

Conditions

OUT

= 10 mA ~ 60 mA

MBI5016CP

MBI5016CF

MBI5016CNS

MBI5027CNS

MBI5027CP

MBI5027CF

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 2 -

Product Description

MBI5027 succeeds MBI5026 and is designed for LED displays with open-circuit Error Detection
extension. MBI5027 exploits PrecisionDrive

technology to enhance its output characteristics.

MBI5027 contains a serial buffer and data latches, which convert serial input data into parallel
output format. At MBI5027 output stage, sixteen regulated current ports are designed to provide
uniform and constant current sinks for driving LEDs within a wide range of Vf variations.

While MBI5027 is used in their system design for LED display applications, e.g. LED panels, it
provides users with great flexibility and device performance. Users may adjust the output
current from 5 mA to 90 mA through an external resistor, R

ext

, which gives users flexibility in

controlling the light intensity of LEDs. MBI5027 guarantees to endure maximum 17V at the
output port. The high clock frequency, 25 MHz, also satisfies the system requirements of high
volume data transmission.

MBI5027 exploits the idea of Share-I-O

technology to extend its performance

in addition,

MBI5027 is backward compatible with MBI5026 in both electrical characteristics and package
aspect. With Share-I-O

technology, users can, without changing the printed circuit board

originally for MBI5026, let MBI5027 enter a special function mode, an Error Detection mode,
just by setting a sequence of signals on LE(ED1),

(ED2) and CLK input pins. In the Error

Detection mode, MBI5027 detects the status of individual LED connected to MBI5027. The
status will be saved in a built-in register. Then, a system controller may read, through SDO pin,
the error status from the register to know whether LEDs are properly lit or not. By setting
another sequence of signals on LE(ED1),

(ED2) and CLK input pins, MBI5027 may resume

to a Normal mode and perform as MBI5026. In Application Information, users can get
detailed ideas about how MBI5027 works in the Error Detection mode.

A Share-I-O

technique is specifically applied to MBI5027. By means of the Share-I-O

technique, an additionally effective function, Error Detection, can be added to LED drivers,
however, without any extra pins. Thus, MBI5027 could be a drop-in replacement of MBI5026.
The printed circuit board originally designed for MBI5026 may be also applicable for MBI5027.

For MBI5027, the pin 4, LE(ED1), and the pin 21, OE (ED2), can be acted as different functions
as follows:

Pin

Device Name

MBI5027

Function Description of Pin 4

LE + Error Detection (ED1)

Function Description of Pin 21

OE + Error Detection (ED2)

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 3 -

GND

SDI

CLK

LE(ED1)

OUT7

OE(ED2)

SDO

R-EXT

VDD

OUT8

OUT6

OUT5

OUT4

OUT3

OUT2

OUT1

OUT0

OUT9

OUT10

OUT11

OUT12

OUT13

OUT14

OUT15

Block Diagram

Terminal Description

Pin No.

Pin Name

Function

GND

Ground terminal for control logic and
current sink

SDI

Serial-data input to the Shift Register

CLK

Clock input terminal for data shift on
rising edge

LE(ED1)

Data strobe input terminal

Serial data is transferred to the
respective latch when LE(ED1) is high.
The data is latched when LE(ED1)
goes low.
Also, a control signal input for Error
Detection mode (See Timing Diagram)

5~20

OUT0 ~ OUT15 Constant current output terminals

OE (ED2)

Output enable terminal

When (active) low, the output drivers
are enabled; when high, all output
drivers are turned OFF (blanked).
Also, a control signal input for Error
Detection mode (See Timing Diagram)

SDO

Serial-data output to the following SDI
of next driver IC

R-EXT

Input terminal used to connect an
external resistor for setting up all output
current

VDD

5V supply voltage terminal

Pin Configuration

16-bit Shift Register

16-bit Output Latch

Regulator

Output Driver & Error Detector

Control Logic

R-EXT

SDI

CLK

SDO

GND

VDD

LE(ED1)

OUT0

OUT

OUT14

OUT15

)

(

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 5 -

Timing Diagram

Normal Mode

Truth Table (In Normal Mode)

CLK

SDI

OUT0 ...

OUT ... OUT15

SDO

...

n-15

n+1

No Change

n-14

n+2

...

n-13

n+3

...

n-13

n+3

Off

n-13

CLK

SDI

N = 0

1 2

3 4

5 6

7 8

9 10

11 12

13 14 15

LE(ED2)

OFF
ON

OFF

OFF
ON

SDO

: don

t care

)

(

OUT0

OUT

OUT2

OUT3

OUT15

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 6 -

Entering Error Detection Mode

The signal sequence makes MBI5027 enter an Error Detection mode.

Reading Error Status Code

A system controller can read Error Status codes through SDO pin.

Resuming to Normal Mode

The signal sequence makes MBI5027 resume to the Normal mode.

Note:
If users want to know the whole process, that is how to enter the Error Detection mode, read Error
Status codes and resume to the Normal mode, please refer to the contents in Application Information.

: don

t care

about 2

Bit15 Bit14

Error Status Code

Bit13 Bit12 Bit11

CLK

SDO

(ED2)

LE(ED1)

CLK

1 2

3 4 5

)

(

CLK

LE(ED1)

1 2

3 4 5

Voltage

Low

)

(

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 7 -

Maximum Ratings

Characteristic

Symbol

Rating

Unit

Supply Voltage

0~7.0

Input Voltage

-0.4~V

+ 0.4

Output Current

OUT

+90

Output Voltage

-0.5~+20.0

Clock Frequency

CLK

MHz

GND Terminal Current

GND

1440

CNS

type

1.52

type

1.30

Power Dissipation
(On PCB, Ta=25

type

1.11

CNS

type

Thermal Resistance
(On PCB, Ta=25

type

th(j-a)

112

C/W

Operating Temperature

opr

-40~+85

Storage Temperature

stg

-55~+150

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 8 -

Recommended Operating Conditions

Characteristic

Symbol

Condition

Min.

Typ.

Max.

Unit

Supply Voltage

4.5

5.0

5.5

Output Voltage

OUT0 ~ OUT15

17.0

OUT

DC Test Circuit

SDO

-1.0

Output Current

SDO

1.0

CLK, OE (ED2),

LE(ED1) and SDI

0.8V

+0.3

Input Voltage

CLK, OE (ED2),

LE(ED1) and SDI

-0.3

0.3V

LE(ED1) Pulse Width

w(L)

CLK Pulse Width

w(CLK)

OE (ED2) Pulse Width

w(OE)

200

Setup Time for SDI

su(D)

Hold Time for SDI

h(D)

Setup Time for LE(ED1)

su(L)

Hold Time for LE(ED1)

h(L)

Normal Mode

=4.5~5.5V

OE (ED2) Pulse Width

w(ED2)

CLK Pulse Width

w(CLK)

Setup Time for LE(ED1)

su(ED1)

Hold Time for LE(ED1)

h(ED1)

Setup Time for OE (ED2)

su(ED2)

Hold Time for OE (ED2)

h(ED2)

Error Detection Mode

=4.5~5.5V

Clock Frequency

CLK

Cascade Operation

25.0

MHz

Ta=85

C (CNS type)

0.79

Ta=85

C (CF type)

0.67

Power Dissipation

Ta=85

C (CP type)

0.57

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 9 -

Electrical Characteristics

Characteristic

Symbol

Condition

Min.

Typ.

Max.

Unit

level

Ta = -40~85

0.8V

Input

Voltage

level

Ta = -40~85

GND

0.3V

Output Leakage Current

=17.0V

0.5

=+1.0mA

0.4

Output

Voltage

SDO

=-1.0mA

4.6

Output Current 1

OUT1

=0.6V

ext

=720

25.0

Current Skew

OUT1

=25mA

=0.6V

ext

=720

Output Current 2

OUT2

=0.8V

ext

=360

50.0

Current Skew

OUT2

=50mA

=0.8V

ext

=360

Output Current vs.
Output Voltage Regulation

%/dV

within 1.0V and 3.0V

0.1

% / V

Output Current vs.
Supply Voltage Regulation

%/dV

within 4.5V and 5.5V

% / V

Pull-up Resistor

(up)

OE (ED2)

250

500

800

Pull-down Resistor

(down)

LE(ED1)

250

500

800

DS, Th1

When all output ports sink 20mA

simultaneously

1.0

DS, Th2

When a single output port sinks

20mA

0.8

DS, Th3

When all output ports sink 50mA

simultaneously

1.2

Open Circuit Error***

Discrimination Voltage

DS, Th4

When a single output port sinks

50mA

1.0

(off) 1 R

ext

=Open, OUT0 ~ OUT15 =Off

(off) 2 R

ext

=720

OUT0 ~ OUT15 =Off

OFF

(off) 3 R

ext

=360

OUT0 ~ OUT15 =Off

(on) 1 R

ext

=720

, OUT0 ~ OUT15 =On

Supply

Current

(on) 2 R

ext

=360

, OUT0 ~ OUT15 =On

***

To effectively detect the error occurring at the output port, MBI5027 has a built-in current detection

circuit. The current detection circuit will detect the effective current I

OUT, effective

, and compare the effective

current I

OUT, effective

, to the target current I

OUT

, target

, defined by

ext

. If I

OUT, effective

, is much less than the

target current I

OUT

, target

, an error flag will be asserted in the built-in Shift Register. The minimum voltage

requirement for such current detection is V

DS, Th1

, V

DS, Th2

, V

DS, Th3

and V

DS, Th4

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 11 -

Switching Characteristics

Characteristic

Symbol Condition

Min.

Typ. Max.

Unit

CLK - OUTn

pLH1

100

LE(ED1) - OUTn

pLH2

100

OE (ED2) - OUTn

pLH3

100

Propagation Delay Time

(

)

CLK - SDO

pLH

CLK - OUTn

pHL1

100

150

LE(ED1) - OUTn

pHL2

100

150

OE (ED2) - OUTn

pHL3

150

Propagation Delay Time

(

)

CLK - SDO

pHL

CLK

w(CLK)

LE(ED1)

w(L)

Pulse Width

OE (ED2)

w(OE)

200

Hold Time for LE(ED1)

h(L)

Setup Time for LE(ED1)

su(L)

=5.0 V

=0.8 V

=GND

ext

=300

=4.0 V

=52

=10 pF

Maximum CLK Rise Time

500

Maximum CLK Fall Time

500

Output Rise Time of Iout

200

Output Fall Time of Iout

120

**If the devices are connected in cascade and t

or t

is large, it may be critical to achieve the timing required for

data transfer between two cascaded devices.

Test Circuit for Switching Characteristics

(ED2)

CLK

LE(ED1)

EXT

GND

SDO

OUT0

OUT15

.

.
.

Generator

Function

OUT

ref

IH,

waveform

input

Logic

SDI

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 14 -

Application Information

Constant Current

To design LED displays, MBI5027 provides nearly no variations in current from channel to

channel and from IC to IC. This can be achieved by:

1) The maximum current variation between channels is less than

3% and that between ICs is

less than

6%.

2) In addition, the current characteristic of output stage is flat and users can refer to the figure

as shown below. The output current can be kept constant regardless of the variations of LED
forward voltages (Vf). This performs as a complete function of the load regulation.

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.1

1.2

1.3

1.4

1.5

2.5

(V)

I
o
u
t

(
m

)

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 15 -

100

500

1000

1500

2000

2500

3000

3500

4000

Adjusting Output Current

The output current of each channel (I

OUT

) is set by an external resistor, R

ext

. The relationship

between I

out

and R

ext

is shown in the following figure.

Also, the output current in milliamps can be calculated from the equation:
I

OUT

is (625/ R

ext

) x 28.8, approximately,

where R

ext

, in

, is the resistance of the external resistor connected to R-EXT terminal.

The magnitude of current is around 50mA at 360

and 25mA at 720

Resistance of the external resistor, R

ext

, in

= 1.0V

OUT

(mA)

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 16 -

Entering Error Detection Mode

Each time the system controller sends the sequence patterns shown above, MBI5027 can enter
the Error Detection mode. During this phase, the system controller can still send data through
SDI pin.
The state of

(ED2) and LE(ED1) is sampled by the rising edge of each CLK. We use

and

to represent the state of

Voltage Low

and

Voltage High

respectively. The states of

the successive five

(ED2) and LE(ED1) are (1, 0), (0, 0), (1, 0), (1, 1) and (1, 0).

Reading Error Status Code

Once entering the Error Detection mode, the Error Detection takes place by changing the state
of

(ED2) from

Voltage High

Voltage Low

he built-in current detection circuit will

detect the effective current I

OUT, effective

of each output channel, and compare it to the target

current I

OUT, target

, defined by R

ext

If the I

OUT, effective

, is much less than the target current I

OUT, target

an error status code will be represented as

state.

During the period of detecting errors, data

cannot be sent into MBI5027 through SDI pin. The

Voltage Low

state of

(ED2) requires at

least three

of which the last

should be at least 2

s after the falling edge of

(ED2).

The occurrence of the last

results in the event that MBI5027 saves the error status in the

built-in register. The mentioned state of each

is sampled by the rising edge of each CLK.

Before the error status saved in the built-in register is read, the state of

(ED2) should be

pulled up from

Voltage Low

Voltage High

. Then, by sending CLK, MBI5027 shifts out,

through SDO pin, the error status bit by bit.

LE(ED1)

CLK

1 2

3 4 5

)

(

about 2

Bit15 Bit14

Error Status Code

Bit13 Bit12 Bit11

SDO

CLK

)

(

1 0

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 17 -

Resuming to Normal Mode

Each time the system controller sends the sequence patterns shown above, MBI5027 can
resume to the Normal mode. During this phase, the system controller can still send data
through SDI pin.
The state of

(ED2) and LE(ED1) is sampled by the rising edge of each CLK. We use

and

to represent the state of

Voltage Low

and

Voltage High

respectively. The states of

the successive five

(ED2) and LE(ED1) are (1, 0), (0, 0), (1, 0), (1, 0) and (1, 0).

CLK

LE(ED1)

1 2

3 4 5

Voltage

Low

)

(

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 18 -

Timing Chart for Error Detection Mode (An Example)

N x 16 -1

Serial Data (Note 1)

Resuming to the
Normal Mode

Entering the Error
Detection Mode

Sending the Normal Image Data (or Test Data)
Serial Data k, k = 0

...

(N x 16

Reading Back the Error Status Code

Detecting the Error Status

SDI, 0

N x 16

N x 16 CLK Pulses (Note 3)

N x 16 CLK Pulses (Note 1)

SDI, 0
N-1

SDI, 0

3 CLK Pulses Required (Note 2)

MBI5027, 0

N x MBI5027 are connected in cascade, ie, SDO, k --> SDI, k+1.
And, all MBI5027 ICs are connected to the same CLK, LE(ED1) and OE (ED2)
signals.

SDI, 0

SDO, 2

SDO, N-1
N-1

MBI5027, 1

MBI5027, 2

MBI5027, N-1

Note 2:
T1 = 2 CLK pluses is required to start the error detection.
T2 = 2

s is required to obtain the stable error status result.

T3 = the third CLK pulses is required before OE (ED2) goes
voltage high. The rising edge of CLK writes the error status code
back to the MBI5027 built-in shift register.

Note 3:
The first rising edge of CLK after the rising edge of OE (ED2) starts shifting the Image
Data with LED Error. An LED error will be represented by a

, to over write the

original image data

. Image Data k, k = 0

...

(N x 16

1), = all

is suggested.

N x 16 CLK pulses shift all N x 16 error results (Error Status Code) via Node SDO, N

Note 1: N x 16 CLK pulses before the
next LE shift the valid image data. N x
16

s are suggested.

LED j, j = 0

...

(N x16

Don

t Care

Could Be

Don

t Care

SDO, 1

SDI, 1

SDO, 0
N-1

SDO, 1

SDO, 0
N-1

T2 = 2

T1 = 2 CLK

T3 (Note 2)

h(L)

LE(ED1)

CLK

LE(ED1)

SDO, N-1
N-1

N x 16 -2

MBI5027, N-2

(ED2)

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 19 -

Package Power Dissipation (P

)

The maximum allowable package power dissipation is determined as P

(max) = (Tj

Ta) /

th(j-a)

. When 16 output channels are turned on simultaneously, the actual package power

dissipation is P

(act) = (I

x V

) + (I

OUT

x Duty x V

x 16). Therefore, to keep P

(act)

(max), the allowable maximum output current as a function of duty cycle is:

OUT

= { [ (Tj

Ta) / R

th(j-a)

]

x V

) } / V

/ Duty / 16,

where Tj = 150

(A) I

out

= 90mA, V

= 1.0V, 16 output channels active

For CNS type package, the thermal resistance is R

th(j-a)

= 82 (

C/W)

100

5
%

1
0
%

1
5
%

2
0
%

2
5
%

3
0
%

3
5
%

4
0
%

4
5
%

5
0
%

5
5
%

6
0
%

6
5
%

7
0
%

7
5
%

8
0
%

8
5
%

9
0
%

9
5
%

1
0
0
%

Duty Cycle

I
o
u
t

(
m

)

Ta = 25

Ta = 55

Ta = 85

Iout vs. Duty Cycle at Rth = 82 (

C/W)

For CF type package, the thermal resistance is Rth(j-a) = 96 (

C/W)

100

5
%

1
0
%

1
5
%

2
0
%

2
5
%

3
0
%

3
5
%

4
0
%

4
5
%

5
0
%

5
5
%

6
0
%

6
5
%

7
0
%

7
5
%

8
0
%

8
5
%

9
0
%

9
5
%

1
0
0
%

Duty Cycle

I
o
u
t

(
m

)

Ta = 25

Ta = 55

Ta = 85

Iout vs. Duty Cycle at Rth = 96 (

C/W)

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 20 -

For CP type package, the thermal resistance is R

th(j-a)

= 112 (

C/W)

Iout vs. Duty Cycle at Rth = 112 (

C/W)

100

5
%

1
0
%

1
5
%

2
0
%

2
5
%

3
0
%

3
5
%

4
0
%

4
5
%

5
0
%

5
5
%

6
0
%

6
5
%

7
0
%

7
5
%

8
0
%

8
5
%

9
0
%

9
5
%

1
0
0
%

Duty Cycle

I
o
u
t

(
m

)

Ta = 25

Ta = 55

Ta = 85

(B) I

out

= 60mA, V

= 0.8V, 16 output channels active

For CNS type package, the thermal resistance is R

th(j-a)

= 82 (

C/W)

Iout vs. Duty Cycle at Rth = 82 (

C/W)

5
%

1
0
%

1
5
%

2
0
%

2
5
%

3
0
%

3
5
%

4
0
%

4
5
%

5
0
%

5
5
%

6
0
%

6
5
%

7
0
%

7
5
%

8
0
%

8
5
%

9
0
%

9
5
%

1
0
0
%

Duty Cycle

I
o
u
t

(
m

)

Ta = 25

Ta = 55

Ta = 85

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 21 -

For CF type package, the thermal resistance is R

th(j-a)

= 96 (

C/W)

Iout vs. Duty Cycle at Rth = 96 (

C/W)

5
%

0
%

5
%

0
%

5
%

0
%

5
%

0
%

5
%

0
%

5
%

0
%

5
%

0
%

5
%

0
%

5
%

0
%

5
%

0
%

Duty Cycle

I
o
u

t

(
m

)

Ta = 25

Ta = 55

Ta = 85

For CP type package, the thermal resistance is R

th(j-a)

= 112 (

C/W)

Iout vs. Duty Cycle at Rth = 112 (

C/W)

5
%

1
0
%

1
5
%

2
0
%

2
5
%

3
0
%

3
5
%

4
0
%

4
5
%

5
0
%

5
5
%

6
0
%

6
5
%

7
0
%

7
5
%

8
0
%

8
5
%

9
0
%

9
5
%

0
0
%

Duty Cycle

I
o
u
t

(
m

)

Ta = 25

Ta = 55

Ta = 85

MBI5027

16-bit Constant Current LED Sink Driver with Error Detection

April 2003, V0.8-4

- 22 -

The maximum power dissipation, P

(max)

(Tj-Ta) / R

th(j-a)

, decreases as the ambient

temperature increases.

Max. Power Dissipation at Various Ambient Temperature

0.2

0.4

0.6

0.8

1.2

1.4

1.6

-40

-30

-20

-10

Ambient Temperature

o
w

e
r

D

i
s
s
i
p
a
t
i
o
n

CNS Type: Rth = 82

CF Type: Rth = 96

CP Type: Rth = 112

Load Supply Voltage (V

LED

)

MBI5027 are designed to operate with V

ranging from 0.4V to 1.0V considering the package

power dissipating limits. V

may be higher enough to make P

D(act)

> P

D(max)

when V

LED

= 5V

and V

= V

LED

Vf, in which V

LED

is the load supply voltage. In this case, it is recommended to

use the lowest possible supply voltage or to set an external voltage reducer, V

DROP

A voltage reducer lets V

= (V

LED

Vf)

DROP

Resistors or Zener diode can be used in the applications as the following figures.

LED

DROP

MBI5027

LED

DROP

MBI5027

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: MBI5027CP

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: MBI5027CP