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
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Macroblock
Advance Information
MBI5169
8-bit Constant Current LED Sink Driver
with Error Detection
Features
l
Error Detection mode to detect individual LED open-circuit errors
l
8 constant-current output channels
l
Constant output current invariant to load voltage change
l
Excellent output current accuracy:
between channels: <
4% (max.), and
between ICs: <
6% (max.)
l
Output current adjusted through an external resistor
l
Constant output current range: 5 -120 mA
l
Fast response of output current, OE (min.): 400 ns
l
25MHz clock frequency
l
Schmitt trigger input
l
5V supply voltage
Current Accuracy
Between Channels
Between ICs
Conditions
<
4%
<
6%
I
OUT
= 10 mA to 60 mA, V
DS
= 0.6V
<
6%
<
12%
I
OUT
= 60 mA to100 mA, V
DS
= 0.8V
MBI5001CD
MBI5001CN
MBI5169CN
MBI5169CP
MBI5169CD
DIP16-P-300-2.54 Weight: 1.02g(typ)
SOP16-P-150-1.27 Weight: 0.13g(typ)
SSOP16-P-150-0.64 Weight: 0.07g(typ)
MBI5169 8-bit Constant Current LED Sink Driver with Error Detection
May
2003, V0.1
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Product Description
MBI5169 succeeds MBI5168 and is designed for LED displays with open-circuit Error Detection
extension. MBI5169 exploits PrecisionDrive
TM
technology to enhance its output characteristics.
MBI5169 contains a serial buffer and data latches, which convert serial input data into parallel
output format. At MBI5169 output stage, eight regulated current ports are designed to provide
uniform and constant current sinks for driving LEDs within a wide range of Vf variations.
While MBI5169 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 120 mA through an external resistor, R
ext
, which gives users flexibility in
controlling the light intensity of LEDs. MBI5169 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.
MBI5169 exploits the idea of Share-I-O
TM
technology to extend its performance
in addition,
MBI5169 is backward compatible with MBI5168 in both electrical characteristics and package
aspect. With Share-I-O
TM
technology, users can, without changing the printed circuit board
originally for MBI5168, let MBI5169 enter a special function mode, an Error Detection mode, just
by setting a sequence of signals on LE(ED1),
OE
(ED2) and CLK input pins. In the Error
Detection mode, MBI5169 detects the status of individual LED connected to MBI5169. 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),
OE
(ED2) and CLK input pins, MBI5169 may resume
to a Normal mode and perform as MBI5168. In Application Information, users can get detailed
ideas about how MBI5169 works in the Error Detection mode.
A Share-I-O
TM
technique is specifically applied to MBI5169. By means of the Share-I-O
TM
technique, an additionally effective function, Error Detection, can be added to LED drivers,
however, without any extra pins. Thus, MBI5169 could be a drop-in replacement of MBI5168.
The printed circuit board originally designed for MBI5168 may be also applicable for MBI5169.
For MBI5169, the pin 4, LE(ED1), and the pin 13,
OE
(ED2), can be acted as different functions
as follows:
MBI5169
Function Description of Pin 4
LE + Error Detection (ED1)
Function Description of Pin 13
OE + Error Detection (ED2)
Device Name
Pin
MBI5169 8-bit Constant Current LED Sink Driver with Error Detection
May
2003, V0.1
- 3 -
Terminal Description
Block Diagram
PIN NO.
PIN NAME
FUNCTION
1
GND
Ground terminal for control logic and current
sink
2
SDI
Serial-data input to the Shift Register
3
CLK
Clock input terminal for data shift on rising
edge
4
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)
5-12
OUT0 ~
7
OUT Constant current output terminals
13
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)
14
SDO
Serial-data output to the following SDI of next
driver IC
15
R-EXT
Input terminal used to connect an external
resistor for setting up all output current
16
VDD
5V supply voltage terminal
Pin Description
8-Bit Shift Register
8-Bit Output Latch
I
O
Regulator
Output Driver & Error Detector
Control Logic
R-EXT
SDI
CLK
SDO
8
8
GND
VDD
OE(ED2)
LE(ED1)
OUT1
OUT6 OUT7
OUT0
8
9
10
11
12
13
14
15
16
SDO
R-EXT
VDD
OE (ED2)
5
OUT
4
OUT
6
OUT
7
OUT
1
2
3
4
5
6
7
8
0
OUT
3
OUT
2
OUT
1
OUT
CLK
LE(ED1)
SDI
GND
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