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
Preliminary Datasheet
MBI5170
8-bit Constant Current LED Sink Driver
with Gain Control
OE
Features
l
8 constant-current output channels
l
Output current adjustable through an external resistor
l
Output current gain programmable for White Balance
l
Constant output current range: 5 -120 mA
l
Excellent output current accuracy,
between channels <
4% (max.), and
between ICs <
6% (max.).
l
Constant output current invariant to load voltage change
l
Fast response of output current, (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
MBI5001CN
MBI5170CN
DIP16-P-300-2.54 Weight: 1.02g(typ)
MBI5001CD
MBI5170CD
SOP16-P-150-1.27 Weight: 0.13g(typ)
MBI5170CP
SSOP16-P-150-0.64 Weight: 0.07g(typ)
MBI5170 8-bit Constant Current LED Sink Driver with Gain Control
May 2003, V0.1
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Product Description
MBI5170 succeeds MBI5168 and is designed for LED displays with Gain Control extension.
MBI5170 exploits PrecisionDrive
TM
technology to enhance its output characteristics. MBI5170
contains a serial buffer and data latches, which convert serial input data into parallel output
format. At MBI5170 output stage, eight regulated current ports are designed to provide constant
current sinks for driving LEDs within a wide range of Vf variations.
MBI5170 provides users with great flexibility and device performance while using MBI5170 in
their LED panel system design. 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. MBI5170 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.
MBI5170 also exploits Share-I-O
TM
technology and is backward compatible with MBI5168 in
both electrical characteristics and package aspect. To utilize the Current Adjust feature with
Share-I-O
TM
technology, users may not need to change the printed circuit board originally for
MBI5168. To enter a special function mode- Current Adjust mode, users just need to set a
sequence of signals on LE(CA1),
OE
(CA2) and CLK input pins. Normally, the output current
can be regulated only through an external resistor. In addition, in the Current Adjust mode, the
output current can be software-programmable by a system controller. The system controller
adjusts the output current by sending a 7-bit Current Adjust code to 8-bit Configuration Latch
through MBI5170 SDI pin. The code will be latched and effective to control the output current
regulator. A fine adjustment of the output current could be achieved by a gain ranging from 0.5
to 2 with 128 fine steps. By setting another sequence of signals on LE(CA1),
OE
(CA2) and
CLK input pins, MBI5170 may resume to a Normal mode and perform as MBI5168. The Shift
Register, with SDI, SDO, and CLK, carries the image data as usual.
A Share-I-O
TM
technique is specifically applied to MBI5170. By means of the Share-I-O
TM
technique, an additionally effective function, Current Gain, can be added to LED drivers,
however, without any extra pins. Thus, MBI5170 could be a drop-in replacement of MBI5168.
The printed circuit board originally designed for MBI5168 may be also applicable for MBI5170.
For MBI5170, the pin 4, LE(CA1), and the pin 21, OE (CA2), can be acted as different functions
as follows:
MBI5170
Function Description of Pin 4
LE + Error Detection (CA1)
Function Description of Pin 13
OE
+ Error Detection (CA2)
Device Name
Pin
MBI5170 8-bit Constant Current LED Sink Driver with Gain Control
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(CA1)
Data strobe input terminal
Serial data is transferred to the respective
latch when LE(CA1) is high. The data is
latched when LE(CA1) goes low.
Also, a control signal input for Current
Adjust mode (See Timing Diagram)
5-12
OUT0 ~
7
OUT Constant current output terminals
13
OE (CA2)
Output enable terminal
When (active) low, the output drivers are
enabled; when high, all output drivers are
turned OFF (blanked).
Also, a second control signal input for
Current Adjust 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
resister for setting up all output current
16
VDD
5V supply voltage terminal
Pin Description
LE(CA1)
9
10
11
12
13
14
15
16
SDO
R-EXT
VDD
OE (CA2)
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
SDI
GND
LE(CA1)
8-Bit Shift Register
8-Bit Output Latch
8-Bit Configuration Latch
I
O
Regulator
8-Bit Output Driver
Control Logic
R-EXT
SDI
CLK
SDO
8
8
8
7
GND
VDD
OUT0
1
OUT
OUT6
OUT7
(CA2)
OE
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