參數(shù)資料
型號(hào)： MBI5170
廠商： Electronic Theatre Controls, Inc.
英文描述： 8-Bit Constant Current LED Sink Driver with Gain Control
中文描述： 8位恒流增益控制LED驅(qū)動(dòng)器
文件頁(yè)數(shù)： 17/24頁(yè)
文件大小： 400K
代理商： MBI5170
MBI5170 8-Bit Constant Current LED Sink Driver with Gain Control
Operation Phases
MBI5170 exploits the
Share-I-O
technique to extend the functionality of pins in MBI5168 in order to provide
run-time programmable LED driving current in the Current Adjust Mode phase as well as the original function of
MBI5168 in the Normal Mode phase. In order to switch between the two modes, MBI5170 monitors the signal
OE /SW. Once a one-clock-wide pulse of OE /SW appears, MBI5170 would enter the two-clock-period transition
phase---the Mode Switching phase. After power-on, the default operation mode is the Normal Mode.
Operation Mode Switching
August 2004, VA.00
- 17 -
As shown in the above figures, once a one-clock-wide short pulse
“
101
”
of OE /SW appears, MBI5170 would enter
the Mode Switching phase. At the 4
th
rising edge of CLK, if LE/MOD/CA is sampled as
“
Voltage High
”
, MBI5170
would switch to the Current Adjust Mode; otherwise, it would switch to the Normal Mode. Worthwhile noticing, the
signal LE/MOD/CA between the 3
rd
and the 5
th
rising edges of CLK can not latch any data. Its level is just used for
determining which mode to switch. However, the short pulse of OE /SW can still enable the output ports. During
the mode switching, the serial data can still be transferred through the pin SDI and shifted out from the pin SDO.
Note:
1. The signal sequence for the mode switching could be frequently used for making sure under which mode
MBI5170 is working.
2. The aforementioned
“
1
”
and
“
0
”
are sampled at the rising edge of CLK. The
“
X
”
means its level would not affect
the result of mode switching mechanism.
Normal Mode Phase
MBI5170 in the Normal Mode phase has similar functionality to MBI5168. The only difference is short pulse
OE /SW signal monitoring. The short pulse would trigger MBI5170 to switch its operation mode. However, as long
as the signal LE/MOD/CA is not Voltage High in the Mode Switching phase, MBI5170 would still remain in the
Normal Mode as if no mode switching occurs.
Switching to the Current Adjust Mode
LE/MOD/CA
CLK
1 2
3 4 5
1
0 1
x
x
x
x
x 1
x
Voltage High
Phase
Mode
Switching
Current Adjust
Mode
Current Adjust Mode
or Normal Mode
OE /SW
Switching to the Normal Mode
1 2
LE/MOD/CA
CLK
3 4 5
1
0 1
x
x
x
x
x 0
x
Voltage Low
Phase
Mode
Switching
Normal
Mode
Current Adjust Mode
or Normal Mode
OE /SW
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