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16-Bit Constant Current LED Sink Driver with
LED Error Detection and Run-Time Current Adjustment
April 2005, VA.02
- 7 -
MBI5029
Switching to Special Mode
The above shows an example of the signal sequence that can set the next operation mode of MBI5029 to be the
Special Mode. The LE/MOD/CA active pulse here would not latch any serial data.
Note:
After entering the Special Mode, MBI5029 can detect LED error and adjust current gain.
Writing Configuration Code (In Special Mode)
In the Special Mode, by sending the positive pulse of LE/MOD/CA, the content of the Shift Register with a
Configuration Code will be written to the 16-bit Configuration Latch.
Reading Error Status Code (In Special Mode)
When MBI5029 is working in the Special Mode, the above signal sequence example can let a system controller
read the Error Status codes via the pin SDO.
LE/MOD/CA
CLK
1
2
3
4
5
1
0
1
1
1
0
0
0
1
0
ED
/SW/
OE
: don’t care
Bit14
Error Status Code
Bit13 Bit12 Bit11
CLK
SDO
ED
/SW/
OE
Bit15
At least 2 µs
N = 0
1
2
3
4
5
12
13
14
15
Bit15 Bit14 Bit13 Bit12 Bit11
Bit3
Bit2
Bit1
Bit0
CLK
LE/MOD/CA
SDI
Bit10
16-Bit Configuration Code
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