¡ Semiconductor
ML9211
FUNCTIONAL DESCRIPTION
Power-on Reset
When power is turned on, the ML9211 is initialized by the internal power-on reset circuit.
The status of the internal circuit after initialization is as follows:
• The contents of the shift registers and latches are set to "0".
• The digital dimming duty cycle is set to "0".
• All segment outputs are set to Low level.
• All grid outputs are set to High level.
Data Transfer Method
Data can be transferred between the rising edge and the next falling edge of chip select input.
The mode data, segment data and dimming data are written by a serial transfer method. The
serial data is input to the shift register at the rising edge of a shift clock pulse.
The mode data (M0 to M2) must be transferred after the segment data and dimming data
succeedingly.
When the chip select input falls, an internal LOAD signal is automatically generated and data is
loaded to the latches.
Function Mode
Functionmodeisselectedbythemodedata(M0toM2). Therelationbetweenfunctionmodeand
mode data is as follows:
FUNCTION DATA
FUNCTION MODE
OPERATING MODE
M0
0
M1
0
M2
0
0
1
2
3
4
Segment Data for GRID1-3 Input
Segment Data for GRID1 Input
Segment Data for GRID2 Input
Segment Data for GRID3 Input
Digital Dimming Data Input
1
0
0
0
1
0
1
1
0
0
0
1
Segment Data Input [Function Mode: 0 to 3]
• ML9211 receives the segment data when function mode 0 to 3 are selected.
• The same segment data is transferred to the 3 segment data latches corresponding to GRID 1
to 3 at the same time when the function mode 0 is selected.
• The segment data is transferred to only one segment data latch corresponding to the specified
GRID when the function mode is 1, 2 or 3 is selected.
• Segment output (SEG1 to 56) becomes High level (lighting) when the segment data (S1 to S56)
is set to "1".
[Data Format]
Input Data
: 59 bits
Segment Data : 56 bits
Mode Data
:
3 bits
Bit
Input Data
1
2
3
4
53
54
55
56
57
58
59
S1 S2 S3 S4
Segment Data (56bits)
S53 S54 S55 S56 M0 M1 M2
Mode Data
(3bits)
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