FEDL9213-01
1
Semiconductor
ML9213
FUNCTIONAL DESCRIPTION
Power-on Reset
When power is turned on, the ML9213 is initialized by the internal power-on reset circuit.
The status of the internal circuit after initialization is as follows:
N The contents of the shift registers and latches are set to “0”.
N The anode dimming duty cycle is set to “0”.
N All segment outputs (SEG1 to 56) are set to Low level.
N The GRID1 output is set to Low level.
N The GRID2 and GRID3 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 anode 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 anode dimming data succeedingly.
When the chip select input falls, an internal LOAD signal is automatically generated and data is loaded to the
latches.
Set the shift clock to a High level except during data transfer.
CS
CLOCK
M0 M1 M2
Mode data
DATA IN
Segment data or dimming data
Function Mode
Function mode is selected by the mode data (M0 to M2). The relation between function mode and mode data is as
follows:
MODE 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
10/19
OKI [ OKI ELECTRONIC COMPONETS ]
