AP4201 datasheet(5/27 Pages) AKM

5 / 27 page

[AP4201]

015008157-E-00

- 5 -

2015/09

■ Function

No.

Name

Equivalent circuit

Explanation

A3/CLRB

VDC1

IC address input pin 3 (built in 100k ohm pull-up resistor).

Configure by connecting to GND or open.

CLRB input pin used for serial F/F.

Data clear pin used for shift register.

A4/ENB

VDC1

IC address input pin 4 (built in 100 k ohm pull-up resistor).

Configure by connecting to GND or open.

ENB input pin used for serial F/F.

Control the shift resister data which reflect to PWM data

or not.

CSB/LAT

VDC1

Strobe signal input pin for SCI.

Respective orders are accepted when the CSB terminal

goes “L” level. The CSB terminal always needs to be “L”

level while commands are entered or data are transferred.

If the CSB pin goes “H” level when data are transferred,

the commands are disregarded.

LAT signal input pin used for serial F/F.

Input LAT signal for shift register.

SCK/CLK

VDC1

Clock signal input for SCI.

Writing data is entered from the TxD pin at the SCK rising

edge, reading data is output to RxD pin at the SCK falling

edge. It is not always necessary to supply a clock signal to

the SCK pin.

CLK signal input pin used for serial F/F.

CLK signal for shift register.

TxD/SI

VDC1

Data signal input pin.

To input commands, writing data.

SI input pin for serial F/F.

To input data signal of shift register.

Input to F/F which determine LEDB0 lighting data.

RxD/SO

VDC1

Data signal output pin for SCI.

To output reading data.

Outputs Hi-Z except when data is output.

SO output pin for serial F/F.

To output data signal of shift register.

Output from F/F which determine LEDR8 lighting data.

DRSET

VDC1

Switching pin which can switch to driver output current

source or open drain (100kohm pull up)

Connect to GND or set to open.

If connect to GND, it can work as open drain mode.

SCIEN

VDC1

Enable pin for serial interface. (100kohm pull up)

Connect to GND or set to open.

If connect to GND, it can work as serial F/F control mode.

If open this pin, it can work as SCI control mode.

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