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AP4201 Datasheet(PDF) 3 Page - Asahi Kasei Microsystems

Part # AP4201
Description  27ch 100mA LED Driver IC
PDF  27 Pages
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Manufacturer  AKM [Asahi Kasei Microsystems]
Direct Link  http://www.akm.com
Logo AKM - Asahi Kasei Microsystems

AP4201 Datasheet(HTML) 3 Page - Asahi Kasei Microsystems

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[AP4201]
015008157-E-00
- 3 -
2015/09
4.
Block Diagram and Functions
■ Block Diagram
UVLO
LDO1
5.0V
VIN
VDC1
THERMAL
SHUTDOWN
VREF
LEDR0
IREF
POR
1.4MHz
OSC
2-bit
DIVIDER
8-bit
COUNTER
216-bit
REGISTER
CONTROL
LOGIC
SCI
INTERFACE
PWM
GENERATOR 0
PWM
GENERATOR 0
PWM
GENERATOR 0
PWM
GENERATOR 26
CSB/LAT
SCK/CLK
TxD/SI
RxD/SO
5.0V
LEDG0
LEDB8
27
EN
EN
TSD
A0
A1
A2
A3/CLRB
GND
PGND
A4/ENB
SCIFEN
SCIEN
ISET_R
VDC
LOW SIDE
CURRENT
SINK
Constant Current
or
Open Drain
1.0V
LEDB0
LEDR1
LEDG1
LEDB1
ISET_G
ISET_B
5.0V
DRSET
DRSET
1.0
mF
1.0
mF
RISET_R
RISET_G
RISET_B
PWMSET
PWM
PWM
VDC2
1.0
mF
1.8V
LDO2
VIN
Figure 1.Block Diagram
■ Function
No
Block
Function
1
SCI
INTERFACE
In case of SCI: hold the setting data of the PWM gradation.
In case of serial F/F: hold the PWM gradation data.
2
CONTROL
LOGIC
Detect SCI instruction, control the operation mode.
3
“216-bit”
REGISTER
Hold the 8-bit PWM gradation data of LEDR0~8, LEDG0~8 and LEDB0~8.
4
PWM
GENERATOR
Compare PWM gradation with counter and generate PWM wave.
5
1.4MHz OSC
Generate 1.4MHz clock.
6
“2-bit” DIVIDER Divide 1.4MHz clock to 256 gradation clock.
7 “8-bit” COUNTER Count with the 256 gradation clock within PWM period.
8
UVLO
Generate reset signal for preventing unstable operating when input power voltage.
decreased.
9
LDO1
Generate an internal 5 voltage. It can supply less than 30mA for driving external
circuit.
10
LDO2
Generate an internal 1.8 voltage. Driving external circuit is forbidden.
11
VREF
Generate a reference voltage.
12
IREF
Generate a reference current.
13
POR
Generate reset signal at power start up.
14
LOW SIDE
CURRENT SINK
LED output driver which can set to current source or open drain output.
Over current protection circuit is built in.
15
THERMAL
SHUTDOWN
Shut down the LED current and set the VDC1,VDC2 pins to 0 voltage when
internal temperature is more than setting value.



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