NCP1840Q8A6MNG ON Semiconductor, NCP1840Q8A6MNG Datasheet - Page 17

• Manufacturer Part Number: NCP1840Q8A6MNG
• Description: LED Lighting Drivers PRGRM MULTI LED DRIVER
• Manufacturer: ON Semiconductor

Specifications of NCP1840Q8A6MNG

• Product Category: LED Lighting Drivers
• Rohs: yes
• Input Voltage: 3 V to 5.5 V
• Operating Frequency: 400 kHz
• Maximum Supply Current: 0.75 mA
• Output Current: 30 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-20
• Minimum Operating Temperature: - 40 C

Step 6. Read back the LED1 PWM Register value.
Some key layout guidelines are as follows:
6.1 Set the part address to 1B (hex).
6.2 Set the Read/Write bit to 0.
6.3 Set the Controls Bits to 001 in order to perform a Read operation.
6.4 Set the Register Address to 08 (hex) in order to read LED1 PWM Register.
6.5 Issue another Start and set the part address to 1B (hex).
6.6 Set the Read/Write bit to 1.
Note: After this step, the NCP1840 will transmit the LED1 PWM Register data byte which should be 20 (hex).
Start
1. The NCP1840 requires a low−inductance ground.
2. Connect Pin 6 and Pin 15 to the “ground pad” of the NCP1840’s package − see Figure 15.
3. Place vias on the “ground pad,” connecting the GND of the NCP1840 directly to the PCB ground plane − see
S
Figure 15.
0011011
Part Ad-
dress
R/W
0
Ack
A
Control
Figure 15. Ground Connection Recommendation
001
Bits
Register
Address Ack Start
01000
LAYOUT CONSIDERATIONS
http://onsemi.com
A
17
S
Part Address
0011011
R/W
1
Ack
A
Data Out
Register
Data
notA
Ack
Stop
P