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NCP1840
Step 4a. Set LEDs 1, 2, 3, 4, 8 to be ON and immediately activate the change with settings loaded in Steps 1 ? 3.
4a.1 Set the Part Address to 1B (hex).
4a.2 Set the Read/Write bit to 0.
4a.3 Set the Control Bits to 010 and set the Register address to 10 (hex) to write to the Output Control Register.
4a.4 Set the Data to 8F (hex), which will set LEDs 1, 2, 3, 4, 8 to be ON.
Note: After this step the LEDs will immediately be activated with the current level and PWM duty cycle settings previously
loaded.
Control
Start
S
Part Address
0011011
R/W
0
Ack
A
Bits
010
Register Address
10000
Ack
A
Register Data
10001111
Ack
A
Stop
P
Step 4b. (Alternative to Step 4a.) Set LEDs 1, 2, 3, 4, 8 to be ON and later activate the change with settings loaded in Steps
1 ? 3.
4b.1 Set the Part Address to 1B (hex).
4b.2 Set the Read/Write bit to 0.
4b.3 Set the Control Bits to 001 and set the Register address to 10 (hex) to write to the Output Control Register.
4b.4 Set the Data to 8F (hex), which will set LEDs 1, 2, 3, 4, 8 to be ON.
Note: After this step the LEDs will not be activated until either a 000 or 010 Control Bit setting is applied ? see further 4b steps.
Control
Start
S
Part Address
0011011
R/W
0
Ack
A
Bits
001
Register Address
10000
Ack
A
Register Data
10001111
Ack
A
Stop
P
4b.5 Set the Part Address to 1B (hex).
4b.6 Set the Read/Write bit to 0.
4b.7 Set the Control Bits to 000.
Note: After this step the LEDs will immediately be activated with the current level and PWM duty cycle settings previously
loaded.
Control
Start
S
Part Address
0011011
R/W
0
Ack
A
Bits
000
Register Address
Don’t Care
Ack
A
Stop
P
Step 5. Turn OFF LED8, leaving LEDs 1, 2, 3, 4 ON.
5.1 Set the Part Address to 1B (hex).
5.2 Set the Read/Write bit to 0.
5.3 Set the Control Bits to 010 and set the Register address to 10 (hex) to write to the Output Control Register.
5.4 Set the Data to 0F (hex), which will set LED8 OFF and leave LEDs 1, 2, 3, 4 ON.
Control
Start
S
Part Address
0011011
R/W
0
Ack
A
Bits
010
Register Address
10000
Ack
A
Register Data
00001111
Ack
A
Stop
P
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