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NCP1840
Control Bits
The NCP1840 has 3 control bits that are used to dictate the
function that will be performed by the part. The following
CONTROL BITS DESCRIPTION
table contains a description of each of these functions along
with their dependencies on the register address, A[4:0], and
the data byte, D[7:0].
CB2
0
0
0
0
1
1
1
1
CB1
0
0
1
1
0
0
1
1
CB0
0
1
0
1
0
1
0
1
Function
Turn all LED Channels ON/OFF
All channels are turned ON/OFF according to the data in the Output Control Register. The current and PWM
duty cycle will depend on each channel’s Current Level and PWM Register. The register address field, A[4:0],
is ignored along with the data byte, D[7:0]. The Master can issue a STOP condition without sending a data
byte.
Program a Single Register (also Read Operation Setting)
The register address, A[4:0], defines the register to be written or read. For a write, the data byte, D[7:0],
defines the data to be written. The data will be loaded in the register but will not take effect until either a 000 or
010 Control Bit setting is applied. This is also the Control Bit setting required for a Read operation (see Read
Protocol).
Program a Single Register and Turn all LED Channels ON/OFF
The register address, A[4:0], defines the register to be written to and the data byte, D[7:0], defines the data to
be written. After the receipt of the data byte, all channels will be turned ON/OFF according to the data in the
Output Control Register. The current and PWM duty cycle will depend on each channel’s Current Level and
PWM Register.
Program all 8 Current Level Registers
All Current Level Registers will be loaded with the data defined by the data byte, D[7:0]. The register address,
A[4:0], is ignored. The data will be loaded in the registers but will not take effect until either a 000 or 010 Con-
trol Bit setting is applied.
Program all 8 PWM Registers
All PWM Registers will be loaded with the data defined by the data byte, D[7:0]. The register address, A[4:0],
is ignored. The data will be loaded in the registers but will not take effect until either a 000 or 010 Control Bit
setting is applied.
Reserved
Reserved
Reserved
Register Address Map
The NCP1840 has a total of 18 different register
addresses, as shown in the table below, made up of the
following: 8 addresses for the individual channel Current
Level Registers, 8 addresses for the individual channel
PWM Registers, 1 address for the Output Control Register,
and 1 address for the Main Status Register. The 8 Current
REGISTER ADDRESS MAP
Address ? Binary
Level Registers are used to program the output current for
each of the 8 channels. The 8 PWM Registers are used to
program the PWM duty cycle for each of the 8 channels. The
Output Control Register is used to set the status, either ON
or OFF, of all 8 channels. The Main Status Register is used
to indicate the operating condition of the part: normal
operation, low power mode, or over temperature.
A4
0
0
0
0
0
0
0
0
0
0
A3
0
0
0
0
0
0
0
0
1
1
A2
0
0
0
0
1
1
1
1
0
0
A1
0
0
1
1
0
0
1
1
0
0
A0
0
1
0
1
0
1
0
1
0
1
Address ? Hex
0
1
2
3
4
5
6
7
8
9
Function
LED1 Current Level Register
LED2 Current Level Register
LED3 Current Level Register
LED4 Current Level Register
LED5 Current Level Register
LED6 Current Level Register
LED7 Current Level Register
LED8 Current Level Register
LED1 PWM Register
LED2 PWM Register
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