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NCP5890
SCL
B7 B6 B5 B4 B3 B2 B1 B0 ACK B7 B6 B5 B4 B3 B2 B1 B0 ACK B7 B6 B5 B4 B3 B2 B1 B0 ACK
SDA
Start Conditions
I2C Address
Register Selection
Figure 7. Single Frame I2C Sequence
DATA
Stop conditions
SCL
SDA
I2C Address
Register Selection
DATA Register
N sequences
Register Selection
DATA Register
Figure 8. Multi Frames I2C Sequence
On the other hand, although the chip does not handle the
Read operation, care must be observed since sending a
Read command ($73 or $75) is equivalent to a Write
command and the selected register will be updated
accordingly.
Registers Setup Selection
The Register Selection follows the I2C address of a new
frame and must be followed by the DATA Register. The
content of the Register Selection byte is not stored into the
chip and a new one must be sent for every DATA upload.
Table 2. Register Selection
The last code $0F is reserved for ON Semiconductor to
control the manufacturing test and access to this register is not
permitted outside the ON Semiconductor final test facilities.
Shutdown and True Cut ? off
To shutdown the device the user must write $00 in
Register Selection. When in shutdown condition, FB pin is
turned in impedance and truly isolates the load from the
battery. The NCP5980 is immediately turn on when one of
the Register Selection from $01 to $0F is active to point a
given DATA Register.
Register Functions
Shutdown the chip
Select I ? LED current setup and immediate LED update
Select I ? LED target Gradual Dimming command UP
Select I ? LED target Gradual Dimming command DOWN
Set Timing & Start gradual Dimming Sequence
Select PWM0 register
Select PWM1 register
Select PWM2 register
Set up Photo sense input stage gain
Set up Photo Sense I ? LED minimum value
Set up Photo Sense timing
RFU
RFU
RFU
RFU
Reserved for manufacturing test: do not access
ILED Current
Register
SDN
ILEDREG[4..0]
GDIM ? UP[4..0]
GDIM ? DWN[4..0]
TDIM[4..0]
PWM0[4..0]
PWM1[4..0]
PWM2[4..0]
PHGAIN[4..0]
PHMIN[3..0]
PHCLK[5..0]
FTEST[7..0]
Address
$00
$01
$02
$03
$04
$05
$06
$07
$08
$09
$0A
$0B
$0C
$0D
$0E
$0F
The ILED current depends upon the reference current
(I REF pin ) and the digital contents of the ILEDREG
register. The I2C port is used to program the ILED current
by writing to the ILEDREG register. The load current is
derived from the 1144 mV reference voltage associated to
the external resistor connected across I REF pin and Ground
(see Figure 9). The maximum ILED current is given by the
internal current mirror ratio (multiplier ? k ? ) equal to 250.
range (ILEDREG = $1F), the reference current should be
25 mA/250 = 100 m A. This current is used to calculate the
resistor connected between the IREF pin and GND: R REF
= 1.144 / 100e ? 6 = 11.44 k W . In any case, no voltage shall
be forced at I REF pin, either downward or upward.
The tolerance of the external resistor must be 1% or
better, with a 100 ppm thermal coefficient, to get the
expected overall tolerance.
In other words, to get a 25 mA maximum, with a 100% full
http://onsemi.com
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