ncp1840 ON Semiconductor, ncp1840 Datasheet - Page 4

• Manufacturer Part Number: ncp1840
• Description: High Current, 8-output Led Driver
• Manufacturer: ON Semiconductor

4. All LED outputs off, Charge Pump in 1X Mode, no I
5. With external R_IDAC = 10.25 kW.
6. Part enters Low Power Mode around 5 ms after all LED outputs are “off” and there is no I
7. For T = −40°C max LED−to−LED matching limit is 7.5%.
I
I
interface is 400 kHz. I
2
2
OPERATING RANGES
WRITE PROTOCOL USED BY NCP1840:
1
S
READ PROTOCOL USED BY NCP1840:
1
S
C INTERFACE
C frame. The NCP1840 is a slave only part, data can be written to or read from the part. The max speed clock for the serial
S = Start Condition, W = Write, A = Acknowledge, P = Stop Condition
S = Start Condition, W = Write, R = Read, A = Acknowledge, A =No Acknowledge, P = Stop Condition
The NCP1840 is programmed through an I
I
I
VBATT−LOQ
resumes normal operation in less than 1 ms.
DVCC−LOQ
Symbol
I
LED
I
I
DV
I
LED
VBATT
V
DVCC
Part Address
T
V
BAT
(31)
A
CC
f
(0)
S T AR T
Part Address
7
0
7
1
LED forward voltage
Battery operating voltage
Digital Supply Voltage
Digital Supply Current
Digital Supply Current – Low Power Mode
Battery Supply Current
Battery Supply Current – Low Power Mode
Full−Scale LED Current
Minimum LED Current
LED−to−LED Matching
Ambient Temperature
0
2
1
W
1
Part Address
2
3
C pins SCL and SDA require external pull-up resistors around 1.3 kW.
1
1
A
4
0
W
1
5
Control Bits
1
6
1
A
3
1
7
WRI TE
Control Bits
0 AC K CB2 CB1 CB0
8
Parameter
9
3
2
C interface. The communication takes place with serial bytes sharing the same
Co nt r o l B i t s
1
2
C Communication.
2
http://onsemi.com
3
Register
Address
Figure 2.
A4
4
5
Re gi s t e r Addr e s s
A3
4
5
Register Address
A2
6
A1
7
1
A
5
A0
8
8
S
AC K B7
9
Part Address
0.81
Min
450
−40
3.3
3.3
2.0
0.5
0.4
28
1
B6
2
2
7
C communication. Communication to the part
B5
3
3.42
3.42
2.35
0.85
Typ
520
Register Data
< 1
< 1
30
27
4
B4
4
A3
1
R
5
A2
Max
3.10
34.5
0.95
750
6
4.1
5.5
3.6
3.5
6.9
1
A
1
A
85
2
A1
7
A0
Data Out
Register
Register
8
Units
Data
mA
mA
mA
AC K
mA
mA
mA
°C
%
V
V
V
8
8
9
S TOP
(Note 4)
(Note 6)
(Note 4)
(Note 6)
(Note 5)
(Note 5)
(Note 7)
Notes
A
A
1
1
1
P
1
P